taxonID	type	description	language	source
03CD87F52B65FFA926F1F95AFBE28381.taxon	materials_examined	Type genus. Syllis Savigny in Lamarck, 1818.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B65FFA926F1F95AFBE28381.taxon	diagnosis	Diagnosis. Small sized polychaetes, with nearly cylindrical to strongly dorso-ventrally flattened bodies. Palps well developed, from completely free from each other to completely fused. Prostomium typically with 2 pairs of eyes, sometimes also with 1 pair of anterior eyespots, and 3 antennae. Peristomium with 1 – 2 pairs of peristomial cirri. Smooth to articulated dorsal cirri, usually longer on anterior chaetigers; ventral cirri usually present, shorter than dorsal cirri. Compound chaetae as falcigers; modified falcigers frequently present as spiniger-like chaetae or, more rarely, secondarily simple due to loss of blade or fusion to shaft; falciger blades unidentate or bidentate, distal teeth of variable sizes. Dorsal and ventral simple chaetae usually present, at least on posterior chaetigers. One to many aciculae of variable morphologies per parapodium, typically progressively fewer and stouter posteriorwards. Pygidium with 1 pair of anal cirri, usually longer than posterior dorsal cirri. Straight to sinuous pharynx on anterior segments, usually with anterior margin surrounded by papillae and central tooth and / or trepan; some species with unarmed pharynx; pharynx followed by muscular proventricle of variable size. Reproduction by epigamy or schizogamy, sometimes with incubation of eggs and embryos; a few species viviparous.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B66FFA926F1FDD8FF68869E.taxon	materials_examined	Type species. Exogone naidina Ørsted, 1845.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B66FFA926F1FDD8FF68869E.taxon	diagnosis	Diagnosis. Body short, slender. Palps well developed, completely or almost completely fused. Prostomium with 2 pairs of eyes, sometimes also with 1 pair of anterior eyespots, and 3 antennae. Peristomium with 1 pair of short, papilliform or ovate peristomial cirri. Compound chaetae as falcigers and, frequently, spiniger-like chaetae; falciger blades usually bidentate, subdistal tooth larger, blades partially fused to shafts or absent in some species; shafts of spiniger-like chaetae with triangular processes in some species. Dorsal simple chaetae present from anterior chaetigers, ventral simple chaetae usually only on posterior chaetigers. Aciculae commonly inflated distally, frequently hollow, with slightly curved tip. Pygidium with 1 pair of anal cirri, usually longer than dorsal cirri. Reproduction by epigamy, with ventral incubation of eggs and embryos.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B66FFA926F1FDD8FF68869E.taxon	discussion	Remarks. The genus Exogone was revised by San Martín (1991) who established 3 sub-genera: Parexogone Mesnil & Caullery, 1918, Exogone Ørsted, 1845 and Sylline Claparède, 1864. Böggemann & Westheide (2004) raised Parexogone to the generic level, and recent studies on the Syllidae have abandoned the subgenera classification, considering Exogone as monophyletic and not recognizing E. (Exogone) and E. (Sylline) as separate subgenera (Aguado & San Martín 2009; Aguado et al. 2012, Paresque et al. 2014). This classification is followed herein.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B66FFAE26F1FB1CFB44863C.taxon	materials_examined	Material examined. Project ' Oceanprof '. 22 ° 02 ’ 50.81 ” S, 39 ° 52 ’ 24.10 ” W, 0 – 2 cm, 1050 m deep: 1 spec. (MNRJP 1151), 14 Dec 2002; 22 ° 27 ’ 31.1 ” S, 40 ° 09 ’ 23.5 ” W, 0 – 2 cm, 749 m deep: 1 spec. (MNRJP 1152), 18 Jun 2003. Project ‘ Habitats ’. 21 ° 22 ’ 58 ” S, 40 ° 19 ’ 44 ” W, 53 m deep: 1 spec., 21 Jul 2009; 21 ° 42 ’ 53 ” S, 40 ° 10 ’ 16 ” W, 98 m deep: 1 spec. (MZUSP 2905), 9 Mar 2009, and 1 spec., 7 Jul 2009; 22 ° 17 ’ 42 ” S, 40 ° 26 ’ 59 ” W, 104 m deep: 1 spec., 23 Feb 2009, and 3 specs (MZUSP 2908), 4 Jul 2009; 22 ° 23 ’ 22 ” S, 40 ° 34 ’ 59 ” W, 110 m: 1 spec. (MZUSP 2909), 25 Jul 2009; 22 ° 46 ’ 54 ” S, 41 ° 3 ’ 33 ” W, 78 m deep: 1 spec., 22 Feb 2009, and 1 spec., 0 3 Jul 2009; 22 ° 52 ’ 1 ” S, 40 ° 57 ’ 29 ” W, 92 m deep: 1 spec., 22 Feb 2009, and 1 spec. (MZUSP 2907), 3 Jul 2009; 23 ° 10 ’ 5 ” S, 41 ° 3 ’ 6 ” W, 107 m deep: 2 specs (MZUSP 2906), 0 2 Jul 2009; 23 ° 11 ’ 28 ” S, 41 ° 0 ’ 49 ” W, 117 m deep: 1 spec. (MZUSP 2904), 21 Feb 2009. Project ‘ AMBES ’. 19 ° 33 ’ 20 ” S, 39 ° 2 ’ 36 ” W, 420 m deep: 1 spec. (MZUSP 2912), 11 Dec 2011; 19 ° 36 ’ 26 ” S, 39 ° 10 ’ 17 ” W, 392 m deep: 6 specs (MZUSP 2911), 14 Dec 2011; 19 ° 49 ’ 37 ” S, 39 ° 35 ’ 41 ” W, 410 m deep: 1 spec., 14 Jan 2012; 20 ° 14 ’ 19 ” S, 39 ° 48 ’ 36 ” W, 381 m deep: 1 spec. (MZUSP 2914), 9 Jan 2012, and 5 specs (MZUSP 2915), 19 Jun 2013; 20 ° 15 ’ 36 ” S, 39 ° 46 ’ 15 ” W, 1040 m deep: 1 spec. (MZUSP 2913), 9 Jan 2012; 20 ° 35 ’ 16 ” S, 39 ° 53 ’ 47 ” W, 410 m deep: 58 specs, 8 Jan 2012, and 27 specs, 18 Jun 2013; 20 ° 36 ’ 2 ” S, 39 ° 51 ’ 35 ” W, 1000 m deep: 18 specs, 8 Jan 2012; 21 ° 4 ’ 43 ” S, 40 ° 8 ’ 31 ” W, 1024 m deep: 3 specs, 30 Dec 2011. Additional material examined. Exogone anomalochaeta — Australia, Tasmania, Macquarie Island (54 ° 37 ' S, 158 ° 51 ' E): 17 specs (AM W 617, syntypes), coll. H. Hamilton, det. W. Benham. Antartic, South Shetland Islands, Livingston Island: 2 specs (MNCN 16.01 / 1517), coll. & det. G. San Martín, 0 7 Feb 1994; 24 specs (MNCN 16.01 / 1519), coll. & det. G. San Martín, 19 Feb 1994. Exogone heterosetosa — Australia, Western Australia, Goss Passage, north end of Long Island (28 ° 28 ' 18 " S, 113 ° 46 ' 18 " E), 8 m deep: 10 specs (AM W 27057), coll. C. Bryce, 22 May 1994, det. G. San Martín, 2000. Exogone tridentata — Antarctic, Antarctic Peninsula, close to Base General Bernardo O´Higgins Riquelme (63 ° 00.49 ' S, 57 ° 09.45 ' W), 97 m deep: 2 specs (ZMH P- 21218, holotype; ZMH P – 21219, paratype), coll. G. Hartmann, M. Siegel & G. Hartmann-Schröder, 1991, det. G. Hartmann-Schröder, 1992.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B66FFAE26F1FB1CFB44863C.taxon	description	Description. Longest specimen examined 3.0 mm long, 0.3 mm wide, with 35 chaetigers. Palps narrower than anterior chaetigers, almost totally fused, with distal notch. Prostomium ovate, shorter than palps, with two pairs of eyes in open trapezoidal arrangement, almost transversally in line (Fig. 1 A); antennae inserted close to each other, on middle of prostomium or slightly posteriorly; lateral antennae ovate, papilliform; median antenna digitiform, elongate, distally tapering, reaching around half length of palps (Fig. 2 A – B, D). Peristomium shorter than subsequent segments, sometimes covering posterior part of prostomium, including posterior pair of eyes; peristomial cirri minute, rounded to ovate. Dorsal cirri ovate, longer than peristomial cirri, slightly shorter than lateral antennae, absent on chaetiger 2 (Figs 1 A; 2 A – C). Ventral cirri similar to dorsal cirri but shorter (Fig. 2 C). Parapodial lobes conical (Fig 1 A; 2 A – C, G – I). Compound chaetae as falcigers only; anterior parapodia with 5 – 9 falcigers each, midbody with 4 – 5, posterior parapodia with 3 falcigers each; falcigers with distally swollen, spinulated shafts; blades small, with inverted dorso-ventral gradation in length, ~ 4 – 8 µm long along body, dorsalmost blades sometimes not reaching beyond tips of shafts (Fig. 2 F), blades bidentate and spinulated, distal tooth shorter (Figs 1 B – C; 2 F – I). Dorsal simple chaetae present on all parapodia, subdistally inflated, with slightly more sigmoid and more acute tip on posterior body chaetigers (Figs 1 E – F; 2 G – I); ventral simple chaetae only present on posterior body, smooth, bidentate, tips resembling those of blades of ventralmost falcigers, with distal tooth shorter (Fig. 1 G). Anterior parapodia with 2 aciculae each, aciculae distally inflated, with apparently hollow tip, one straight, other slightly bent distally (Fig. 1 D); from proventricle onwards, single acicula per parapodium, similar to anterior ones, progressively stouter (Fig. 1 H). Pygidium with 1 pair of elongate anal cirri, much longer than dorsal cirri and up to twice as long as median antenna. Pharynx through 3 chaetigers, tooth close to anterior border; proventricle extending for 3.5 – 5 chaetigers, with ca. 20 rows of muscle cells (Fig. 1 A).	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B66FFAE26F1FB1CFB44863C.taxon	discussion	Remarks. The specimens herein examined match the original description, except for the length of the proventricle, which is longer in Brazilian specimens (3.5 – 5 chaetigers, as opposed to 2 – 3 chaetigers, as in the original description). In addition, although not mentioned in the text of the original description, Benham illustrated a specimen with dorsal cirri on chaetiger 2 (Benham 1921: Pl. 5, Fig. 11), while in Brazilian specimens, dorsal cirri are absent on chaetiger 2. Both these differences, however, could not be confirmed in the specimens examined from other localities, including the syntypes, all specimens being remarkably similar to the Brazilian ones. Based on specimens from the Kerguelen Islands, Monro (1939) synonymized this species with E. heterosetosa McIntosh, 1885. However, based on the illustrations provided (Monro 1939: Fig. 9), all the material examined by Monro belongs to E. anomalochaeta and not to E. heterosetosa, which is a fairly different species (see San Martín 2005). Exogone heterosetosa differs from E. anomalochaeta by having the median antenna longer than the combined length of prostomium and palps, by having falcigers with proportionally larger blades, and also by having spiniger-like compound chaetae, which are absent in E. anomalochaeta. So, we consider both E. anomalochaeta and E. heterosetosa as valid species. The type series of E. tridentata was also examined, but we could not find significant differences to E. anomalochaeta. Thus, E. tridentata is herein considered as a junior-synonymy of E. anomalochaeta. This is the first formal report of Exogone anomalochaeta out of the Southern Ocean, although the presence of this species in waters off southern Brazil was already known from two unpublished PhD thesis (Fukuda 2010; Barroso 2011). Geographic distribution and bathymetric range. Southern Ocean — Commonwealth Bay and Macquarie Island (type locality — from the intertidal zone to ~ 10 m deep) (Benhan 1921); South Shetland Islands, 19 – 184 m deep (San Martín & Parapar 1997). Brazilian specimens were collected from 749 – 1050 m deep.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B61FFAE26F1FB71FDD7842C.taxon	materials_examined	Type species. Paedophylax hebes Webster & Benedict, 1884.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B61FFAE26F1FB71FDD7842C.taxon	diagnosis	Diagnosis. Body short, slender, palps totally fused or with only distal notch. Prostomium with 2 pair of eyes, sometimes also 1 pair of anterior eyespots; 3 antennae, frequently inserted away from each other. Peristomium with 1 pair of peristomial cirri. Dorsal cirri short, papilliform or ovate; ventral cirri smaller than dorsal ones. Falcigers with little variation along body, unidentate or bidentate, the latter with distal tooth larger than subdistal one. Some species with dorsalmost falcigers with remarkably longer blades, similar to spiniger-like chaetae. Dorsal simple chaetae with similar morphology throughout body, unidentate or bidentate. Reproduction by epigamy, with ventral incubation of eggs and embryos; some species viviparous.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B61FFAE26F1FB71FDD7842C.taxon	discussion	Remarks. See remarks of Exogone.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B61FFAD26F1F980FF5E85E2.taxon	materials_examined	Material examined. Project ' Oceanprof '. 22 ° 04 ’ 32.8 ” S, 39 ° 54 ’ 11.4 ” W, 0 – 2 cm, 722 m deep: 1 spec. (MNRJP 1153), 30 Jun 2003; 22 ° 04 ’ 33.9 ” S, 39 ° 52 ’ 05.1 ” W, 0 – 2 cm, 1030 m deep: 1 spec. (MNRJP 1154), 30 Jun 2003; 22 ° 04 ’ 43.3 ” S, 39 ° 49 ’ 09.3 ” W, 0 – 2 cm, 1299 m deep: 1 spec. (MNRJP 1155), 25 Mar 2006; 22 ° 35 ’ 03.7 ” S, 40 ° 08 ’ 52.5 ” W, 0 – 2 cm, 1043 m deep: 2 specs (MNRJP 1156), 15 Jun 2003; 22 ° 34 ’ 05.0 ” S, 40 ° 00 ’ 12.6 ” W, 0 – 2 cm, 1337 m deep: 1 spec. (MNRJP 1157), 15 Jun 2003; 22 ° 26 ’ 28.8 ” S, 39 ° 58 ’ 53.3 ” W, 0 – 2 cm, 1046 m deep: 2 specs (MNRJP 1158), 20 Jun 2003; 22 ° 30 ’ 21.7 ” S, 39 ° 56 ’ 53.7 ” W, 0 – 2 cm, 1353 m deep: 1 spec. (MNRJP 1159), 21 Jun 2003. Project ‘ HABITATS ’. 21 ° 42 ’ 37 ” S, 40 ° 8 ’ 59 ” W, 147 m deep: 1 spec., 9 Mar 2009; 22 ° 31 ’ 7 ” S, 40 ° 31 ’ 32 ” W, 139 m deep: 8 specs, 23 Feb 2009; 23 ° 11 ’ 29 ” S, 41 ° 0 ’ 49 ” W, 150 m deep: 5 specs, 21 Feb 2009; 23 ° 13 ’ 2 ” S, 40 ° 57 ’ 36 ” W, 724 m deep: 3 specs, 24 Jun 2008; 23 ° 13 ’ 48 ” S, 40 ° 55 ’ 56 ” W, 986 m deep: 39 specs, 8 May 2009; 23 ° 15 ’ 11 ” S, 40 ° 53 ’ 53 ” W, 1302 m deep: 18 specs, 9 May 2008; 23 ° 36 ’ 14 ” S, 41 ° 21 ’ 29 ” W, 142 m deep: 1 spec., 1 Mar 2009. Project ‘ AMBES ’. 19 ° 54 ’ 4 ” S, 39 ° 22 ’ 27 ” W, 1335 m deep: 6 specs, 27 Jun 2013; 21 ° 4 ’ 14 ” S, 40 ° 14 ’ 14 ” W, 141 m deep: 1 spec., 11 Jul 2013. Additional material examined. Parexogone wolfi — United States, Florida, off Port Everglades (26 ° 00 ' 54 " N, 80 ° 03 ' 24 " W), 188 m deep: 1 spec. (USNM 101326, holotype), det. G. San Martín, 1991; France, Bay of Biscay, Capbreton Canion (43 ° 43 ' 25 " N, 02 ° 18 ' 17 " W) 983 – 1032 m deep: 3 specs (MNCN 16.01 / 2948), coll. Campaña Capbreton 88, 8 Jul 1988, det. G. San Martín, Ceberio & Aguirrezabalaga.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B61FFAD26F1F980FF5E85E2.taxon	description	Description. Body thin, elongate; longest specimen examined 6.0 mm long, 0.2 mm wide, with 67 chaetigers. Palps completely fused, triangular. Prostomium ovate, shorter than palps, with two pairs of eyes in trapezoidal arrangement, anterior and posterior eyes sometimes close to each other, nearly coalescent; antennae inserted slightly separated from each other; lateral antennae inserted slightly anteriorly to median antenna, approximately in front of anterior eyes, ovate to digitiform; median antenna inserted on middle of prostomium or slightly anteriorly, up to 5 times longer than lateral ones, reaching beyond tip of palps or chaetiger 4, if directed posteriorly (Fig. 3 A, J). Peristomium shorter than subsequent segments; peristomial cirri ovate to papilliform, shorter than lateral antennae (Fig. 3 A, J). Dorsal cirri on all chaetigers, papilliform, larger than peristomial cirri but shorter than lateral antennae (Fig. 3 A, J); ventral cirri similar to peristomial cirri. Compound chaetae as spiniger-like and falcigers. Anterior parapodia with up to 3 spiniger-like chaetae each, from midbody onwards 1 – 2 spiniger-like chaetae per parapodium; shafts of spiniger-like chaetae from anterior and mid-body chaetigers with long and thin distal spines; blades bidentate and spinulate, spines of almost uniform length, except for the distalmost spines, much longer than remaining and directed distally, reaching beyond level of distal tooth (" aristae "); blades 55 – 35 µm long on anterior parapodia, 80 – 58 µm long on midbody and 40 – 10 µm long on posterior parapodia (Fig. 3 B – D, K). Anterior parapodia with 8 – 10 falcigers each, midbody with 3 – 4, posterior parapodia with 2 – 3 falcigers each; shafts of facigers distally spinulated, spines longer on anterior body; falciger blades bidentate and spinulate, teeth close to each other, distal tooth slightly larger, blades with distally directed aristae reaching beyond level of distal tooth, sometimes absent on posterior body; blades of falcigers 22 – 11 µm long on anterior parapodia, 28 – 11 µm on midbody, and 12 – 8 µm long on posterior parapodia (Fig. 3 B – D, L). Dorsal simple chaetae present from proventricle level, sigmoid, distally tapering, bidentate and spinulated, aristae reaching beyond level of distal tooth, chaetae progressively stouter and more conspicuously bidentate towards posterior body (Fig. 3 E – F); ventral simple chaetae only present on posterior body, bidentate, smooth or with short subdistal spines (Fig. 3 G). Anterior parapodia with up to 3 aciculae each, distally inflated and slightly oblique, with apparently hollow tips (Fig. 3 H); single acicula per parapodium from midbody onwards, similar in shape to those of anterior body chaetigers, but progressively stouter (Fig. 3 I). Pygidium with 1 pair of elongate anal cirri as long as median antenna. Pharynx through 3 – 4 chaetigers, with conical tooth close to anterior border; proventricle extending for ~ 3 chaetigers, with ~ 16 rows of muscle cells (Fig. 3 A).	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B61FFAD26F1F980FF5E85E2.taxon	discussion	Remarks. Brazilian specimens have longer blades of spiniger-like chaetae, up to 80 µm long, similar to those of specimens from the Gulf of México and Florida (San Martín 1991), and Bay of Biscay (San Martín 2003), while Australian specimens have spiniger-like chaetae with shorter blades, up to 58 µm long (San Martín 2005). Furthermore, the specimens herein analysed have the proventricle extending through 3 chaetigers, while specimens from other localities have a shorter proventricle, extending through 2 chaetigers (San Martín 1991, 2005). The wide distribution and bathymetric range of this species, together with the discrepancies between descriptions of specimens from different localities, may indicate that this is in fact a complex of sibling species. Although already informally recorded in Brazil (Fukuda 2010; Barroso 2011), this is the first formal report of this species to Brazilian waters. Geographic distribution and bathymetric range. Atlantic Ocean — USA, Florida, 188 m deep (type locality) (San Martín 1991); Gulf of México, 34 – 106 m deep (Uebelacker 1984); Bay of Biscay, 1000 m deep (San Martín et al. 1996); Angola Basin, 3964 – 5497 m deep (Böggemann & Purschke 2005; Böggemann 2009). Indian Ocean — Australia, Western Australia, 8 m deep (San Martín 2005). Brazilian specimens were collected from 722 – 1353 m deep.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B63FFA126F1F980FDC38034.taxon	materials_examined	Material examined. Project ‘ Oceanprof ' ’. 22 ° 39 ’ 44.28 ” S, 40 ° 15 ’ 44.41 ” W, 0 – 2 cm, 994 m deep: 1 spec. (MNRJP 1160), 19 May 2002; 22 ° 43 ’ 17.37 ” S, 40 ° 12 ’ 12.34 ” W, 2 – 5 cm, 1157 m deep: 1 spec. (MNRJP 1161), 15 May 2002; 22 ° 10 ’ 53.4 ” S, 39 ° 52 ’ 18.3 ” W, 0 – 2 cm, 1039 m deep: 1 spec. (MNRJP 1162), 0 1 Jul 2003; 22 ° 11 ’ 04.39 ” S, 39 ° 47 ’ 04.64 ” W, 0 – 2 cm, 1654 m deep: 1 spec. (MNRJP 1163), 25 Nov 2002; 22 ° 11 ’ 16.63 ” S, 39 ° 43 ’ 44.72 ” W, 0 – 2 cm, 1964 m deep: 1 spec. (MNRJP 1164), 25 Nov 2002; 21 ° 57 ’ 15.5 ” S, 39 ° 47 ’ 41.7 ” W, 2 – 5 cm, 1857 m deep: 1 spec. (MNRJP 1165), 28 Jun 2003; 21 ° 52 ’ 59.2 ” S, 39 ° 55 ’ 32.2 ” W, 0 – 2 cm, 751 m deep: 1 spec. (MNRJP 1166), 29 Jun 2003; 22 ° 31 ’ 11.8 ” S, 40 ° 15 ’ 12.1 ” W, 0 – 2 cm, 743 m deep: 1 spec. (MNRJP 1167), 18 Jun 2003; 22 ° 35 ’ 03.7 ” S, 40 ° 08 ’ 52.5 ” W, 0 – 2 cm, 1043 m deep: 1 spec. (MNRJP 1168), 15 Jun 2003; 22 ° 27 ’ 31.1 ” S, 40 ° 09 ’ 23.5 ” W, 0 – 2 cm, 749 m deep: 1 spec. (MNRJP 1169), 18 Jun 2003; 22 ° 34 ’ 05.0 ” S, 40 ° 00 ’ 12.6 ” W, 0 – 2 cm, 1337 m deep: 1 spec. (MNRJP 1170), 15 Jun 2003; 22 ° 37 ’ 02.9 ” S, 39 ° 56 ’ 20.1 ” W, 0 – 2 cm, 1945 m deep: 1 spec. (MNRJP 1171), 13 Jun 2003;. Project ‘ HABITATS ’. 22 ° 19 ’ 57 ” S, 40 ° 1 ’ 59 ” W, 707 m deep: 1 spec., 7 Jul 2008; 22 ° 36 ’ 27 ” S, 40 ° 22 ’ 29 ” W, 700 m deep: 3 specs, 25 Jun 2008; 22 ° 49 ’ 22 ” S, 40 ° 8 ’ 17 ” W, 1864 m deep: 1 spec., 11 May 2008; 23 ° 13 ’ 46 ” S, 40 ° 55 ’ 56 ” W, 986 m deep: 1 spec., 8 May 2008; 23 ° 15 ’ 11 ” S, 40 ° 53 ’ 48 ” W, 1302 m deep: 3 specs, 9 May 2008. Project ‘ AMBES ’. 19 ° 3 ’ 29 ” S, 37 ° 48 ’ 39 ” W, 1302 m deep: 2 specs, 30 Jan 2012; 19 ° 34 ’ 20 ” S, 38 ° 41 ’ 19 ” W, 449 m deep: 5 specs, 30 Jun 2013; 19 ° 40 ’ 8 ” S, 39 ° 7 ’ 22 ” W, 1035 m deep: 23 specs, 13 Dec 2011; 19 ° 50 ’ 1 ” S, 39 ° 26 ’ 30 ” W, 1055 m deep: 6 specs, 11 Jan 2012; 19 ° 53 ’ 31 ” S, 39 ° 32 ’ 56 ” W, 1023 m deep: 22 specs, 13 Jan 2012; 19 ° 58 ’ 11 ” S, 39 ° 31 ’ 38 ” W, 1300 m deep: 4 specs, 13 Jan 2012; 20 ° 16 ’ 35 ” S, 38 ° 27 ’ 18 ” W, 1902 m deep: 1 spec., 21 Dec 2011; 20 ° 36 ’ 2 ” S, 39 ° 51 ’ 35 ” W, 1000 m deep: 8 specs, 8 Jan 2012; 20 ° 36 ’ 42 ” S, 39 ° 49 ’ 25 ” W, 1333 m deep: 6 specs, 8 Jan 2012; 21 ° 4 ’ 43 ” S, 40 ° 8 ’ 31 ” W, 1023 m deep: 11 specs, 30 Dec 2011; 21 ° 4 ’ 51 ” S, 40 ° 4 ’ 14 ” W, 1300 m deep: 7 specs, 31 Dec 2011.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B63FFA126F1F980FDC38034.taxon	description	Description. Body filiform, longest specimen examined 4 mm long, 0.2 mm wide, with 39 chaetigers. Palps subpentagonal, totally fused, distally pointed (Figs. 4 A, J; 5 A – D). Prostomium ovate, with two pairs of eyes in trapezoidal arrangement; antennae inserted slightly separated from each other, approximately between posterior eyes; lateral antennae digitiform, reaching chaetiger 2, if directed posteriorly; median antenna about twice as long as lateral ones, reaching beyond tips of palps and chaetiger 4, if directed posteriorly (Fig. 4 A). Peristomium shorter than subsequent segments, peristomial cirri ovate, shorter than lateral antennae (Figs 4 A, J; 5 B). Dorsal cirri digitiform, longer than peristomial cirri but shorter than lateral antennae, progressively thinner towards posterior body (Figs 4 A; 5 A – B); ventral cirri similar to dorsal cirri but slightly shorter (Fig. 5 C – D). Anterior parapodia with 9 – 15 compound chaetae each, midbody with 5 – 7, posterior parapodia with 3 – 4 compound chaetae each; compound chaetae with smooth to slightly spinulated shafts, blades unidentate to sub-bidentate, with relatively coarse spines and conspicuous dorso-ventral gradation in length (Figs 4 F – I, K – L; 6 A – E); blades 60 – 10 µm long on anterior body parapodia, 80 – 10 µm on midbody and 50 – 10 µm on posterior body parapodia. Dorsal simple chaetae present from midbody onwards, subdistally spinulated, sub-bidentate with acute, needle-like tip (Figs 4 B; 6 F – G); ventral simple chaetae only present on posterior chaetigers, slightly spinulated, sub-bidentate (Fig. 4 C). Anterior body parapodia with 2 aciculae each, subdistally inflated, with sharp, acute, needle-like tip; from midbody onwards, single acicula per parapodium, with similar shape (Fig. 4 D – E). Pygidium with 1 pair of thin, elongate anal cirri, longer than posterior dorsal cirri and median antenna. Pharynx through 3 chaetigers, with conical tooth close to anterior border; proventricle extending for 5 chaetigers, with ca. 15 – 17 rows of muscle cells (Fig. 4 A).	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B63FFA126F1F980FDC38034.taxon	discussion	Remarks. Brazilian specimens match the original description of P. campoyi in all characters. Geographic distribution and bathymetric range. Atlantic Ocean — Bay of Biscay (type locality), 1000 – 1100 m deep (San Martín et al. 1996); North Sea — UK, Tynemouth (San Martín & Worsfold 2015). Brazilian specimens were collected from 743 – 1964 m deep.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B6EFFA726F1F8EBFED48619.taxon	materials_examined	Material examined. Project ' Oceanprof '. 22 ° 04 ’ 32.8 ” S, 39 ° 54 ’ 11.4 ” W, 0 – 2 cm, 722 m deep: 2 specs (MNRJP 1172), 30 Jun 2003; 21 ° 57 ’ 11.8 ” S, 39 ° 56 ’ 04.2 ” W, 0 – 2 cm, 698 m deep: 3 specs (MNRJP 1173), 29 Jun 2003; 22 ° 36 ’ 01.3 ” S, 40 ° 21 ’ 43.7 ” W, 0 – 2 cm, 754 m deep: 4 specs (MNRJP 1174), 11 Jun 2003; 22 ° 31 ’ 11.8 ” S, 40 ° 15 ’ 12.1 ” W, 0 – 2 cm, 743 m deep: 1 spec. (MNRJP 1175), 18 Jun 2003; 22 ° 27 ’ 31.1 ” S, 40 ° 09 ’ 23.5 ” W, 0 – 2 cm, 749 m deep: 1 spec. (MNRJP 1176), 18 Jun 2003. Additional material examined. Exogone minuscula — Antarctica, South Shetland Islands, Livingston Island, off False Bay, 31 m deep: 1 spec. (USNM 46549), coll. W. L. Schmitt, Feb 1963, det. O. Hartman; Antarctica, Antarctica Peninsula, Palmer Archipelago, Anvers Island, Arthur Harbor, 40 m deep: 20 specs (USNM 46849), coll. J. S. Rankin, 17 Mar 1968, det. O. Hartman. Exogone obtusa — Antarctica, Antarctica Peninsula, near Joinville (63 ° 30 ' S, 54 ° 15 ' W), mud with gravel and stones, 220 m deep: 1 spec. (ZMH P- 18965, holotype), coll. R / V ' Polarstern' st. 120, 21 Nov 1984, det. G. Hartmann-Schröder, 1987; Antarctica, Antarctica Peninsula, near Joinville (62 ° 51 ' S, 56 ° 00 ' W), 133 m deep: 4 specs (ZMH P- 19165, paratypes), coll. R / V ' Polarstern' st. 158, 26 Nov 1984, det. G. Hartmann-Schröder & P. Rosenfeldt.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B6EFFA726F1F8EBFED48619.taxon	description	Description. Body filiform, longest specimen examined 2.6 mm long, 0.2 mm wide, with 33 chaetigers. Palps triangular, totally fused, distally blunt (Fig. 7 A). Prostomium rectangular, with two pairs of eyes in trapezoidal arrangement; antennae inserted close to each other, on middle of prostomium or slightly posteriorly; lateral antennae digitiform, reaching chaetiger 2, if directed posteriorly; median antenna elongate, reaching chaetiger 4, if directed posteriorly (Fig. 7 A). Peristomium shorter than subsequent segments with small, papilliform peristomial cirri. Dorsal cirri ovate, slightly larger than peristomial cirri, absent on chaetiger 2; dorsal cirri progressively longer towards posterior body (Fig. 7 A). Ventral cirri shorter than dorsal cirri, larger than peristomial cirri. Anterior parapodia with 10 – 16 compound chaetae each, midbody with 5 – 6, posterior parapodia with 2 – 3 compound chaetae each; compound chaetae with subdistally spinulated shafts and spinulated and bidentate blades, with distal tooth rounded and larger; blades with tips progressively more strongly curved towards posterior body, especially in ventralmost chaetae; blades 50 – 15 µm long on anterior body, 23 – 15 µm long on midbody and 20 – 10 µm long on posterior body (Fig. 7 B – C, F, I – K). Dorsal simple chaetae present from anterior body, slightly sigmoid, bidentate and subdistally spinulated, distal tooth slightly larger and rounded on anterior body, with tip progressively more acute towards posterior body (Fig. 7 D – E); ventral simple chaetae present from midbody, more conspicuously sigmoid than dorsal simple chaetae, bidentate and subdistally spinulated (Fig. 7 G). Parapodia throughout with single acicula each, with inflate, rounded and apparently hollow tip (Fig. 7 H). Pygidium with long anal cirri, with length equivalent to length of 3 posteriormost chaetigers together. Pharynx through 4 chaetigers, with conical tooth slightly away from anterior border; proventricle through 4 – 5 chaetigers, with ca. 17 – 19 rows of muscle cells (Fig. 7 A).	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B6EFFA726F1F8EBFED48619.taxon	discussion	Remarks. This species is readily recognizable by the morphology of the dorsal simple chaetae and compound chaetae, with the characteristic falcate, bidentate blades, more conspicuously in ventralmost falcigers from midbody onwards. We examined the type material of P. obtusa and could not find significant differences to P. minuscula, therefore considering the former as a junior-synonym of the latter species. Geographic distribution and bathymetric range. Atlantic Ocean — South Georgia, Moraine Fjord, 148 m deep (type locality); Falkland Islands, 12 – 40 m deep (Hartman 1953). Brazilian specimens were collected from 698 – 754 m deep.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B68FFA726F1FB9DFDA8852B.taxon	materials_examined	Type species. Sphaerosyllis xarifae Hartmann-Schröder, 1960, designated by San Martín (1984 a).	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B68FFA726F1FB9DFDA8852B.taxon	diagnosis	Diagnosis. Body short, covered dorsally and ventrally with numerous papillae, including on palps, cirri and parapodia. Prostomium with 3 antennae, 4 eyes and usually 1 pair of anterior eyespots. Peristomium with 1 pair of peristomial cirri. Dorsal cirri usually present on all chaetigers, absent on chaetiger 2 in a few species. Antennae, peristomial cirri, dorsal cirri throughout and anal cirri with spherical base (cirrophore) and pointed, distally blunt tip (cirrostyle) usually retractable within cirrophore, at least from midbody. Parapodial glands usually absent. Blades of falcigers usually unidentate and relatively short, with dorso-ventral gradation in length. Aciculae subdistally inflated and slightly curved, with acute tip. Pharynx long and wide, usually not surrounded by soft papillae on opening, pharyngeal tooth conical, usually away from anterior margin; proventricle massive, about same size as pharynx (Fukuda et al. 2009). Reproduction with dorsal brooding of eggs.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B68FFA726F1FB9DFDA8852B.taxon	discussion	Remarks. San Martín (1984 a) recognized two subgenera of Sphaerosyllis based on morphology, Sphaerosyllis and Prosphaerosyllis. Although this division was not immediately accepted by some authors (Russell 1989; Kudenov & Harris 1995), San Martín (2003) raised Prosphaerosyllis to the generic level, taking into account the brooding system, which is different from one genus to another, and this proposal has been adopted by subsequent authors (Böggemann & Westheide 2004; San Martín 2005; Fukuda et al. 2009). In Brazil, three species of Prosphaerosyllis were already reported, P. brachycephala Fukuda, Yunda-Guarin & Nogueira, 2009, P. isabelllae and P. xarifae (Fukuda et al. 2009).	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B68FFA626F1F88CFA9C83FC.taxon	materials_examined	Material examined. Project ' Oceanprof '. 22 ° 40 ’ 57.84 ” S, 40 ° 16 ’ 30.35 ” W, 0 – 2 cm, 1045 m, 1 spec. (MNRJP 1177), 22 Nov 2002.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B68FFA626F1F88CFA9C83FC.taxon	diagnosis	Diagnosis. Palps densely papillated. Dorsal cirri throughout with bulbous base, with iridescent inclusions, distal end with nearly spherical tip. A pair of papillae on each parapodium; aciculae subdistally bent and thick, with acute tip. Pharynx with pair of brown glands in chaetiger 1.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B68FFA626F1F88CFA9C83FC.taxon	discussion	Remarks. The specimen herein studied is similar to those of the original description. This is the deepest record of this species. Geographic distribution and bathymetric range. Atlantic Ocean — Brazil, Rio de Janeiro, 110 – 1045 m deep; São Paulo, shallow subtidal to 808 m deep (Nogueira et al. 2001; Fukuda et al. 2009); Pacific Ocean: Australia, 6 – 30 m deep (San Martín 2005). The specimen found in Campos Basin was obtained from 1045 m deep.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B69FFA626F1FDB1FDB6865B.taxon	materials_examined	Type species. Sphaerosyllis hystrix Claparède, 1863.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B69FFA626F1FDB1FDB6865B.taxon	diagnosis	Diagnosis. Small bodied specimens, body usually covered by numerous papillae. Palps totally fused or with distal notch. Prostomium with 3 antennae and 2 pairs of eyes, anterior eyespots usually absent. Peristomium with 1 pair of peristomial cirri. Antennae, peristomial and dorsal cirri with similar shape, with bulbous, inflate bases, and narrower, tapering tips. Dorsal cirri usually absent on chaetiger 2. Parapodial glands frequently present, with granular or fibrilar material. Compound chaetae as heterogomph falcigers, usually with short, unidentate blades. Aciculae frequently stout, subdistally bent at ~ 90 °, with acute tips. Pharynx narrow, with opening surrounded by soft, rounded papillae, and conical central tooth at anterior margin; proventricle short, with few, coarse rows of muscle cells. Reproduction by epigamy, with ventral incubation of eggs and embryos.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B69FFA626F1FDB1FDB6865B.taxon	discussion	Remarks. The genus currently counts with 2 formal records for the Brazilian coast, S. annulata Nogueira, San Martín & Fukuda, 2004 and S. brasiliensis Nogueira, San Martín & Amaral, 2001, plus ~ 8 other species, from informal records (e. g., Fukuda 2010).	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B69FFBB26F1FB5CFB8F84B4.taxon	materials_examined	Type material. Holotype (MNRJP 1178): 22 ° 26 ’ 28.8 ” S, 39 ° 58 ’ 53.3 ” W, 0 – 2 cm, 1046 m deep, 20 Jun 2003. Paratypes: 19 ° 53 ’ 31 ” S, 39 ° 32 ’ 56 ” W, 1023 m deep: 48 specs (MZUSP 2964), 13 Jan 2012; 21 ° 4 ’ 43 ” S, 40 ° 8 ’ 31 ” W, 1024 m deep: 24 specs (MZUSP 2965), 30 Dec 2011; 22 ° 40 ’ 57.84 ” S, 40 ° 16 ’ 30.35 ” W, 0 – 2 cm, 1045 m deep: 2 specs (ZUEC POL 19881), 22 Nov 2002; 22 ° 10 ’ 54.6 ” S, 39 ° 48 ’ 59.5 ” W, 0 – 2 cm, 1336 m deep: 2 specs (MNRJP 1179), 25 Jun 2003; 22 ° 04 ’ 33.9 ” S, 39 ° 52 ’ 05.1 ” W, 0 – 2 cm, 1030 m deep: 2 specs (MNRJP 1180), 30 Jun 2003; 21 ° 52 ’ 51.8 ” S, 39 ° 48 ’ 12.5 ” W, 2 – 5 cm, 1372 m deep: 1 spec. (MNRJP 1181), 26 Jun 2003; 22 ° 31 ’ 12 ” S, 40 ° 15 ’ 11 ” W, 0 – 2 cm, 722 m deep: 1 spec. (MNRJP 1182), 22 Nov 2002; 22 ° 26 ’ 28.5 ” S, 39 ° 54 ’ 08.3 ” W, 0 – 2 cm, 1354 m deep: 2 specs (MNRJP 1183), 21 Jun 2003; 22 ° 31 ’ 37.2 ” S, 39 ° 55 ’ 14.5 ” W, 0 – 2 cm, 1630 m deep: 1 spec. (MNRJP 1184), 16 Jun 2003. Additional material. Project ‘ AMBES ’. 19 ° 3 ’ 29 ” S, 37 ° 48 ’ 39 ” W, 1302 m deep: 3 specs, 30 Jan 2012; 19 ° 40 ’ 8 ” S, 39 ° 7 ’ 22 ” W, 1035 m deep: 15 specs, 13 Dec 2011; 19 ° 47 ’ 5 ” S, 39 ° 3 ’ 11 ” W, 1258 m deep: 1 spec., 28 Jan 2012; 19 ° 49 ’ 37 ” S, 39 ° 35 ’ 41 ” W, 410 m deep: 1 spec., 14 Jan 2012; 19 ° 50 ’ 1 ” S, 39 ° 26 ’ 30 ” W, 1055 m deep: 10 specs, 11 Jan 2012; 19 ° 52 ’ 56 ” S, 38 ° 35 ’ 8 ” W, 1022 m deep: 10 specs, 17 Dec 2011; 19 ° 54 ’ 5 ” S, 39 ° 22 ’ 20 ” W, 1335 m deep: 1 spec., 11 Jan 2012; 19 ° 58 ’ 11 ” S, 39 ° 31 ’ 38 ” W, 1300 m deep: 5 specs, 13 Jan 2012; 20 ° 4 ’ 8 ” S, 38 ° 31 ’ 27 ” W, 1302 m deep: 2 specs, 21 Dec 2011; 20 ° 15 ’ 36 ” S, 39 ° 46 ’ 15 ” W, 1040 m deep: 30 specs, 9 Jan 2012; 20 ° 17 ’ 41 ” S, 39 ° 42 ’ 38 ” W, 1358 m deep: 2 specs, 9 Jan 2012; 20 ° 36 ’ 2 ” S, 39 ° 51 ’ 35 ” W, 1000 m deep: 49 specs, 8 Jan 2012, and 35 specs, 18 Jun 2013; 20 ° 36 ’ 42 ” S, 39 ° 49 ’ 25 ” W, 1333 m deep: 5 specs, 8 Jan 2012; 21 ° 4 ’ 43 ” S, 40 ° 4 ’ 12 ” W, 1295 m deep: 1 spec., 9 Jun 2013; 21 ° 4 ’ 51 ” S, 40 ° 4 ’ 14 ” W, 1300 m deep: 1 spec., 31 Dec 2011.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B69FFBB26F1FB5CFB8F84B4.taxon	description	Description. Holotype with 40 chaetigers, 2.4 mm long and 0.2 mm wide; complete paratypes with 29 – 33 chaetigers, 1.4 – 1.9 mm long, 0.2 – 0.3 mm wide. Dorsum scattered with small papillae, more conspicuously dorsolaterally (Figs 8 I – J, 9 A – B), papillae more elongate towards posterior body (Fig. 9 C). Palps slightly longer than prostomium, almost totally fused, with distal notch, median line well marked (Figs 8 A, I; 9 A – B), sometimes with tips ventrally bent. Prostomium rectangular, with 2 pairs of eyes in trapezoidal arrangement; lateral antennae inserted close to anterior border of prostomium, almost reaching tip of palps; median antenna inserted posteriorly to middle of prostomium, slightly longer than lateral antennae, reaching around same level as lateral antennae (Figs 8 A, I; 9 A – B). Peristomium slightly shorter than anterior body chaetigers, sometimes forming a fold covering posterior part of prostomium, especially middorsally, reaching base of median antenna (Figs 8 I; 9 A – B). Antennae, peristomial and dorsal cirri throughout with similar morphology, basally bulbous and with elongate, thin tip. Dorsal cirri of uniform length throughout, shorter than antennae (Figs 8 A, I – J; 9 A – C). Thin, digitiform ventral cirri, shorter than dorsal cirri, of uniform length throughout (Fig. 9 I). From chaetiger 4 onwards, each parapodium with one gland containing fibrilar inclusions, 1 pair per chaetiger, located dorsally to bases of dorsal cirri; glands opening dorsally through prominent papilla, larger than other papillae (Fig. 8 A, I – J). Anterior parapodia with 6 – 7 falcigers each, midbody with 4 – 5, posterior parapodia with 2 – 4 falcigers each; falcigers with distally spinulated shafts, with elongate spines; blades spinulated, with straight spines, approximately of uniform length along blade, more evident on dorsalmost and intermediate falcigers in each fascicle; blades bidentate to sub-bidentate, subdistal tooth much smaller, resembling an enlarged spine, more evident on dorsalmost chaetae; subdistal tooth progressively shorter ventralwards within each fascicle, ventralmost chaetae usually unidentate with a developed subdistal spine (Figs 8 F – H, K – L; 9 D, F – I); blades 45 – 20 µm long on anterior body, 50 – 20 µm on midbody, and 30 – 20 µm long on posterior body. Dorsal simple chaetae present from first chaetiger onwards, sigmoid, distally spinulate (Figs 8 C, M; 9 E); ventral simple chaetae present from midbody, sigmoid, smooth (Fig. 8 D). Anterior body with 2 aciculae per parapodium, one distally bent at 90 °, with acute tip, other straight, distally pointed; single acicula per parapodium in mid- and posterior body chaetigers, of first type; aciculae progressively stouter towards posterior body (Fig. 8 B, E). Pygidium with 1 pair of anal cirri longer and thinner than dorsal cirri. Pharynx through 3 – 4 chaetigers, with conical tooth on anterior border; proventricle through 3 chaetigers, with ca. 15 rows of muscle cells (Fig. 8 A).	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B69FFBB26F1FB5CFB8F84B4.taxon	discussion	Remarks. Sphaerosyllis ceciliae sp. nov. is similar to S. boeroi Musco, Çinar & Giangrande, 2005, S. hystrix Claparède, 1863, S. parabulbosa San Martín & López, 2002, S. taylori Perkins, 1981, and S. thomasi San Martín, 1984 b, due to the fibrilar nature of the inclusions within the parapodial glands. However, S. ceciliae sp. nov. differs from S. parabulbosa, S. taylori and S. thomasi on the morphology of the falcigers, remarkably longer bidentate / sub-bidentate blades in the new species compared to these congegers; furthermore, S. thomasi and S. taylori present blades more conspicuously spinulated than in S. ceciliae sp. nov. Sphaerosyllis hystrix differs from S. ceciliae sp. nov. in having antennae and cirri throughout proportionally larger than S. ceciliae sp. nov., and the subdistal tooth / spine of the falciger blades of S. ceciliae sp. nov. is more conspicuous and longer than in S. hystrix, although the spinulation of the blades is more prominent in the latter species. Sphaerosyllis boeroi, described from the Mediterranean Sea, is probably the most similar species to S. ceciliae sp. nov., but can be distinguished by the longer blades of the midbody falcigers (up to 62.5 µm long in S. boeroi, against up to 50 µm long in S. ceciliae sp. nov.), as well as by the more conspicuous spinulation of the falcigers blades. Furthermore, S. boeroi inhabits shallower environments (5 – 150 m), when compared to those where S. ceciliae sp. nov. was found (749 – 1903 m). The large papilla present above each parapodial gland seems to be connected to the gland, serving as a channel through which the inclusions are discharged to the environment. Many specimens were found with fibrilar components partially extruded through the openings on top of these papillae, and those components are similar to the ones observed by transparency inside the glands. Geographic distribution and bathymetric range. Sphaerosyllis ceciliae sp. nov. is only known from the Campos Basin (749 – 1903 m deep).	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B69FFBB26F1FB5CFB8F84B4.taxon	etymology	Etymology. This species is dedicated to Cecilia Amaral, a famous Brazilian polychaetologist, for her essential contribution to the knowledge of Brazilian marine invertebrates, especially polychaetes, as well as her for continuous efforts regarding research and education of new polychaetologists.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B74FFB926F1F8F6FD1480A1.taxon	materials_examined	Material examined. Project ' Oceanprof '. 22 ° 04 ’ 32.8 ” S, 39 ° 54 ’ 11.4 ” W, 722 m deep: 1 spec. (ZUEC POL 19882, Holotype), 30 Jun 2003.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B74FFB926F1F8F6FD1480A1.taxon	description	Description. Body filiform, holotype 3 mm long, 0.2 mm wide, complete, with 47 chaetigers. Dorsum scattered with few short, digitiform papillae, more evident dorso-laterally. Palps completely fused, distally rounded. Prostomium shorter than palps, rectangular, with two pairs of eyes in trapezoidal arrangement, anterior eyespots absent. Antennae all about same size, median antenna inserted slightly posteriorly to lateral ones (Fig. 10 A). Peristomium covering the posterior part of prostomium, including part of posterior eyes. Antennae, peristomial and dorsal cirri throughout with similar morphology, basally bulbous, with elongate, thin tip. Dorsal cirri absent on chaetiger 2; thin, digitiform ventral cirri, shorter than dorsal cirri, of uniform length throughout. Parapodial lobes rectangular to distally rounded; parapodial glands absent. Anterior parapodia with 5 – 6 falcigers each, midbody with 4 – 5, posterior parapodia with 3 – 4 falcigers each; anterior body falcigers with subdistally spinulated shafts, especially dorsalmost ones; from midbody parapodia onwards, falcigers with smooth shafts; blades of dorsalmost and intermediate falcigers poorly spinulated, ventralmost falcigers with smooth blades; blades unidentate, except for some sub-bidentate dorsalmost falcigers on posterior body chaetigers, with prominent subdistal spine; blades 30 – 10 µm long on anterior body, 25 – 15 µm on midbody, and 15 – 10 µm long on posterior body (Fig. 10 B – C). Dorsal simple chaetae on all chaetigers, subdistally spinulated (Fig. 10 D); ventral simple chaetae present from midbody chaetigers, sigmoid, smooth (Fig. 10 E). Parapodia all with single acicula each, distally bent at 90 °, aciculae progressively stouter towards posterior body (Fig. 10 F). Pygidium with 1 pair of anal cirri slightly larger than posterior body dorsal cirri (Fig. 10 G). Pharynx through 2 chaetigers, with conical tooth near anterior border; proventricle extending for 3 chaetigers, with ca. 17 rows of muscle cells (Fig. 10 A).	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B74FFB926F1F8F6FD1480A1.taxon	discussion	Remarks. Sphaerosyllis monicae sp. nov. differs from all known species of Sphaerosyllis by the complete absence of both parapodial glands and papillae over the body and parapodia, as well as by the morphology of falcigers and aciculae.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B74FFB926F1F8F6FD1480A1.taxon	description	Geographic distribution and bathymetric range. Sphaerosyllis monicae sp. nov. is only known from the Campos Basin, at 722 m deep.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B74FFB926F1F8F6FD1480A1.taxon	etymology	Etymology. This species is dedicated to Mônica Petti, a great Brazilian polychaetologist, for her relevant contribution to the knowledge of polychaetes.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B76FFB926F1FCB8FB4687BF.taxon	materials_examined	Type species. Syllis monilaris Savigny in Lamarck, 1818.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B76FFB926F1FCB8FB4687BF.taxon	diagnosis	Diagnosis. Body cylindrical of variable size, from relatively medium-sized to large, compared to most syllids. Subpentagonal prostomium, with 1 pair of palps totally free from each other or fused at bases, 3 antennae, 2 pairs of eyes and, sometimes, 1 pair of anterior eyespots. Peristomium usually shorter than segments, with 2 pairs of peristomial cirri; border between prostomium and peristomium usually with conspicuous nuchal organs, as 1 pair of ciliated grooves. Antennae, peristomial cirri, dorsal cirri throughout and anal cirri moniliform; ventral cirri short, digitiform. Parapodia with compound falcigers, some taxa with secondarily simple chaetae, due to fusion between shaft and blade, or loss of blade; spiniger-like chaetae frequently present; dorsal and ventral simple chaetae usually present on posterior chaetigers. Pharynx with large tooth on anterior border or slightly posteriorly to opening, trepan absent (Nogueira & San Martín 2002; Nogueira & Yunda-Guarin 2008). Reproduction by stolonization, with stolons with different morphologies, according to species. Some species viviparous.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B76FFB926F1FCB8FB4687BF.taxon	discussion	Remarks. The largest genus in the family, Syllis, as currently conceived, seems to be paraphyletic, according to phylogenetic analyses performed on the family (Aguado et al. 2007, 2012). However, until more detailed studies are made specifically on this genus, we follow herein the opinion of most authors (e. g., San Martín 2003; Álvarez- Campos et al. 2015 a, b), considering Typosyllis Langerhans, 1879 as a junior synonym of Syllis.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B76FFBF26F1F9F3FE6D81C1.taxon	materials_examined	Material examined. Project ' Oceanprof '. 22 ° 27 ’ 31.1 ” S, 40 ° 09 ’ 23.5 ” W, 2 – 5 cm, 749 m deep: 1 spec. (MNRJP 1185), 18 Jun 2003. Project ‘ AMBES ’. 19 ° 34 ’ 20 ” S, 38 ° 41 ’ 18 ” W, 450 m deep: 8 specs, 9 Dec 2011; 19 ° 36 ’ 26 ” S, 39 ° 10 ’ 17 ” W, 392 m deep: 12 specs (MZUSP 2899), 14 Dec 2011; 19 ° 49 ’ 7 ” S, 39 ° 36 ’ 8 ” W, 158 m deep: 3 specs, 14 Jan 2012; 19 ° 49 ’ 37 ” S, 39 ° 35 ’ 41 ” W, 410 m deep: 1 spec., 14 Jan 2012; 20 ° 14 ’ 17 ” S, 39 ° 48 ’ 34 ” W, 395 m deep: 16 specs (MZUSP 2901), 19 Jun 2013; 20 ° 35 ’ 16 ” S, 39 ° 53 ’ 47 ” W, 410 m deep: 22 specs, 8 Jan 2012; 21 ° 4 ’ 9 ” S, 40 ° 13 ’ 7 ” W, 410 m deep: 2 specs, 30 Dec 2011. Additional material examined. Pionosyllis aciculigrossa — United States, Florida, Gulf of México, off Panamá City (29 ° 30 ' 02 " N, 86 ° 24 ' 59 " W, 189 m deep): 1 spec. (USNM 65684, paratype), coll. BLM / MMS, Sep 1975, det. G. San Martín, 1989; United States, Texas, Gulf of Mexico (26 ° 58 ' 12 " N, 96 ° 33 ' W, 106 m deep): 1 spec. (USNM 89890, paratype), coll. BLM / MMS, 1976, det. G. San Martín, 1989.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B76FFBF26F1F9F3FE6D81C1.taxon	description	Description. Body slender, subcylindrical. Largest specimen analyzed incomplete, 23 mm long, 1 mm wide, with 134 chaetigers. Palps longer than prostomium, fused along basal third. Prostomium ovate, with 2 pairs of eyes in trapezoidal arrangement; median antenna inserted slightly backwards to middle of prostomium, with ~ 26 articles; lateral antennae inserted anteriorly to anterior pair of eyes, with ~ 22 articles each (Fig. 11 A). Peristomium slightly shorter than anterior body chaetigers, dorsal peristomial cirri with ~ 20 articles each, ventral peristomial cirri shorter, with ~ 15 articles each. Dorsal cirri of chaetiger 1 about same length as median antenna, longer than remaining dorsal cirri, with ~ 25 articles each; dorsal cirri throughout with length equivalent to about half body width of corresponding chaetiger, articles progressively more elongate distalwards on each cirrus (Fig. 11 A), and also posteriorwards along body; anterior dorsal cirri with 13 – 17 articles, 8 – 13 articles per cirrus from proventricle level; ventral cirri shorter than parapodial lobes, digitiform. Parapodial lobes conical, progressively more slender and elongate towards posterior body. Anterior parapodia with 25 – 30 compound chaetae each, midbody with 7 – 15, posterior parapodia with ~ 8 compound chaetae each; 1 – 3 dorsalmost compound chaetae throughout spiniger-like (Fig. 11 B), with unidentate, slightly spinulated blades, ~ 145 µm long on anterior body, 160 – 100 µm on midbody, 110 – 90 µm long on posterior body; falcigers on anterior body more slender than remaining, with apparently unidentate, spinulate blades (Fig. 11 C), blades 60 – 20 µm long; from midbody onwards, falcigers with spinulated and bidentate blades, distal tooth slightly larger (Fig. 11 D), blades 70 – 30 µm long on midbody, 50 – 32 µm long on posterior body. Dorsal simple chaetae only present on posterior body, thinner than shafts of falcigers, slightly sigmoid, bidentate, with short subdistal spines (Fig. 11 E); ventral simple chaetae only present on posteriormost parapodia, slightly thinner than shafts of falcigers, sigmoid, smooth and bidentate, distal tooth slightly larger (Fig. 11 F). Anterior parapodia with up to 7 aciculae each, one of which much thinner, remaining aciculae with rounded to blunt tips slightly protruding from parapodial lobes (Fig. 11 G); from proventricle region, 2 distally tapering aciculae per parapodium (Fig. 11 H), single acicula per parapodium from mid- to posterior body (Fig. 11 I), with acute tips, progressively more distinctly protruding from parapodial lobes towards posterior body (Fig. 11 G – I). Pharynx through ~ 8 chaetigers, with conical tooth close to anterior border, opening surrounded by crown of soft papillae; proventricle through 7 – 8 chaetigers, with ~ 36 rows of muscle cells (Fig. 11 A).	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B76FFBF26F1F9F3FE6D81C1.taxon	discussion	Remarks. The specimens herein studied agree with the paratypes examined, including in the presence of the apparently unidentate spiniger-like chaetae, which were not mentioned in the original description (San Martín 1990). Geographic distribution and bathymetric range. Atlantic Ocean — Gulf of México (type locality, 106 – 189 m deep) (San Martín 1990); Brazil, states of São Paulo (280 m deep), Rio de Janeiro (102 – 750 m deep), and Paraná (480 m deep) (Fukuda 2010).	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B70FFBF26F1FB9AFDA285DD.taxon	materials_examined	Type species. Anguillosyllis capensis Day, 1963.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B70FFBF26F1FB9AFDA285DD.taxon	diagnosis	Diagnosis. Body of relatively small size, with few chaetigers. Palps elongated, at least partially fused for most of their length. Prostomium with 3 antennae; eyes absent. Peristomium with 1 pair of ovate to digitiform peristomial cirri. Dorsal cirri smooth, long, filiform, frequently coiled over dorsum, absent on chaetiger 2. Ventral cirri digitiform, inserted medially to distally in parapodial lobes. Parapodial lobes relatively long, with pre- and postchaetal lobes. Compound chaetae heterogomph, with unidentate, slender blades. Pharyngeral tooth absent. Reproduction unknown (Aguado & San Martín 2008).	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B70FFBF26F1FB9AFDA285DD.taxon	discussion	Remarks. Anguillosyllis was recently redefined by Aguado & San Martín (2008), who recognized Braniella Hartman, 1965 as a junior-synonym and redescribed 2 of the 3 known species, all restricted to the deep sea. Aguado & San Martín (2008) considered three valid species in this genus, A. pupa (Hartman, 1956), A. palpata and A. capensis. We describe herein an additional species, A. lanai sp. nov., from material from off southeastern Brazil, raising to four the number of known species in this genus. All the species in this genus are quite similar to each other, differing mostly by the morphology of palps, presence / absence of dorsal cirri on chaetiger 2, details on the structure of the parapodial lobes, length of the blades of compound chaetae, and presence of parapodial glands. Also, the number of chaetigers in adults seems to be constant for each species, which is not a common feature for syllids. With the amendment to the description of A. palpata proposed herein (see below), it is possible that ‘ absence of dorsal cirri on chaetiger 2 ’ should also be included in the diagnosis of the genus; the only exception being A. capensis, originally described as with dorsal cirri on all chaetigers (Day 1963), but the holotype of that species is currently in terrible shape, preventing confirmation of that character. Also, further descriptions of A. capensis do not bring clear statements on the matter, but the absence of dorsal cirri on chaetiger 2 is suggested by images (see Böggemann & Purschke 2005, Fig. 1; Aguado & San Martín 2008, Fig. 1).	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B71FFBC26F1FDE8FBAA80F9.taxon	materials_examined	Material examined. Project ‘ Habitats ’. 21 ° 11 ’ 6 ” S, 40 ° 12 ’ 17 ” W, 807 m: 3 specs, 29 Jun 2008; 22 ° 20 ’ 50 ” S, 40 ° 2 ’ 58 ” W, 705 m: 8 specs, 8 Jul 2008; 22 ° 25 ’ 54 ” S, 39 ° 53 ’ 55 ” W, 1299 m: 3 specs (MZUSP 2939), 29 May 2008; 22 ° 33 ’ 33 ” S, 40 ° 26 ’ 40 ” W, 393 m: 1 spec., 11 Jul 2008; 22 ° 52 ’ 14 ” S, 40 ° 5 ’ 8 ” W, 2455 m: 2 specs (MZUSP 2938), 22 May 2008; 22 ° 59 ’ 52 ” S, 40 ° 47 ’ 45 ” W, 689 m: 8 specs (MZUSP 2940), 24 Jun 2008; 23 ° 1 ’ 33 ” S, 40 ° 45 ’ 22 ” W, 964 m: 3 specs (MZUSP 2944), 16 Jan 2009; 23 ° 12 ’ 59 ” S, 40 ° 57 ’ 35 ” W, 761 m: 1 spec. (MZUSP 2943), 29 Jan 2009; 23 ° 13 ’ 2 ” S, 40 ° 57 ’ 36 ” W, 724 m: 12 specs, 24 Jun 2008; 23 ° 18 ’ 28 ” S, 40 ° 24 ’ 52 ” W, 2513 m: 2 specs (MZUSP 2498), 16 Fev 2009; 23 ° 3 ’ 33 ” S, 40 ° 41 ’ 53 ” W, 1285 m: 2 specs (MZUSP 2946), 17 Jan 2009; 23 ° 39 ’ 20 ” S, 41 ° 18 ’ 28 ” W, 701 m: 1 spec., 28 Jan 2009; 23 ° 41 ’ 7 ” S, 41 ° 16 ’ 4 ” W, 1017 m: 1 spec., 12 Jan 2009; 23 ° 45 ’ 8 ” S, 41 ° 11 ’ 51 ” W, 1319 m: 3 specs (MZUSP 2942), 13 Jan 2009; 23 ° 45 ’ 18 ” S, 39 ° 59 ’ 57 ” W, 2423 m: 1 spec., 6 Fev 2009; 24 ° 1 ’ 24 ” S, 40 ° 54 ’ 13 ” W, 2493 m: 1 spec., 17 Feb 2009; 24 ° 29 ’ 15 ” S, 40 ° 23 ’ 22 ” W, 2981 m: 1 spec., 19 May 2008; 24 ° 29 ’ 21 ” S, 40 ° 23 ’ 20 ” W, 3028 m: 1 spec., 5 Fev 2009. Project ‘ AMBES ’. 19 ° 3 ’ 10 ” S, 37 ° 45 ’ 28 ” W, 2954 m: 3 specs, 23 Jun 2013; 19 ° 3 ’ 30 ” S, 37 ° 48 ’ 46 ” W, 1347 m: 8 specs (MZUSP 2960), 1 Jul 2013; 19 ° 34 ’ 20 ” S, 38 ° 41 ’ 19 ” W, 449 m: 1 spec., 30 Jun 2013; 19 ° 47 ’ 2 ” S, 39 ° 3 ’ 14 ” W, 1251 m: 6 specs (MZUSP 2959), 26 Jun 2013; 19 ° 53 ’ 31 ” S, 39 ° 32 ’ 56 ” W, 1023 m: 12 specs (MZUSP 2934), 13 Jan 2012; 19 ° 54 ’ 4 ” S, 39 ° 22 ’ 29 ” W, 1335 m: 8 specs (MZUSP 2958), 27 Jun 2013; 20 ° 48 ’ 37 ” S, 38 ° 45 ’ 28 ” W, 2494 m: 1 spec. (MZUSP 2953), 15 Jun 2013; 20 ° 53 ’ 28 ” S, 38 ° 21 ’ 21 ” W, 3000 m: 1 spec. (MZUSP 2955), 12 Jun 2013; 21 ° 4 ’ 43 ” S, 40 ° 4 ’ 12 ” W, 1295 m: 9 specs (MZUSP 2927), 9 Jun 2013. Additional material examined. Braniella palpata — Argentina, Tierra del Fuego, Cape Horn, Drake Passage (56 ° 06 ’ 29 ” S, 66 ° 24 ’ 29 ” W, 384 – 494 m deep): 1 spec. (USNM 55505, holotype), coll. University of Southern California (Department of Zoology), ‘ Eltanin R / V ’, 18 Sep 1963, det. O. Hartman, 1967; Chile, Drake Passage (57 ° 13 ’ 01 ” S, 70 ° 57 ’ W, 3770 – 3806 m deep): 1 spec. (USNM 55506, paratype), coll. University of Southern California (Department of Zoology), ‘ Eltanin R / V ’, 4 Nov 1962, det. O. Hartman, 1967; Antarctica, Weddell Sea (72 ° 47 ’ 36 ” S, 30 ° 29 ’ 42 ” W, 3697 m): 1 spec. (USNM 46847), coll. University of Connecticut, ‘ Glacier II R / V ’, 14 Mar 1969, det. O. Hartman; Antarctica, Coats Land (73 ° 28 ’ 24 ” S, 30 ° 26 ’ 24 ” W, 3111 m deep): 3 specs (USNM 46846), coll. University of Connecticut, ‘ Glacier II R / V ’, 13 Mar 1969, det. O. Hartman.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B71FFBC26F1FDE8FBAA80F9.taxon	description	Description. Usually of relatively small body size, complete specimens with 11 chaetigers, largest individual analysed 4.3 mm long, 0.5 mm wide. Palps elongate, distally acute, basally fused to 1 / 2 – 3 / 4 of their lengths (Fig. 12 A – B, D – E). Prostomium ovate, conspicuously shorter than palps, wider than long (Fig. 12 A, D); eyes absent, antennae ovate, broken or missing in most specimens, median antenna inserted approximately at middle of prostomium, lateral antennae inserted more anteriorly. Peristomium shorter than anterior chaetigers, frequently densely covered by cilia, with 1 pair of small, papilliform peristomial cirri. Dorsal cirri with short cirrophores and long, slender cirrostyles often coiled over dorsum, most cirri broken or missing; dorsal cirri absent on chaetiger 2. Ventral cirri papiliform to digitiform, progressively more pyriform towards posterior body, inserted at midlength of parapodial lobes, not reaching their tips (Fig. 12 B, F). Parapodial lobes distally rounded to slightly bilobed, with posterior lobe more pronounced; dorsalmost chaetae emerging from tip of lobe, below semicircular flap located dorsally on distal half of parapodial lobe (Fig. 12 F, H), chaetae progressively inserted more basally along lobe ventralwards, with numerous rows of chaetae, especially on anterior chaetigers (Fig. 12 B, F, I). Anterior parapodia with 30 + compound chaetae each, posterior parapodia with ~ 10 – 15 chaetae each; chaetae heterogomph, with long, unidentate, finely spinulated to smooth blades (spinulation nearly inconspicuous under compound microscope); conspicuous dorso-ventral gradation in length, blades 320 – 30 µm, 450 – 30 µm and 350 – 20 µm long on anterior, mid- and posterior body chaetigers, respectively (Fig. 12 C, G). Parapodia throughout usually with 2 aciculae each, aciculae away from each other at tip of parapodium, one usually extending anteriorly and other posteriorly to chaetae, in dorsal side of parapodium, frequently with tips protruding from parapodial lobes (Fig. 12 H); aciculae subdistally slightly enlarged, distally acute. Pharynx through 2 – 3.5 chaetigers, border surrounded by ~ 10 soft, distally rounded papillae, tooth absent. Proventricle barrel- to heart-shaped, through ~ 3 chaetigers (0.2 – 0.7 mm long), with ca. 12 rows of muscle cells.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B71FFBC26F1FDE8FBAA80F9.taxon	discussion	Remarks. In the original description, this species was illustrated as having dorsal cirri on chaetiger 2 (Hartman 1967, Plate 14), although this was not mentioned in the description, and it was considered as such by Aguado & San Martín (2008). This, however, could not be confirmed in any of the specimens herein analysed, including the holotype and paratypes. Therefore, we amend the description of the species, to state that dorsal cirri are absent on chaetiger 2. Anguillosyllis palpata differs from A. pupa as this latter species has completely or almost completely fused palps and proventricle with 20 – 25 rows of muscle cells, while in A. palpata the proventricle has 12 rows of muscle cells. Anguillosyllis palpata also differs from A. capensis, as this species has more rows of muscle cells in the proventricle (30 rows) and parapodial lobes with distinctly larger, elongate post-chaetal lobes (see Aguado & San Martín 2008, Fig. 1).	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B71FFBC26F1FDE8FBAA80F9.taxon	description	Geographic distribution and bathymetric range. South Atlantic Ocean — Argentina (Cape Horn – type locality, 384 – 494 m deep); Brazil (Campos and Espírito Santo basins, 393 – 3028 m deep). South Pacific Ocean — Chile (3770 – 3806 m deep). Antarctic Ocean — Weddell Sea (3111 – 3697 m deep).	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B73FFB126F1FCBDFBED8619.taxon	materials_examined	Type material. Project ‘ Habitats ’. Holotype (MNRJP 1186): 22 ° 49 ’ 22 ” S, 40 ° 8 ’ 19 ” W, 1864 m, 11 May 2008; Project ‘ Ambes ’: Paratype (ZUEC POL 19880): 19 ° 42 ’ 01.8 ” S, 39 ° 22 ’ 21.4 ” W, 1333 m.). Material examined. Project ‘ Habitats ’: 23 ° 25 ’ 19 ” S, 40 ° 35 ’ 37 ’ W, 2491 m: 1 spec. (MZUSP 2947), 17 Feb 2009; 23 ° 3 ’ 34 ” S, 40 ° 41 ’ 55 ” W, 1285 m: 1 spec. (MZUSP 2945), 16 Jan 2009; 23 ° 8 ’ 25 ” S, 40 ° 36 ’ 40 ” W, 1954 m: 1 spec., 27 Jan 2009. Project ‘ AMBES ’: 19 ° 3 ’ 13 ” S, 37 ° 45 ’ 37 ” W, 2426 m: 3 specs (MZUSP 2919), 6 Dec 2011; 19 ° 3 ’ 45 ” S, 37 ° 47 ’ 28 ” W, 1928 m: 3 specs (MZUSP 2935), 29 Jan 2012; 19 ° 3 ’ 55 ” S, 37 ° 45 ’ 8 ” W, 2993 m: 1 spec. (MZUSP 2920), 5 Dec 2011; 19 ° 3 ’ 55 ” S, 39 ° 45 ’ 8 ” W, 2993 m: 2 specs (ZUEC 19884), 5 Dec 2011; 19 ° 40 ’ 8 ” S, 39 ° 7 ’ 22 ” W, 1035 m: 1 spec., 13 Dec 2011; 20 ° 25 ’ 16 ” S, 39 ° 27 ’ 20 ” W, 1918 m: 2 specs (MZUSP 2931), 7 Jan 2012; 20 ° 29 ’ 3 ” S, 38 ° 23 ’ 15 ” W, 2504 m: 3 specs (MZUSP 2923), 22 Dec 2011; 20 ° 41 ’ 33 ” S, 39 ° 35 ’ 14 ” W, 1914 m: 2 specs (MZUSP 2921), 27 Dec 2011; 20 ° 49 ’ 23 ” S, 38 ° 17 ’ 11 ” W, 2997 m: 2 specs (MZUSP 2922), 23 Dec 2011; 20 ° 54 ’ 14 ” S, 38 ° 56 ’ 10 ” W, 2519 m: 1 spec. (MZUSP 2930), 4 Jan 2012; 20 ° 8 ’ 42 ” S, 39 ° 7 ’ 29 ” W, 1922 m: 1 spec. (MZUSP 2933), 6 Jan 2012; 20 ° 8 ’ 45 ” S, 39 ° 7 ’ 31 ” W, 1927 m: 5 specs (MZUSP 2954), 16 Jun 2013; 21 ° 36 ’ 42 ” S, 39 ° 49 ’ 25 ” W, 1333 m: 6 specs (MZUSP 2926), 8 Jan 2012; 21 ° 4 ’ 51 ” S, 40 ° 4 ’ 14 ” W, 1300 m: 4 specs (MZUSP 2924 m), 31 Dec 2011; 21 ° 6 ’ 30 ” S, 39 ° 38 ’ 36 ” W, 1889 m: 2 specs (MZUSP 2925), 31 Dec 2011; 21 ° 6 ’ 38 ” S, 39 ° 38 ’ 31 ” W, 1889 m: 1 spec. (MZUSP 2928), 9 Jun 2013; 21 ° 9 ’ 39 ” S, 38 ° 52 ’ 7 ” W, 2502 m: 1 spec. (MZUSP 2929), 10 Jun 2013; 22 ° 49 ’ 22 ” S, 40 ° 8 ’ 19 ” W, 1864 m: 1 spec., 11 May 2008. Additional material examined: Anguillosyllis capensis — South Africa, off Cape Province (34 ° 51 ’ S, 23 ° 41 ’ E, 183 m deep): 1 spec. (BMNH 1963.1. 29, holotype), coll. J. H. Day, 30 Nov 1960, det. J. H. Day, 1963. Braniella pupa — USA, off New England: 1 spec. (ZMH P- 13585, paratype?), coll. Allan Hancock Foundation, det. Hartman & Fauchald, 1971; USA, off Delaware (38 ° 44 ’ 36 ” N 73 ° 03 ’ 06 ” W, 183 m deep): 1 spec. (USNM 56762), coll. “ VIMS for BLM / MMS ”, 19 Mar 1976, det. G. R. Gaston; USA, Georges Bank, Northern Slope (41 ° 33 ’ 26 ” N 68 ° 58 ’ 36 ” W, 117 m deep): 1 spec. (USNM 103505), coll. BLM / MMS, 27 Feb 1977, det. University of Delaware.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B73FFB126F1FCBDFBED8619.taxon	description	Description. Fragile bodies, usually missing antennae and most cirri, complete specimens with 10 chaetigers, largest specimen examined complete, 2 mm long, 0.2 mm wide. Palps elongate, distally acute, completely fused or with only minute distal notch, occasionally with faint line of fusion. Prostomium ovate, broader than long; eyes absent, antennae cirriform to ovoid (Fig. 13 A – B; 14 A). Peristomium shorter than subsequent segments, with 1 pair of ovate, papilliform peristomial cirri, smaller than lateral antennae (Fig. 13 A – B; 14 A). Dorsal cirri long, slender, often coiled over dorsum, most cirri broken or missing, not present on chaetiger 2 (Fig. 13 A, I), frequently only cirrophores left; parapodial glands as slightly swollen areas dorsally, close to bases of dorsal cirri, with granular material of unknown nature, approximately rounded to polyhedral under SEM (Fig. 13 A, H; 14 A, F – G). Ventral cirri digitiform, inserted at mid-length of parapodial lobes, not reaching tip (Fig. 14 B). Parapodia distally rounded to weakly bilobed, in such case posterior lobe progressively slightly larger towards posterior body, or only short, nearly inconspicuous posterior lobe present. Anterior and midbody parapodia with ~ 15 compound chaetae each, posterior body with ~ 5 – 10 compound chaetae each; chaetae heterogomph, with long, unidentate, finely spinulated to smooth blades (spinulation nearly inconspicuous under compound microscope); conspicuous dorso-ventral gradation in length, blades 160 – 7 µm, 170 – 30 µm and 170 – 20 µm long on anterior, mid- and posterior body chaetigers, respectively (Fig. 13 E – G; 14 C – D). Parapodia throughout usually with 2 aciculae each, aciculae away from each other at tip of parapodium, one usually extending anteriorly and other posteriorly to chaetae, frequently with tips protruding from parapodial lobes (Fig. 13 D); aciculae subdistally slightly enlarged, distally acute (Fig. 14 E). Pharynx through 1.5 – 2 chaetigers, border surrounded by ~ 10 soft, elongate, digitiform papillae (Fig, 13 C), tooth absent. Proventricle barrel-shaped to heart-shaped, through 2.5 – 3 chaetigers (0.25 – 0.35 mm long), with ca. of 12 rows of muscle cells (Fig. 14 A).	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B73FFB126F1FCBDFBED8619.taxon	discussion	Remarks. Anguillosyllis lanai sp. nov. has completely fused palps, parapodial lobes distally rounded, bilobed or with posterior lobe only, and structures near parapodial bases which we consider as parapodial glands, because their location is in agreement with parapodial glands found in other species of syllids. The species most similar morphologically to A. lanai sp. nov. is A. pupa, since both species have completely or nearly completely fused palps and ventral cirri inserted at mid-length of parapodial lobes. However, A. lanai sp. nov. differs from A. pupa as this latter species has a proventricle with 20 – 25 rows of muscle cells (against ~ 12 rows as in A. lanai sp. nov.); and post-chaetal lobes conspicuously larger than in A. lanai sp. nov. (see Hartman 1965, Pl. 8; Aguado & San Martín 2008, Fig. 2 A – B). Anguillosyllis lanai sp. nov. also differs from A. capensis, since in that species the proventricle presents more rows of muscle cells (30 rows), and the parapodial lobes have distinctly larger, elongate post-chaetal lobes (see Aguado & San Martín 2008, Fig. 1). Finally, A. lanai sp. nov. differs from A. palpata because the latter species presents palps separated from each other for at least half of their length, longer blades of compound chaetae (up to 450 µm long, as opposed to 170 µm long, as in A. lanai sp. nov.), and by the adults of that species having 11, instead of 10 chaetigers, as in A. lanai sp. nov. Geographic distribution and bathymetric range. Anguillosyllis lanai sp. nov. was found in Campos and Espírito Santo basins, between 1035 – 2997 m deep.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
03CD87F52B73FFB126F1FCBDFBED8619.taxon	etymology	Etymology. This species is dedicated to Paulo Lana, responsible for an enormous increase in the knowledge of marine invertebrates, especially polychaetes, inspiring new generations of researchers.	en	Barroso, Rômulo, Paiva, Paulo Cesar De, Nogueira, João Miguel De Matos, Fukuda, Marcelo Veronesi (2017): Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa 4221 (4): 401-430, DOI: 10.5281/zenodo.252007
