taxonID	type	description	language	source
333F6A55FF8DB969FF38F8792E26FD05.taxon	diagnosis	Diagnosis Trichobranchidae with compact prostomium fused to free frontal edge of the peristomium. Peristomium forming lips, upper lip typically hidden, lower lip expanded. Branchial stems fused, branchiae forming single, lamellate structure on mid-dorsum, made up of 1 to 4 lobes, sometimes an anterior prolongation of lobes (fifth lobe) present. Eyespots absent. Thorax with 18 pairs of notopodia from segment 3 and neuropodia from segment 7 (chaetiger 5) or segment 8 (chaetiger 6) to pygidium. Notochaetae all capillaries with varying degrees of ornamentation. First, and sometimes second thoracic neuropodia with smooth, geniculate hooks, subsequent thoracic ones with denticulate hooks. Abdominal uncini avicular.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF8DB969FF38F8792E26FD05.taxon	discussion	Remarks: We have amended the diagnosis of the genus to include species with two rows of thoracic neuropodial hooks. At this stage we prefer to do this rather than erect a new genus until a detailed phylogenetic study of the family is undertaken.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF82B96AFF38F96928A6F9C9.taxon	materials_examined	Holotype: ANDEEP III, St. 74 - 6, EBS (ZMH- 26017) Paratypes: ANDEEP III, St. 121 - 10, GKG (ZMH- 26011); ANDEEP III, St. 121 - 10, GKG [drawing] (ZMH- 26012); ANDEEP III, St. 150 - 3, GKG [drawing, MG photo] (AM W 39666); ANDEEP III, St. 150 - 3, GKG [drawing, MG photo, SEM, stub MI 583] (AM W 38717); ANDEEP III, St. 74 - 6, EBS (3 specimens, ZMH- 26018, ZMH- 26019, ZMH- 26020); ANDEEP III, St. 150 - 6, EBS [SEM, stub MI 490 & MI 491] (AM W 38718); ANDEEP III, St. 150 - 6, EBS (2 specimens, AM W 39667, AM W 39668); ANDEEP II, St. 46 - 7, EBS (ZMH- 26031). Description: (Based on both holotype and paratypes). Holotype: 12 mm in length, 2 mm in width, posteriorly incomplete with 8 abdominal chaetigers. Paratypes range in length from 4 – 6 mm in length and 1 to 1.5 mm in width, all posteriorly incomplete, some with a few abdominal chaetigers, majority with only thoracic chaetigers. Head region: Tentacular membrane expanded and folded. Lower lip rectangular, expanded and folded upwards with a smooth rim. Tentacles either only short simple ones present on outer margins of tentacular membrane (Fig. 3 A, B), or numerous long tentacles with expanded tips (Fig. 4 A, D). Branchiae: Branchial lobes fused to about 50 %, lamellae broad, but numerous and compact, without distinct filamentous tips (Figs 3 C, D, 4 A, B). Posterior branchial lobes shorter (about 80 % of anterior ones). Fifth branchial lobe absent. No evidence of ciliary fields between lamellae (Fig. 4 C). Annulation of branchial stem present, stem rather long and flattened (Fig. 3 C). Possibly juvenile branchial development with drop-shaped branchiae arranged at 120 ° angle to each other on one specimen (Figs 3 D, 5 F). Anterior chaetigers: Notopodia from segments 3 – 20, 18 pairs. First notopodia reduced in size compared to subsequent notopodia with chaetae more or less originating from body wall. Notochaetae, capillaries varying in length within fascicle (Fig. 4 D). Neuropodia present from segment 8, those of TC- 6 (chaetiger 6) geniculate hooks, about 7 – 9 per side, strongly bent with long extended fine tips (Fig. 4 E). Subsequent neuropodia with long shafted denticulate hooks with main fang and several rows of teeth above, not vertically aligned, so providing a dental formulae not possible (Fig. 4 G, H). Uncini arranged in single rows although may be irregular (Fig. 4 F) so as to appear as arranged in double rows. Abdominal uncini with numerous rows of elongate teeth extending to tip of uncinus covering the main fang (Fig. 4 H). Lateral lappets: Present from TC- 1 – 7, with TC- 1 = 2 = 3 = 4> 5 <6> 7 (Figs 3 A, B, 4 D). Ventral pads: Ventrum of thoracic segments strongly glandular with anterior margins of segments elevated, especially marked on chaetigers 1 – 4. Nephridial papillae: Present on segments 3, 5, 6, 7, small globular slightly elongate (Fig. 5 E). MG staining pattern 8 (Figs 2, 5): Solid to about TC- 11 or - 12, few subsequent segments with distinct stripes. No distinct white bands or pronounced anterior margins present, noto- and neuropodia stain. Pygidium: Unknown.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF82B96AFF38F96928A6F9C9.taxon	discussion	Remarks: Terebellides canopus sp. n., is characterised by having a lower lip with smooth margin, branchial lobes at least partially fused along their length with lamellae densely packed, a single row of thoracic geniculate hooks and subsequent uncini arranged in single and sometimes in double rows. This new species resembles T. toliman sp. n., (this paper) as it also lacks the 5 th branchial lobe, and branchiae are equipped with numerous branchial lamellae, densely packed, all lobes lacking filamentous tips, but can be easily separated by the shape of the nuchal hooks and by the development of lateral lappets. They are present to the 6 th thoracic chaetiger in T. toliman sp. n., (this paper) and the 7 th in T. canopus sp. n. The geniculate hooks are strongly bent in T. canopus sp. n., and weakly bent in T. toliman sp. n. Other species with partially fused branchial lobes with numerous lamellae include Terebellides californica Williams, 1984, Terebellides horikoshii Imajima & Williams, 1985, and Terebellides japonica Moore, 1903, but these all have lateral lappets only until the 5 th thoracic chaetiger. For further details see the key. Habitat: Known only from the eastern and western Weddell Sea continental slope to upper abyss and the Drake Passage in 1047 – 2621 m.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF82B96AFF38F96928A6F9C9.taxon	etymology	Etymology: The specific name canopus is the brightest star in the constellation Carina.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF81B96EFF38F9592862FEAD.taxon	materials_examined	Holotype: ANDEEP III, St. 121 - 11, EBS (ZMH- 26027) Paratypes: ANDEEP II, St. 132 - 6, GKG [drawing, MG photo] (ZMH- 26008); ANDEEP III, 110 - 8, EBS (ZMH- 26026); ANDEEP III, St. 121 - 11, EBS (5 specimens, AM W 39656, AM W 39996, AM W 39657, AM W 39658, AM W 39659); ANDEEP III, St. 121 - 11, EBS [SEM, stub MI 496] (AM W 38714); ANDEEP III, St. 16 - 10, EBS (ZMH- 26028); ANDEEP III, St. 78 - 9, EBS (2 specimens, ZMH- 26029, ZMH- 26030) Description: (Based on both holotype and paratypes) Holotype, 7 mm in length, 0.5 mm in width, posteriorly incomplete. Paratypes ranging from 6 – 8 mm in length, 0.5 – 1.0 mm in width, majority posteriorly incomplete. Complete specimens with up to 35 abdominal chaetigers. Head region: Tentacular membrane compact, not greatly expanded. Lower lip rectangular, distinctly folded upwards with smooth rim (Fig. 6). Tentacles only short, thick, wrinkled, present on outer margins of tentacular membrane in some specimens (Fig. 6), others with long numerous tentacles of two types (simple and with expanded tips) (Fig. 7 A – C, E). Branchiae: Lobes lost with only stem present on holotype, but part of lobes present in paratypes (Fig. 7 A). Thick wrinkled stem with lobes with few short compact lamellae (Fig. 7 A – C), ciliary fields present between lamellae (Fig. 7 D). Lobes free from each other, all of similar size, with distinct filamentous tip (Fig. 7 B, C). Anterior chaetigers: Notopodia from segment 3, 18 pairs. Chaetiger 1 reduced in size with chaetae more or less originating from body wall and more dorsally aligned than subsequent ones (Fig. 7 A, F). Following chaetigers with elongate rectangular notopodia with elongate capillary notochaetae, numbering 6 – 8 per podium arranged in two tiers (Fig. 7 A, F); capillaries with fine pointed tips, thecae with flared tips (Fig. 7 F). Neuropodia from segment 7 (chaetiger 5). First neuropodia with 3 curved hooks with extended pointed tips (Fig. 7 G). Segment 8 (chaetiger 6) with 4 curved hooks (Fig. 7 G). Subsequent neuropodia with 3 or more long shafted denticulate hooks with main fang and several multidentate rows of teeth above, not vertically aligned (Fig. 7 H) so providing a dental formulae not possible. Lateral lappets: Present from thoracic segments 1 – 6, with thoracic chaetigers TC- 1 = 2 <3> 4 = 5 = 6 (Figs 6, 7 E). Ventral pads: Ventrum glandular, segments 2 and 3 narrow, width of ventrum increasing on segments 4 - 6, with anterior margins expanded forming thickened membraneous collars (Fig. 7 E). Subsequent segments narrow ventrally with anterior margins forming thickened collars (Fig. 7 E). Nephridial papillae: Present on segments 3, 6, 7 (Fig. 7 A). MG staining pattern 1 (Figs 2, 8): With anterior segments solidly stained and striped median thoracic segments. Distinct white bands or pronounced anterior margins of segments lacking; noto- and neuropodia stain. Pygidium: Rounded blunt cone without appendages.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF81B96EFF38F9592862FEAD.taxon	discussion	Remarks: This new species is characterised by having the first two rows of neuropodia with geniculate hooks starting on chaetiger 5, a character only known for three other species of the genus: T. biaciculata Hartmann- Schröder, 1992, T. bigeniculatus Parapar, Moreira & Helgalson, 2011 and T. intoshi Caullery, 1915. According to Imajima and Williams (1985) in T. intoshi geniculate hooks are present in chaetigers 6 and 7 as opposed to chaetigers 5 and 6 in the other three species, this trait was however not mentioned in the original description by Caullery (1915). Terebellides crux sp. n., clearly differs from T. biaciculata and T. bigeniculatus by its branchial lobes, which are free and all of equal length in T. crux sp. n., and partially fused with distinctly larger anterior lobes than posterior lobes in T. biaciculata and T. bigeniculatus. All other described species of Terebellides have neuropodia starting in chaetiger 6 and only the first neuropodia with geniculate hooks, the remaining with long shafted denticulate hooks. This has necessitated the modification of the generic diagnosis which we have preferred to do rather than erecting a new genus at this stage. Habitat: South eastern South Atlantic and Weddell Sea deep waters in 2086 – 4720 m.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF81B96EFF38F9592862FEAD.taxon	etymology	Etymology: The species name crux is an alternative name for the Southern Cross.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF85B973FF38FE7B2802FD85.taxon	materials_examined	Holotype: ANDEEP II, St. 133 - 5, GKG [drawing, MG photo] (ZMH- 26009) Paratype: ANDEEP II, St. 133 - 5, GKG [MG photo, SEM, stub MI 539 & MI 540] (AM W 38719) Description: (Based on both holotype and paratype) Holotype 15 mm in length, 1 mm in width, complete with 28 abdominal chaetigers (Fig. 9). Head region: Tentacular membrane largely expanded, horseshoe shaped. Lower lip rectangular, expanded, but not distinctly folded upwards. Tentacles only short and simple on the outer margins of the tentacular membrane, minute papillae apparent on tentacular membrane with MG staining. Branchiae: Branchial lobes free from each other, lamellae broad, loose, only few present, with filamentous tips. Posterior branchial lobes missing. Fifth branchial lobe absent. Annulation of branchial stem present, stem very long, longer than actual branchial lobe (Figs 9, 10 A, B, D, 11). Anterior chaetigers: Notopodia from segments 3 – 20, 18 pairs, all notopodia of similar size (Fig. 10 A). Notochaetae, capillaries, graded lengths within fascicle with slightly inflated thecae (Fig. 10 E, F). First neuropodia on thoracic segment 8 (chaetiger 6) with geniculate hooks, about 7 per side, strongly protruding, declining in size within a torus from dorsal to ventral (Fig. 10 G), curved with inflated bases and short pointed tips, base of curve with minute teeth. Subsequent neurochaetae long handled hooks with multiple teeth above a main fang in thoracic segments, and abdominal uncini numerous within a torus and with elongate hooks, main fang completely covered by numerous elongate accessory teeth (Fig. 10 H). Lateral lappets: Present from TC- 1 – 7, with TC- 1 = 3> 2 = 4> 5 = 6 = 7 or TC- 1 = 2 <3 = 4> 5 <6 = 7. Ventral pads: Ventrum glandular to chaetiger 11, distinct raised ridges extend across the ventrum with elevated anterior margins. Nephridial papillae: Present on segments 3, 4, 6, 7, elongate papillae posterior dorsal to notopodia. MG staining pattern 9 (Figs 2, 11): Anterior solidly stained with thin white “ glandular ” region lateral in segment 5 (TC- 3), TC- 4 more solidly stained than all others, striped from TC- 5 on, TC- 12 – 16 only with very fine stripe. White bands may be present in TC- 9 – 11, anterior margins not pronounced. Neuropodia not stained, notopodia can stain initially and fade quicker than remaining body. Pygidium: 2 blunt lateral papillae (Fig. 9 B).	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF85B973FF38FE7B2802FD85.taxon	discussion	Remarks: Terebellides mira sp. n., is characterised by having branchial lobes completely free of each other, all notopodia of similar size and lateral lappets on chaetiger 1 – 7 and a large number of geniculate hooks on chaetiger 6. Terebellides mira sp. n., belongs to a group of Terebellides which have the first thoracic chaetiger only slightly smaller than subsequent chaetigers but with distinct notopodial lobe present and branchial lamellae few in number and loosely packed (Terebellides lobatus Hartman & Fauchald, 1971, Terebellides diva Schüller & Hutchings, 2012 and Terebellides gingko Schüller & Hutchings, 2012), but can be distinguished from these species by having filamentous tips to the branchial lobes and lateral lappets to thoracic chaetiger 7. For more details see the key. Habitat: Western Weddell Sea upper continental slope in 1166 m. Known only from type locality.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF85B973FF38FE7B2802FD85.taxon	etymology	Etymology: The specific name mira refers to the first variable star ever discovered in the constellation Cetus which represents the Sea Monster and was discovered in 1596 by David Fabricius.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF98B974FF38FD9B2D1BFBEE.taxon	materials_examined	Holotype: ANDEEP III, St. 78 - 9, EBS (ZMH- 26023) Paratypes: ANDEEP III, St. 121 - 7, AGT [drawing, MG photo] (AM W 39660); ANDEEP III, St. 78 - 9, EBS (3 specimens, ZMH- 26021, ZMH- 26022, ZMH- 26024); ANDEEP III, St. 80 - 9, EBS (ZMH- 26025); ANDEEP III, St. 142 - 5, EBS (2 specimens, AM W 39661, AM W 39662); ANDEEP III, St. 142 - 5, EBS [SEM, stub MI 495] (AM W 38715) Description: (Based on both holotype and paratypes) Holotype 6 mm in length, 1 mm in width, posteriorly incomplete with 18 chaetigers, gravid, body cavity with oocytes. Paratypes ranging in length from 4 – 6 mm and 0.2 – 1.0 mm in width, all posteriorly incomplete, all with thorax complete but with only 0 – 5 abdominal segments. Head region: Tentacular membrane compact, with little expansion. Lower lip rectangular, only laterally slightly expanded (Figs 12, 13 A). Tentacles only short simple ones present on outer margins of tentacular membrane (Fig. 13 A, B). Branchiae: Anterior branchial lobes free from each other, lamellae broad, loose, only few present, with filamentous tips (Figs 12 A, 13 B, D). Dense ciliary fields between each of lamellae (Fig. 13 C, D). Posterior branchial lobes distinctly smaller than anterior lobes. Fifth branchial lobe absent. Annulation of branchial stem not visible. Anterior chaetigers: Notopodia from segments 3 – 20, 18 pairs. Notopodia of first and second chaetiger reduced and not horizontally aligned, those of chaetiger 2 more dorsal, chaetae appearing to arise directly from body wall (Fig. 13 A). Subsequent chaetigers with well developed notopodia increasing in size posteriorly and inserted more ventrally with pre- and post chaetal lobes similar in length. Notochaetae, fine capillaries with long extended tips (Fig. 13 E, F), shaft with expanded thecae (Fig. 13 F), arranged in two tiers, long tier with about five chaetae and short tier with four (Fig. 13 F). Neuropodia from segment 8 (chaetiger 6) present on all subsequent segments (all material posteriorly incomplete). Neurochaetae of chaetiger 6 sharply curved geniculate hooks with long, extended tips, five present (Fig. 13 G) although one represented by stub, surface of hooks appears structured. Subsequent neuropodia with long shafted denticulate hooks with main fang and several multidentate rows of teeth above, not vertically aligned, so providing a dental formulae not possible (Fig. 13 H). Lateral lappets: Present on thoracic chaetigers 1 — 4, possibly to TC- 6, with TC- 1> 2> 3> 4> 5 = 6. Ventral pads: Ventrum of thoracic segments glandular with anterior margins of segments elevated, especially marked on chaetigers 1 – 7, continue laterally to form lateral lappets on chaetigers 1 – 4 (Fig. 13 E). Nephridial papillae: Present on segments 3, 4, 6, 7. MG staining pattern 1 (Figs 2, 14): With distinctly solid anterior part and broad stripes in median and posterior segments. White band, pronounced anterior margins and neuropodial staining missing, notopodial staining only weak if present (Fig. 14). Pygidium: Unknown.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF98B974FF38FD9B2D1BFBEE.taxon	discussion	Remarks: Terebellides rigel sp. n., is characterised by having branchial lobes free from each other and each with few lamellae, distinct lateral lappets from chaetigers 1 – 4 decreasing in size posteriorly to chaetiger 6, first neuropodia with geniculate hooks only and all subsequent neuropodia with a single row of long handled hooks with strongly denticulate heads. This species can easily be separated from two widely distributed species in the region T. kerguelensis McIntosh, 1885 and T. longicaudatus Hessle, 1917 which are both characterised in having five branchial lobes and each with numerous lamellae in contrast to T. rigel sp. n. This new species belongs to a group of species with branchial lobes with few loosely packed lamellae (Terebellides banalis Schüller & Hutchings, 2012, Terebellides sepultura Garraffoni & Lana, 2003, Terebellides distincta Williams, 1984, and Terebellides irinae, Gagaev, 2009) but it can be distinguished from these by the presence of lateral lappets until thoracic chaetiger 6. For more details see the key. Habitat: Weddell Sea, lower continental slope to abyss in 2182 – 3403 m. Known only from type locality.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF98B974FF38FD9B2D1BFBEE.taxon	etymology	Etymology: The specific name rigel refers to one of the brightest stars of Orion, the most famous seasonal constellation.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF9FB979FF38F89228FFF9E6.taxon	materials_examined	Holotype: ANDEEP II, St. 132 - 6, GKG (ZMH- 26005) Paratypes: ANDEEP II, St. 132 - 6, GKG [drawing, MG photo] (ZMH- 26004); ANDEEP II, St. 132 - 6, GKG (ZMH- 26006); ANDEEP II, St. 131 - 8, GKG (AM W 39663); ANDEEP II, St. 131 - 8, GKG [MG photo, SEM, stub MI 541 & MI 542] (AM W 38716); ANDEEP II, St. 132 - 4, GKG (2 specimens, AM W 39664, AM W 39665); DZMB-HH 6309 - 1, ANDEEP III, St. 121 - 12, GKG (ZMH- 26007) Description: (Based on both holotype and paratypes) Holotype 6 mm in length, 1 mm width, complete with 35 abdominal chaetigers. Paratypes range from 6 mm to 1.2 cm in length to 1 to 1.2 mm in width with 30 to 35 abdominal chaetigers. Head region: Tentacular membrane greatly expanded. Lower lip rectangular, distinctly folded upwards, also expanded (Fig. 15). Tentacles short simple ones plus long tentacles with expanded tips present on outer margins of tentacular membrane (Fig. 16 A, D). Branchiae: Branchial lobes fused about 20 – 40 % with each other, lamellae broad, loose, rather few present, filamentous tips absent (Fig. 16 A, B). Posterior branchial lobes shorter (about 70 – 80 %) than anterior ones. Fifth branchial lobe absent. Annulation of branchial stem present. Only one specimen with fully developed branchiae, remaining specimens with anterior branchial lobes somewhat drop-like in shape, arranged at an angle of about 120 ° to each other (Fig. 17). Ciliary fields between branchial lamellae not apparent (Fig. 16 B, C). Anterior chaetigers: Notopodia from segments 3 – 20, 18 pairs. First notopodia reduced in size with chaetae more or less originating from body wall (Fig. 16 D) and second notopodia smaller than subsequent ones (Fig. 16 D). Notochaetae, capillaries with fine tips and arranged in two tiers (Fig. 16 E). Neuropodia present from segment 8 (chaetiger 6), those of first neuropodia geniculate hooks, about 5 – 7 per side, sharply bent with extended fine tips and inflated bases (Fig. 16 F). Subsequent neuropodia with long shafted denticulate hooks with main fang and several multidentate rows of teeth above, not vertically aligned, so providing a dental formulae not possible (Fig. 16 G), neuropodia become increasingly erect pinnules posteriorly. Abdominal uncini few within a torus and with elongate hooks, main fang completely covered by numerous elongate accessory teeth (Fig. 16 H). Lateral lappets: Present from TC- 1 – 6, with TC- 1> 2 = 3> 4 = 5 <6. Ventral pads: Ventrum of thoracic segments slightly glandular with anterior margins of segments elevated, especially marked on chaetigers 1 – 4. Nephridial papillae: Present on segments 3, 6, 7, possibly also 5, globular. MG staining pattern 1 (Figs 2, 17): Solid on anterior and striped in median thorax. No apparent white bands or pronounced anterior margins present. Both noto- and neuropodia stain. Pygidium: With two low lateral papillae.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF9FB979FF38F89228FFF9E6.taxon	discussion	Remarks: Terebellides sirius sp. n., is characterised by four branchial lobes being partially fused along their length, lobes made up of a few loosely packed lamellae with no terminal filamentous tips, lateral lappets on chaetigers 1 – 6 with the first three the largest and similar in size and with a greatly expanded lower lip. This new species T. sirius sp. n., belongs to a group of species with branchial lobes at least partially fused along their length (Terebellides kowinka Hutchings & Peart, 2000, Terebellides californica Williams, 1984, Terebellides horikoshii Imajima & Williams, 1985, Terebellides japonica Moore, 1903). Terebellides sirius sp. n., can be separated from T. kowinka by the branchiae lacking filamentous tips, and the other species in this group have branchiae with lamellae densely packed (T. toliman sp. n., this paper and T. canopus sp. n., this paper) whereas T. sirius sp. n., like T. kowinka has branchiae with only a few lamellae. For more details see the key. Habitat: Western Weddell Sea in 2085 – 3068 m. Known only from type locality.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF9FB979FF38F89228FFF9E6.taxon	etymology	Etymology: The specific name sirius is one of the brightest stars in the constellation Carina.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF92B97AFF38F93C2E69FACE.taxon	materials_examined	Holotype: ANDEEP-SYSTCO, St. 16 - 1, RD (ZMH- 26016) Paratype: ANDEEP-SYSTCO, St. 16 - 1, RD [SEM, stub MI 566 & MI 567] (AM W 38720) Description: (Based on both holotype and paratype) Holotype in two pieces, anterior part 22 mm in length, 4 mm in width, for 16 chaetigers, posterior part 23 mm in length, 2 mm in width, for 37 uncinigerous segments, extreme posterior missing. Body robust, colour preserved pale cream. Head region: Prostomium with fleshy and markedly expanded tentacular membrane with curved glandular slightly folded margins, internal walls, corrugated and glandular. Tentacles numerous, of two kinds: short, uniform in thickness ones and long ones with expanded tips (Figs 18, 19 A – C). Peristomium consisting of an upper lip and compact lower lip. Segment 2, glandular and expanded ventrally, visible ventrally and laterally, dorsally as narrow ring (Fig. 19 C). Branchiae: Stalk stout and short, weakly annulated (Fig. 18). Four branchial lobes, almost completely fused together except for proximal quarter of lobe, without filamentous tips (Fig. 19 B). Anterior two lobes largest, with compact numerous lamellae (Fig. 19 A). Anterior chaetigers: Notopodia from segment 3, only 17 pairs present, (posterior thorax missing, so suggest that 18 originally present). First five notopodia smaller than subsequent ones, first three pairs more ventrally displaced, first chaetiger very small with poorly developed chaetal lobes and chaetae appearing to arise directly from body wall (Figs 18, 19 A). Posterior notopodia more erect than anterior ones, marked from chaetiger 4 onwards. Notochaetae, capillaries, graded in length within fascicle, with inflated thecae (Fig. 19 D). First neuropodia on chaetiger 6, 6 smooth spines, only weakly bent (about 120 °) (Fig. 19 E). Thoracic neuropodia sessile pinnules, but posteriorly become increasingly erect, and on posterior abdominal segments form inverted triangular erect pinnules. Thoracic neuropodia from chaetiger 7 with uncini arranged in several rows (about 3), long shafted, denticulate with long and stout main fang and several multidentate rows of teeth above, not vertically aligned, so providing a dental formulae not possible (Fig. 19 F, G). Abdominal uncini numerous within a torus and with elongate main fang and two to three rows of 4 – 5 elongate accessory teeth, head with unsorted multiple denticles (Fig. 19 H). Lateral lappets: Present from TC- 1 – 6, with TC- 1> 2> 3> 4 = 5 <6. Ventral pads: Entire ventrum glandular, individual pads separated by non-glandular intersegmental rings. Nephridial papillae: None visible in holotype, but nephridial pores present, present in paratype on segments 3, 5, 6, 7, accentuated by methyl green staining. MG staining pattern of thorax resembles pattern 8 (Figs 2, 20): Anterior ventrum of thorax darkly stained with only narrow white bands between each segment. Between chaetigers 11 – 14, distinct white bands connecting notopodia (Fig. 20 A). Staining posteriorly not fading, but mid ventral glandular stripe stained as well as neuropodial tori (Fig. 20 B), lateral margins of branchiae also stained. Pygidium: Unknown.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF92B97AFF38F93C2E69FACE.taxon	discussion	Remarks: Terebellides toliman sp. n., is characterised by four pairs of branchiae partially fused along their length, with filamentous tips absent, composed of densely packed lamellae, with lateral lappets continuing until thoracic chaetiger 6 and geniculate hooks weakly bent. This new species most closely resembles T. canopus sp. n., (this paper) but can be separated by the shape of the geniculate hooks. Other species with four branchial lobes, partially fused, and densely packed lamellae include T. horikoshii Imajima & Williams, 1985 and T. japonica Moore, 1903, which both differ from T. toliman sp. n., by having lateral lappets until chaetiger 5 only. Terebellides horikoshii in addition has notopodia of chaetigers 1 and 2 well developed whereas in T. toliman sp. n., they are poorly developed. For details on other species see the key. Another distinguishing character is that this species has reached a much greater size than any other species described, and is the only species collected on the one shelf station in this paper or by Schüller and Hutchings (2012). Habitat: Eastern Weddell Sea shelf in 486 – 488 m. Known only from type locality.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF92B97AFF38F93C2E69FACE.taxon	etymology	Etymology: The specific name toliman refers to the brightest star in the Centaurus, it is the third brightest star in the sky and the closest star to the Sun.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF96B97CFF38FF6A297FFDAE.taxon	materials_examined	Material examined: ANDEEP II, St. 133 - 5, GKG 54 (ZMH- 26010)	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF96B97CFF38FF6A297FFDAE.taxon	description	Description: Single specimen 7 mm in length, 1.6 mm in width, posteriorly incomplete with 18 thoracic chaetigers. Head region: Tentacular membrane largely expanded and folded. Lower lip rectangular, distinctly expanded. Tentacles only numerous short simple ones on the outer margins of tentacular membrane present (Fig. 21). Branchiae: Branchial lobes free from each other, lamellae broad, loose, with filamentous tips. Posterior branchial lobes smaller than anterior ones (Fig. 22 A). Fifth branchial lobe absent. Annulation of branchial stem not determinable, possibly present. Anterior chaetigers: First chaetiger’s notopodia somewhat reduced in size with chaetae more or less originating from body wall (Figs 21, 22 A, B). Geniculate hooks present on TC- 6 (segment 8) only. About 5 per side, strongly protruding, sharply bent (Fig. 22 C). Lateral lappets: Present from TC- 1 – 7, with TC- 1 = 3> 2> 4 = 5 = 6> 7 (Fig. 21). Ventral pads: Entire ventrum glandular, individual segments well differentiated with elevated anterior margins to each segment, segments 3 and 4 larger than subsequent ones. Nephridial papillae: Segments 3, 6, 7. MG staining pattern 5 (Figs 2, 22): With “ glandular ” white field in TC- 3 (segment 5), anterior segments solid, striped from about TC- 8. Notopodia stain, while neuropodia do not. White bands absent, anterior margins of TC- 3 and TC- 4 somewhat darker than those of other segments. Pygidium: Unknown.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF96B97CFF38FF6A297FFDAE.taxon	discussion	Remarks: This species is characterised by having a compact and broad thorax, and resembles shallow water species examined by both authors. However, if differs from other described species in the region by having stout branchiae and the observed methyl green staining pattern 5 .. Habitat: Western Weddell Sea upper continental slope in 1166 m. Known only from a single specimen.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF97B97CFF38FD722E60F82E.taxon	materials_examined	Material examined: DZMB-HH 6071, ANDEEP I, St. 46 - 5, GKG (ZMH- 26013)	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF97B97CFF38FD722E60F82E.taxon	description	Description: Single specimen 5 mm in length, 5 mm in width, complete with 18 thoracic chaetigers and 22 abdominal uncinigers. Head region: Tentacular membrane compact, but expanded and folded. Lower lip rectangular, distinctly smaller compared to tentacular membrane. Tentacles short simple ones on outer margins of tentacular membrane and longer ones with expanded tips present (Fig. 23). Branchiae: Branchial lobes lost. Annulation of branchial stem not determinable. Anterior chaetigers: First notopodial chaetiger reduced in size with chaetae more or less originating from body wall. Geniculate hooks: Present on TC- 6 (segment 8) only, sharply bent. Lateral lappets: Present from TC- 1 – 6 or - 7, with TC- 1 = 2 = 3> 4 <5 = 6 (= 7?). Ventral pads: Chaetigers 1 – 5 forming distinct ventral glandular collars with anterior margins elevated, wider than following chaetigers which are not as glandular and with compact anterior margins. Nephridial papillae: Segments 3, 6, 7. MG staining pattern 1 (Figs 2, 24): more or less striped throughout, no staining from TC- 13. Anterior margins of TC- 1 and - 2 darker than subsequent, white bands absent (Fig. 24 B). Noto- and neuropodia stain. Pygidium: 2 low and blunt lateral papillae.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FF97B97CFF38FD722E60F82E.taxon	discussion	Remarks: The species differs from all other species described from the region by having a stout lower lip which is short and rectangular and very inconspicuous compared to other known species of Terebellides. Habitat: Drake Passage, in 2894 m.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FFAAB941FF38FF6A2E60FB50.taxon	materials_examined	Material examined: DZMB-HH 6075, ANDEEP I St. 46 - 3, GKG (ZMH- 26014)	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FFAAB941FF38FF6A2E60FB50.taxon	description	Description: Single individual 20 mm in length, 1.7 mm in width, complete with 18 thoracic chaetigers and 29 abdominal uncinigers. Head region: Tentacular membrane compact, not largely expanded, small compared to lower lip, with reddish dots at its base (Fig. 25 A). Lower lip rectangular, slightly expanded. Tentacles short simple ones on outer margins of tentacular membrane and few longer ones with expanded tips present (Figs 25 B, 26 A, C – E). Branchiae: Three branchial lobes present, all of similar length, free from each other, lamellae broad, but compactly packed, distinctly triangular in shape, with filamentous tips (Fig. 25 A, C). Fifth branchial lobe absent. Annulation of branchial stem present. Anterior chaetigers: First chaetiger’s notopodia reduced in size with chaetae more or less originating from body wall. Subsequent notopodia very elongate with pre and post chaetal lobes equal in length. Geniculate hooks: Present on TC- 6 (segment 8) only. About 8 per side, sharply bent. Lateral lappets: Distinct, present from TC- 1 – 6, with TC- 1 = 2 = 3> 4 = 5 = 6 (Fig. 26 A, C). Ventral pads: Chaetigers 1 – 3 with large ventral pads with elevated anterior margins appearing slightly crenulated. Following two chaetigers, 4 and 5 much narrower, with anterior margins not elevated. Subsequent thoracic chaetigers wider and less glandular than 1 – 3, without elevated anterior margins. Nephridial papillae: Possibly present in segments 3, 6, 7. MG staining pattern: Very conspicuous (Figs 25 D, E, 26). Solid to TC 4, then striped to about TC- 10 / - 11, glandular fields lateral on TC- 1, - 2 & - 3, largest in TC- 3, smallest in TC- 1. Anterior margins of TC- 1 – 4 darker stained than others, possibly with a white band in TC- 1. Noto- and neuropoda stain as well. Abdominal segments with lateral stripes through the parapodia giving the abdomen a zebra-like appearance. Pygidium papillae brightly stained. Pygidium: 2 lateral papillae.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FFAAB941FF38FF6A2E60FB50.taxon	discussion	Remarks: This species differs from all species described from the region by its very conspicuous methyl green staining. It also possesses a tentacular membrane which is relatively small and small, branchial lamellae that are triangular in cross-section. Habitat: Drake Passage, in 2888 m.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FFAAB943FF38F8AD2EE0FC7E.taxon	materials_examined	Material examined: DZMB-HH 6136, ANDEEP II St. 138 - 10, GKG (ZMH- 26015) Description: Single individual 8 mm in length, 0.6 mm in width, incomplete with 18 thoracic chaetigers and about 15 abdominal chaetigers. Head region: Tentacular membrane folded, expanded, and somewhat erect on dorsum of head region, reminiscent of an anemone (Figs 27, 28 E, F). Lower lip rectangular, folded upwards, laterally expanded but rather narrow anteriorly. Tentacles short simple ones and long ones with expanded tips present underlining the appearance of an anemone. Branchiae: Three branchial lobes present (uncertain if fourth one is lost or only three present), all of similar length, posterior one slightly shorter, free from each other, lamellae broad, but compact, with very long fleshy filamentous tips (Fig. 27 A). Annulation of branchial stem not determinable. Anterior chaetigers: First chaetiger’s notopodia only slightly reduced in size. Geniculate hooks: Present on TC- 6 (segment 8) only. About 4 or 5 per side, hardly protruding but with very prolonged tips. Lateral lobes: Present from TC- 1 – 9, with TC- 1 = 2 = 3> 4 = 5> 6 = 7 <8 = 9 (Fig. 27 B). Ventral pads: Chaetigers 1 – 5 with glandular pads with elevated anterior margins, forming collars, chaetiger 6 much wider almost bell shaped, subsequent chaetigers narrower but still with elevated anterior margins. All strongly connected to the glandular areas surrounding the notopodia. Nephridial papillae: Unkown. MG staining pattern 1: Anterior solid to TC- 4, striped from there. White bands and pronounced anterior margins absent. Noto- and neuropodia stain (Fig. 28). Pygidium: Unknown.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
333F6A55FFAAB943FF38F8AD2EE0FC7E.taxon	discussion	Remarks: This species is characterised by having an erect tentacular membrane, positioned dorsally on head region, lower lip very small, rectangular. Distinct lateral lappets from chaetiger 1 – 9, those of chaetigers 8 – 9 earshaped, larger than those of chaetigers 6 – 7 (Fig. 28 D). Habitat: Weddell Sea abyssal plain, in 4537 m.	en	Schüller, Myriam, Hutchings, Pat (2013): New species of Terebellides (Polychaeta: Trichobranchidae) from the deep Southern Ocean, with a key to all described species. Zootaxa 3619: 1-45, DOI: 10.11646/zootaxa.3619.1.1
