taxonID	type	description	language	source
03C887AFFFD04609FDE86AD0415FFE76.taxon	type_taxon	Type species	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFD04609FDE86AD0415FFE76.taxon	discussion	Remarks Nereidids with pharynx armed with conical paragnaths on maxillary and oral rings, some species with bar-shaped paragnaths on Area IV, with transverse bars on Area VI (in a variable number), short or long. Notopodia with homogomph spinigers, neuropodia with homogomph and heterogomph spinigers and heterogomph falcigers with short and long blades. Perinereis has been divided into informal groups and subgroups depending on the ornamentation in Area VI of the pharynx, as well as on the development of the dorsal ligule of the posterior notopodia (Hutchings et al. 1991). Recently, Villalobos-Guerrero (2019) included novel diagnostic characters of the marks in the pharynx between the right and left Area VI and Area V. In addition, he re-described and included in Perinereis two species previously included in Nereis and Neanthes Kinberg, 1865. Villalobos-Guerrero et al. (2021) reviewed the species of Group 2 of Perinereis (which present two bars in Area VI), and transferred three species to Perinereis. A recent contribution by Teixeira et al. (2025) included the descriptions of 13 new species, increasing their number to 89 species, being the second largest genus of Nereididae in number of species.	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFD04609FDE86AD0415FFE76.taxon	distribution	Distribution The species of Perinereis are mainly distributed in the intertidal to the subtidal zone, in tropical to temperate localities in soft bottoms, inhabiting among sessile organisms, fissures between rocks, between patches of mytilid mollusks, or other sessile organisms. The deepest species recorded is from deep waters off Greece, Perinereis tenuisetis Fauvel, 1915, collected in a depth of 3848 m (Faulwetter et al. 2017).	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFD14603FDC16FA84147F9AC.taxon	description	Fig. 1	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFD14603FDC16FA84147F9AC.taxon	diagnosis	Diagnosis Perinereis with posterior eyes completely exposed; tentacular belt 1.4 × as long as first chaetiger; longest tentacular cirri reaching chaetigers 6 – 11; jaws with 3 – 5 teeth; pharyngeal area VI with shield-shaped bars, areas VII – VIII with 21 – 26 paragnaths in three transverse rows; posterior parapodia with enlarged glandular masses along dorsal ligules bases.	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFD14603FDC16FA84147F9AC.taxon	etymology	Etymology The species is named after Dr Stéphen Hourdez in recognition of his contributions on polychaetes, especially of those of hydrothermal vents, and because he participated in the expedition to Clipperton Island and collected part of the specimens for describing this species.	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFD14603FDC16FA84147F9AC.taxon	materials_examined	Type material Holotype FRANCE • mature ♀ (complete spec.); Clipperton Island, stn 33; 10 ° 18.27 ′ N, 109 ° 14.00 ′ W; depth 1 m, platform; 25 Jan. 2005; L. Albenga and L. Dugrais leg.; MNHN IA- 2000 - 2107. Paratypes FRANCE • 3 ♀♀ (1 complete and 2 incomplete specs); Clipperton Island, stn 33; 10 ° 18.27 ′ N, 109 ° 14.00 ′ W; depth 1 m, platform; 25 Jan. 2005; L. Albenga and L. Dugrais leg.; UANL 8292 • 3 ♀♀ (1 complete and 2 incomplete specs); Clipperton Island, stn 33; 10 ° 18.27 ′ N, 109 ° 14.00 ′ W; depth 1 m, platform; 25 Jan. 2005; L. Albenga and L. Dugrais leg.; ECOSUR 317 • 8 ♂♂ (5 complete and 3 incomplete specs); Clipperton Island, stn 27; 10 ° 18.01 ′ N, 109 ° 13.87 ′ W; depth 1 m, platform; 23 Jan. 2005; S. Hourdez and K. - L. Kaiser leg.; in front of Camp Bougainville; ECOSUR 318. Description (holotype) BODY. Mature female, complete, subcylindrical; 43 mm long, 2 mm wide (without parapodia), 111 chaetigers. Dorsum yellowish, with two light brown lateral lines along body, and a pale middorsal line along 51 chaetigers, thereafter brownish to body end. Venter homogeneously yellowish. PROSTOMIUM. Slightly longer than wide; two pairs of eyes in trapezoidal arrangement, gap between both pairs 1.3 × as wide as diameter of posterior pair. Anterior pair in lateral position, oval, with eye diameter as wide as antennae basal diameter, with gap between eyes 6 × as wide as eye diameter; lenses visible, reddish, rounded, placed anterolaterally covering about 80 % of eye. Posterior pairs rounded, blackish, minute, about 1 / 20 as wide as prostomial width, with diameter 3 × as wide as that of antennae basis, not covered by tentacular belt; with gap between eyes 9 × as wide as eye diameter. Palpophores longer than wide, palpostyle rounded. Median notch extended to middle of prostomium, to level of anterior pairs of eyes. TENTACULAR BELT. 1.4 × as long as first chaetiger; anterior margin not covering posterior eyes. Tentacular cirri corrugate to articulate, tips of two right lateral cirri broken, posterior dorsal cirri reaching chaetiger 6 (Fig. 1 A). ANTENNAE. Conical, tapering, wider basally, tips not reaching palpophore ends, 3.3 × as long as wide at basal region; antennae separated by space as wide as half basal diameter of antennae. PHARYNX. Not exposed, ventrodistal incision needed. Jaws amber with 5 accessory denticles. Paragnaths light brown in color, consisting of uniform-base cones, except shield-shaped bars on Area VI, those of maxillary ring smallest. Formula as follow: maxillary ring: paragnaths conical. AI = 2 in a line; AII = 4 left, 6 right; AIII = 7 paragnaths in central group, and a pair of paragnaths in a line at each side; AIV = 8 left, 10 right. Oral ring: paragnaths conical and smooth bars. AVI-V-VI pattern, υ-shaped (after Villalobos-Guerrero, 2019); AV = 3 conical paragnaths in inverted triangle; AVI = one long shield-shaped bar to each side; VII – VIII = 24 paragnaths with wide basis in three regular bands, anterior band consisting of seven paragnaths only in ridge position, middle band with 11 cones in furrow and ridge, posterior band with six on each ridge position. CHAETIGERS 1 – 2. With neuraciculae only; with both noto- and neuraciculae thereafter. NOTOPODIA. Consisting of dorsal cirrus (comprising proximal cirrophore and distal cirrostyle), dorsal ligule, and median ligule in biramous parapodia. ANTERIOR PARAPODIA (FIG. 1 C). Dorsal cirrophore with two light brown glandular areas, proximal one smaller. Dorsal cirrostyle longer than dorsal ligule, 1.5 × as long as ventral cirri. Dorsal ligule triangular, with blunt tip, 1.4 × as long as wide. Median ligule subconical, blunt, 1.4 × as long as wide, similar size to dorsal ligule. Neuroacicular ligule with superior lobe shorter than inferior lobe, both blunt. Neuropodial prechaetal lobe missing, postchaetal one present. Ventral ligule subconical, 3 × as long as wide, slightly longer than ventral cirri. Notochaetae 5 homogomph spinigers. Supracicular neurochaetae 5 homogomph spinigers, and 3 heterogomph falcigers with blunt tips and spinulose inner edge, blade 6 × as long as wide (Fig. 1 F). Infracicular neurochaetae 1 heterogomph spiniger and 11 heterogomph falcigers, similar than supracicular ones, decreasing slightly in size towards ventral part. MEDIAN PARAPODIA (FIG. 1 D). Dorsal cirrophore with four glandular patch, proximal one smaller, rounded, distal one larger. Dorsal cirrostyle 1.7 × as long as dorsal ligule. Dorsal ligule triangular, tapered, 1.6 × as long as wide, with elongated glandular area. Median ligule subconical, blunt, 2 × as long as wide, slightly longer than dorsal ligule. Neuroacicular ligule rounded anteriorly, with superior lobe slightly visible. Neuropodial prechaetal lobe missing, postchaetal one present. Ventral ligule subulated, 2.5 × as long as wide, slightly longer than ventral cirri. Notochaetae 7 homogomph spinigers. Supracicular neurochaetae 5 homogomph spinigers and 1 heterogomph falcigers, blade 5 × as long as wide; infracicular neurochaetae 1 homogomph spiniger and 7 heterogomph falcigers, blade 5.2 × as long as wide (Fig. 1 G). POSTERIOR PARAPODIA (FIG. 1 E). Dorsal cirrophore with two dark fused glandular areas. Dorsal cirrostyle 1.5 × as long as dorsal ligule, inserted medially. Dorsal ligule triangular, tapered, 1.8 × as long as wide, enlarged glandular masses covering base of ligule. Median ligule subconical, blunt, 2.5 × as long as wide, larger than dorsal one. Neuroacicular ligule triangular, longer than wide. Neuropodial prechaetal lobe missing, postchaetal one present. Superior and inferior lobes not seen; ventral ligule subtriangular, tapered, 2.9 × as long as wide. Ventral cirri similar in size to ventral ligule. Notochaetae 4 homogomph spinigers. Supracicular neurochaetae 6 homogomph spinigers and 2 heterogomph falcigers one of them broken, blade 5.6 × as long as wide (Fig. 1 H). Infracicular neurochaetae 1 heterogomph spiniger, and 4 heterogomph falcigers, blades 6 × as long as wide (Fig. 1 I). POSTERIOR REGION. Pygidium with terminal anus and pair of long anal cirri, as long as last 4 – 5 chaetigers (Fig. 1 B). OOCYTES. Brownish, only present in posterior parapodia, each about 90 µm in diameter, distorted inside right margin of Fig. 1 E.	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFD14603FDC16FA84147F9AC.taxon	description	Variation Complete paratypes are 35 – 60 mm long, 1.2 – 2.2 mm wide, with 100 – 114 chaetigers. A specimen with one paragnath on Area I, another specimen with 3 paragnaths in a line, all other specimens with 2 paragnaths in a line; Area II with 6 paragnaths in two lines in all specimens in each side; Area III with a central group of 8 to 12 small paragnaths and one or two paragnaths on each side. Area IV with 10 – 11 paragnaths at right side and 10 – 12 at left side; Area V invariably with three large paragnaths in inverted triangle; Area VI with one large bar on each side, except in two specimens in one of them, the left bar was fragmented into two pieces. Longer tentacular pair of cirri reaching chaetigers 7 – 11.	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFD14603FDC16FA84147F9AC.taxon	distribution	Distribution This species is known only from Clipperton Island.	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFD14603FDC16FA84147F9AC.taxon	discussion	Remarks The original proposal of the species group of Perinereis by Hutchings et al. (1991) was modified by Prajapat et al. (2024), by transferring 10 species from group 1 B to group 1 A without giving arguments; the species transferred were P. barbara (Monro, 1926) from Port Jackson, Australia; P. capensis (Kinberg, 1865) from Good Hope Cape, South Africa; P. iranica Bonyadi-Naeini, Rastegar-Pouyani, Glasby & Rahimian, 2018 from Iran, Persian Gulf; P. kaustiana Teixeira, Fourreau, Sempere-Valverde & Carvalho, 2024 from Saudi Arabia, Gulf of Aqaba; P. nigropunctata (Horst, 1924) from Malaysia; P. obfuscata (Grube, 1878) from Philippines; P. perspicillata (Grube, 1878) from Philippines; P. pictilis Glasby, Nu- Wei & Gibb, 2013 from Queensland, Australia; P. striolata (Grube, 1878) from Philippines; P. suluana (Horst, 1924) from Pulu Tongkil, Sulu Archipielago and P. villabosi Rioja, 1947 from Western Mexico. Except for P. iranica, P. obfuscata, P. perspicillata, P. pictilis, and P. striolata, we prefer to leave the rest of the species in subgroup 1 B due to the notable development of the posterior parapodia explained in the descriptions or redescriptions of these species. Perinereis hourdezi sp. nov. belongs to the informal species group proposed by Hutchings et al. (1991) characterized by having a transverse bar in Area VI, and dorsal cirrophore not greatly expanded (Group 1 A); currently there are 27 species considered in this group. The group includes P. arabica Mohammad, 1971 described from Kuwait; P. atlantica (McIntosh, 1885) from Cape Verde Islands; P. calmani Monro, 1926 from Eastern Australia and China Sea; P. cultrifera Grube, 1840 from Naples, Mediterranean Sea; P. falsovariegata Monro, 1933 b from Still Bay, South Africa; P. faulwetterae Teixeira, Langeneck, Grosse, Bakken & Ravara, 2025 from the Mediterranean Sea; P. floridana Ehlers, 1868 from Florida, North America; P. helleri Grube, 1878 from the Philippines; P. houbihuensis Hsueh, 2024 from Taiwan; P. iranica Bonyadi-Naeini et al., 2018 from Abu Musa Island, Persian Gulf; P. louizomarum Rezzag Mahcene, Villalobos-Guerrero, Kurt, Denis & Dass, 2023 from Algeria; P. longdongwanensis Hsueh, 2024 from Taiwan; P. minerva Teixeira, Langeneck, Grosse, Bakken & Ravara, 2025 from the Mediterranean Sea; P. misrai Prajapat, Villalobos & Vachhrajani, 2024, from India; P. muscoi Teixeira, Langeneck, Grosse, Bakken & Ravara, 2025 from the Mediterranean Sea; P. obfuscata (Grube, 1878) from the Philippines; P. pangcahae Hsueh, 2024 from Taiwan; P. perspicillata (Grube, 1878) from the Philippines; P. rullieri Pilato, 1974 from Sicily, Catania, Mediterranean Sea; P. pseudocultrifera Hsueh, 2024 from Taiwan; P. seurati Gravier 1905 from Gambier Islands in freshwater; P. striolata (Grube, 1878) from the Philippines; P. taitungensis Hsueh, 2024 from Taiwan; P. taorica Langerhans, 1881 from the Canary Islands; P. tenuisetis Fauvel, 1915 from the Mediterranean Sea; P. twobae Teixeira, Langeneck, Grosse, Bakken & Ravara, 2025 from the Mediterranean Sea; and P. websteri Conde-Vela 2022 from Bermuda. Perinereis hourdezi sp. nov. resembles P. cultrifera, P. helleri, P. misrai, P. rullieri, P. taitungensis, P. rullieri, P. taorica and P. websteri by having Area III with 2 – 3 paragnaths in line on both side of the central area, as well as 3 paragnaths in a triangular arrangement over Area V. However, P. hourdezi as well as P. misrai, P. rullieri and P. websteri do not present notopodial prechaetal lobe; P. hourdezi can be separated from these species because it has a short neuropodial postchaetal lobe on all parapodia. Solís-Weiss & Hernández-Alcántara (2009: 251, 255) recorded Perinereis sp. for Clipperton Island, after 7 anterior fragments of juvenile specimens collected in their station 2, in the west side of the island. Their specimens could belong to this newly described species, but because it was not illustrated and the specimens were not available, we cannot clarify their status. Key to the species of group 1 A of Perinereis Kinberg, 1865 (after Hutchings et al. 1991, modified by Prajapat et al. 2024)	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFD14603FDC16FA84147F9AC.taxon	description	3. Neuropodial postchaetal lobe present throughout body ................................................................... 4 – Neuropodial prechaetal lobe absent .................................................................................................. 6 4. Acicula light yellow; Area V without paragnaths; neurochaetae with homogomph falcigers ........... ...................................................................................................... P. tenuisetis (Fauvel, 1915) (Italy) – Aciculae dark brown or black; Area V with paragnaths; neurochaetae with heterogomph falcigers .......................................................................................................................................................... 5 5. Areas VII – VIII with four irregular bands of paragnaths; Area III without laterally isolated paragnaths; Area I with 0 – 2 paragnaths; subacicular neurochaetae with homogomph spinigers .......................... ............................................................................................... P. arabica Mohammad, 1971 (Kuwait) – Areas VII – VIII with a line of 3 – 6 paragnaths; Area III without laterally isolated paragnaths; Area I with 16 paragnaths in group; subacicular neurochaetae with heterogomph spinigers ....................... ............................................................................................... P. taorica Langerhans, 1881 (Madeira) 6. Area III with laterally isolated paragnaths ........................................................................................ 7 – Area III without laterally isolated paragnaths ................................................................................ 13 7. Area V with paragnaths ................................................................................................................... 8 – Area V without paragnaths .............................................. P. pseudocultrifera Hsueh, 2024 (Taiwan) 8. Area V with only one paragnaths ...................................................................................................... 9 – Area V with 2 or more paragnaths ................................................................................................... 11 9. Area I with one paragnath; Area III with 6 – 7 paragnaths; Area VI with a shield-shaped bar ............ ............................................. P. minerva Teixeira, Langeneck, Grosse, Bakken & Rava, 2025 (Italy) – Area I with numerous paragnaths; Area III with more than 10 paragnaths; Area VI with a crescent-shaped bar ....................................................................................................................................... 10 10. Posterodorsal tentacular cirri reaching chaetiger 8.2 × as long as palps; Area I with 4 or more paragnaths ............................................................................. P. striolata (Grube, 1878) (Philippines) – Posterodorsal tentacular cirri reaching chaetiger 5, about as long as palps; Area I with 1 paragnath ............................................................................................ P. obfuscata (Grube, 1878) (Philippines) 11. Dorsal cirrus subequal or slightly shorter than dorsal ligule in middle parapodia ......................... 12 – Dorsal cirrus slightly longer than dorsal ligule in middle parapodia; notopodial prechaetal lobe present throughout body; posterodorsal tentacular cirri reaching chaetiger 5 – 8; Area I with one paragnath; Area V with 3 paragnaths in triangle; ridge of areas VI – V – VI with U-shaped pattern .... .................................................................................................... P. rullieri Pilato, 1974 (Sicily, Italy) 12. Posterodorsal tentacular cirri reaching chaetiger 4 – 5; jaws with 4 – 5 teeth; Area VI with conical shield-shaped bar; ridge of areas VI – V – VI with π- shaped pattern .................................................... ....................................................................................................... P. cultrifera (Grube, 1840) (Italy) – Posterodorsal tentacular cirri reaching chaetiger 2; jaws with 3 teeth; Area VI with rectangular-shaped type bar; ridge of areas VI – V – VI with ɔc- shaped pattern ...... P. taitungensis Hsueh, 2024 (Taiwan) 13. Postero-dorsal tentacular cirri reaching chaetiger 2 – 3 ................................................................... 14 – Postero-dorsal tentacular cirri reaching chaetiger 4 ....................................................................... 16 14. Area I with 2 paragnaths in a line; Area V with 0 – 1 paragnaths; jaws with up to 5 teeth .............. 15 – Area I with 5 paragnaths in group; Area V with 4 (4 – 16) paragnaths; jaws with up to 3 teeth ......... ...................................................................................... P. longdongwanensis Hsueh, 2024 (Taiwan) 15. Area V with 1 paragnath; Area VI with a smooth-shaped bar; with neuropodial postchaetal lobe ....................................................................................... P. houbihuensis Hsueh, 2024 (Taiwan) – Area V without paragnaths; Area VI with crescent-shaped bar; without neuropodial postchaetal lobe ................................................... P. calmani (Monro, 1926) (Australia and MacClesfield Bank) 16. Posterodorsal tentacular cirri reaching chaetiger 5 – 6; jaws with up to 6 teeth; Area III with no more than 7 paragnaths ............................................................................................................................ 17 – Posterodorsal tentacular cirri reaching chaetiger 11; jaws with 11 teeth; Area III with 10 – 15 paragnaths ................................................ P. seurati Gravier, 1905 (Gambier Islands, in freshwater) 17. Jaws with 0 – 3 teeth; Area V without paragnaths, rarely with 1 – 2; Area VI with crescent-shaped bar ........... P. louisomarum Rezzag Mahcene, Villalobos-Guerrero Kurt, Denis & Dass, 2023 (Algeria) – Jaws with 5 – 6 teeth; Area V with 3 paragnaths in triangle; Area VI with chevron-shaped bar; ridge of areas VI – V – VI with U-shaped pattern ........................................................................................... .............. P. muscoi Teixeira, Langeneck, Grosse, Bakken & Rava, 2025 (Italy, Salento, Ionian Sea) 18. Area V with 1 paragnath ................................................................................................................. 19 – Area V with 3 or more paragnaths .................................................................................................. 21 19. Area I with 1 paragnath; Area III without laterally isolated paragnaths ............................................. ................................................................... P. atlantica (M’Intosh, 1885) (São Vicente, Cape Verde) – Area I with 2 or more paragnaths; Area III with laterally isolated paragnaths ............................... 20 20. Area I with 2 paragnaths; ridge of areas VI – V – VI with λ-shaped pattern; Area VI with smooth shaped bar ................................................................................... P. floridana Ehlers, (1868) (Florida, USA) – Area I with 4 (rarely 2 – 5) paragnaths; Area VI – V – VI with ɔc- shaped ridge pattern; Area VI with bar type chevron-shaped ................................................................. P. pangcahae Hsueh, 2024 (Taiwan) 21. Postero-dorsal tentacular cirri reaching chaetiger 2; mandibles with 11 – 12 teeth; Area VI with smooth shaped bar ................................................................................................ P. iranica Bonyadi-Nacini, Rastegar-Pouyani, Rastegar-Pouyani, Glasby & Rahimian, 2018 (Abu Musan Island, Persian Gulf) – Postero-dorsal tentacular cirri reaching chaetiger 6; mandibles with 7 teeth; Area VI with shield-shaped bar ...................................................................... P. perspicillata (Grube, 1878) (Philippines) 22. Notopodial prechaetal lobe present ................................................................................................ 23 – Notopodial prechaetal lobe absent .................................................................................................. 25 23. Area III with group of 11 – 20 paragnaths and two lateral groups with 2 – 3 paragnaths in line; Area VI with one smooth straight bar in each side ................................ P. helleri (Grube, 1878) (Philippines) – Area III with up to 7 paragnaths, without lateral groups; Area VI with shield-shaped bar on each side .................................................................................................................................................. 24 24. Dorsum with transverse rows of unpigmented papillae; antennae ½ × as long as palpophores; ridge areas VI – V – VI with ɔc- shaped pattern ............................................................................................... P. faulwetterae Teixeira, Langeneck, Grosse, Bakken & Rava, 2025 (Italy, Trieste, Adriatic Sea) – Dorsum without transverse rows of papillae; antennae as long as palpophores; antennae reach anterior end of palpophore; ridge areas VI – V – VI with U-shaped pattern ....................................................... .............................. P. twobae Teixeira, Langeneck, Grosse, Bakken & Rava, 2025 (Italy, Calafuria) 25. Ridge of areas VI – V – VI with π- shaped pattern ............................................................................. 26 – Ridge of areas VI – V – VI in another pattern .................................................................................... 27 26. Area III with group of 10 – 11 paragnaths and sometimes with 1 – 2 isolated lateral paragnaths; Area V with 3 paragnaths in triangle; Area VI with crescent-shaped bar in each side; area VII – VIII with 21 – 26 paragnaths inserted in forrow zone .......................................................................................... ................................................. P. misrai Prajapat, Villalobos-Guerrero & Vachhrajani, 2024 (India) – Area III with 20 – 24 paragnaths in oval group; Area V with one paragnath, without lateral groups; Area V with only one paragnath; Area VI with broad petite shield-shaped bar in each side; Area VII – VIII with 30 paragnaths inserted in forrow and ridge zones ....................................................... .................................................................................... P. falsovariegata Monro, 1933 (South Africa) 27. Neuropodial postchaetal lobe present; jaws with up to 5 teeth; Area I with 2 paragnaths in line; Area IV with up to 8 – 10 paragnaths; Area V with 3 paragnaths in triangle; Area VI with shield-shaped bar in each side; Area VII – VIII with 24 paragnaths in 3 regular bands; ridge of areas VI – V – VI with U-shaped pattern .................................................................. P. hourdezi sp. nov. (Clipperton Island) – Neuropodial postchaetal lobe absent; jaws with up to 10 teeth; Area I with 3 paragnaths in triangle; Area IV with up to 18 – 19 paragnaths; Area V with 1 paragnath; Area VI with smooth shaped bar in each side; Area VII – VIII with 16 paragnaths in 2 regular bands; ridge of areas VI – V – VI with λ- shaped pattern ................................................................. P. websteri Conde-Vela, 2022 (Bermuda)	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFDB4600FDFF691B4718FCEA.taxon	type_taxon	Type species	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFDB4600FDFF691B4718FCEA.taxon	discussion	Remarks Synelmis includes pilargids with a thin, muscular body, with a thick cuticle, and many segments. Their shiny integument and consistency resemble those found in nematodes, but the presence of parapodia easily separates them from each other. As indicated in the key below, the species can be sorted out after some morphological features, especially regarding the insertion of lateral antenna, the size of median antenna, the presence and number of eyes, the start of notospines, and the shape and size of parapodial cirri. The presence of pigmented glands along the body can be useful to separate similar species.	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFDB4600FDFF691B4718FCEA.taxon	distribution	Distribution The species of Synelmis thrive in shallow to continental shelf substrates, in mixed or sandy bottoms, in tropical to temperate localities throughout the world.	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFD84607FDCA6D344146F846.taxon	description	Fig. 2	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFD84607FDCA6D344146F846.taxon	diagnosis	Diagnosis Synelmis with lateral antennae inserted basally to palps; notospines from chaetiger 5; median chaetigers with dorsal cirri basally swollen, tapered, ventral cirri twice as long as wide.	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFD84607FDCA6D344146F846.taxon	etymology	Etymology The species is named after Dr Tarik Meziane, curator of the Annelida collection of the Muséum national d’Histoire naturelle, Paris, in recognition of his long-term support of our research activities. The specific epithet is a noun in the genitive case (ICZN 1999, Art. 31.1.2).	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFD84607FDCA6D344146F846.taxon	materials_examined	Type material Holotype FRANCE • complete spec.; Clipperton Island, stn 10; 10 ° 17.31 ′ N, 109 ° 12.19 ′ W; depth 13 m; 17 Jan. 2005; J. - M. Bouchard, L. Albenga and L. Dugrais leg.; coral rubble, suction pump; MNHN IA- 2000 - 2108. Paratype FRANCE • 1 complete spec.; same data as for holotype, colorless anterior fragment, 10 mm long, 0.5 mm wide, 42 chaetigers; ECOSUR 319. Other material examined FRANCE • 2 median fragm.; same data as for holotype, fragments 9.5 – 12.5 mm long, 0.5 – 0.6 mm wide, 31 – 45 chaetigers, pale, almost breaking off in some portions; MNHN IA- 2001 - 157.	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFD84607FDCA6D344146F846.taxon	description	Description BODY. Holotype (MNHN IA- 2000 - 2108), anterior fragment, colorless, subcylindrical, tapered anteriorly; in cross section, dorsum elevated, parapodia on lateral depressions, venter with longitudinal groove; 19 mm long, 0.5 mm wide, 74 chaetigers. PROSTOMIUM. Trapezoidal, slightly wider posteriorly (Fig. 2 A). Palps biarticulate, separated from each other, separation visible dorsally and ventrally, palpostyles hemispherical, ventral papillae tapered, surpassing palpostyles tips. Antennae all cirriform, lateral antennae inserted anteriorly, close to palp bases, surpassing palpostyle tips; median antenna inserted on posterior prostomial margin, ½ × as long as prostomial length. Eyes blackish, semilunar, positioned slightly ahead of lateral antenna. TENTACULAR BELT. Tentacular cirri cirriform, directed anteriorly, ventral cirri slightly longer than dorsal ones. PARAPODIA. Sesquiramous throughout fragment. First dorsal cirri longer than following ones. Parapodial cirri thinner, not basally swollen along chaetigers 1 – 9. Dorsal and ventral cirri basally swollen, with long tapered tips, glandular in median (Fig. 2 B – C), and posterior segments (Fig. 2 D – E). Neurochaetal lobe truncate, sometimes not visible by obstruction of body wall. Notopodia of chaetigers 1 – 4 without notospines, following one with notospines, progressively longer and more exposed posteriorly, tips usually broken. CHAETAE. Furcate chaetae not seen, probably broken. Neurochaetae simple, smooth or finely spinulose capillaries, about 14 per bundle by chaetiger 40, with 1 – 2 larger than others, decreasing to about 10 per bundle by chaetiger 70. POSTERIOR END. Unknown. Variation The paratype (ECOSUR 319) shows a similar morphology. The lateral antennae surpass palpostyles tips; ventral palp papillae tapered, surpassing palpostyles tips; eyes are semilunar; median antenna half as long as prostomium; tentacular cirri wider basally, tapered, ventral ones slightly longer than dorsal ones; parapodial cirri similar, progressively wider basally from chaetiger 8 – 9; notospines from chaetiger 5; furcates not seen, probably broken.	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFD84607FDCA6D344146F846.taxon	distribution	Distribution Only known from subtidal rocky bottoms in Clipperton Island, Eastern Pacific.	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFD84607FDCA6D344146F846.taxon	discussion	Remarks Synelmis mezianei sp. nov. resembles S. kirkegaardi Salazar-Vallejo, 2003 from Cape Verde Islands, Eastern Atlantic, because both species have lateral antennae inserted anteriorly, notospines from chaetiger 5, and parapodial cirri basally swollen. However, they differ because in S. mezianei median segments have parapodial cirri tapered and ventral cirri are 2 × as long as wide, whereas in S. kirkegaardi parapodial cirri are fusiform mucronate, about as long as wide.	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFD84607FDCA6D344146F846.taxon	description	4. Prostomium with two eyes ................................................................................................................ 5 – Prostomium with two rows of lateral eyes, each with 4 – 5 ocelli; chaetiger 1 with dorsal cirrus as long as following ones .................................................................... S. knoxi Glasby, 2003 (New Zealand) 5. Anterior segments without pigmented lateral glands; median antenna short, about ½ × as long as prostomial length; chaetiger 1 with dorsal cirri longer than following ones ...................................... ...................................................................................... S. amoureuxi Salazar-Vallejo, 2003 (Brazil) – Anterior segments with abundant, dark lateral glands; median antenna long, ¾ × as long as prostomial; chaetiger 1 with dorsal cirri longer than following ones ................................................. ............................................................ S. gibbsi Salazar-Vallejo, 2003 (Red Sea to Marshall Islands) 6. Median segments with parapodial cirri fusiform mucronate, ventral cirri as long as wide ................ ..................................................................... S. kirkegaardi Salazar-Vallejo, 2003 (Eastern Atlantic) – Median segments with parapodial cirri tapered, ventral cirri 2 × as long as wide ............................. .............................................................................................. S. mezianei sp. nov. (Clipperton Island) 7. Prostomium with eyes ....................................................................................................................... 8 – Prostomium without eyes ............................................................................................................... 15 8. Only one pair of lateral eyes ............................................................................................................. 9 – Eyes multiple, 2 – 4 in each lateral row (sometimes laterally fused) ............................................... 13 9. Median segments with parapodial cirri fusiform; median antenna short, not reaching chaetiger 1 ... ......................................................................................................................................................... 10 – Median segments with parapodial cirri digitate to basally swollen, not fusiform .......................... 12 10. All antennae fusiform ...................................................................................................................... 11 – All antennae cirriform; notospines from chaetigers 10 – 11; without lateral glands behind chaetal lobes ......................................................................... S. albini (Langerhans, 1881) (Eastern Atlantic) 11. Notospines from chaetiger 8; dorsal cirri as long as wide .................................................................. ............................................................................................ S. cf albini Wolf, 1984 (Gulf of Mexico) – Notospines from chaetigers 10 – 16; dorsal cirri 2 × as long as wide .................................................. ............................................. S. harrisae Salazar-Vallejo, 2003 (California to northwestern Mexico) 12. Median antenna short, not reaching chaetiger 1; eyes dorsal; notospines from chaetiger 13 – 18 ....... ................................................................. S. britayevi Salazar-Vallejo, 2003 (Mozambique Channel) – Median antennae long, reaching chaetiger 1; eyes lateral; notospines from chaetigers 7 – 14; eyes lateral or absent ...................................... S. emiliae Salazar-Vallejo, 2003 (partim) (Eastern Pacific) 13. With two eyes per side, fused to each other .................................................................................... 14 – With four eyes per side; median and posterior chaetigers with dorsal and ventral cirri basally swollen to digitate; notospines from chaetigers 17 – 22 .................................................................................... ............................................................................... S. sotoi Salazar-Vallejo, 2003 (Grand Caribbean) 14. Median and posterior chaetigers with dorsal and ventral cirri digitate, similar in length and width; notospines from chaetigers 15 – 23 ...................... S. rigida (Fauvel, 1919) (India to Western Pacific) – Median chaetigers with dorsal and ventral cirri fusiform; notospines from chaetigers 9 – 11 ............. .................................................................................. S. gorgonensis (Monro, 1933 a) Eastern Pacific 15. Notospines from chaetiger 5; median segments with parapodial cirri of similar length; median antenna short, not reaching chaetiger 1 .............................................................................................. ............................................................. S. levinae Salazar-Vallejo, 2003 (Eastern Pacific seamounts) – Notospines from chaetigers 8 – 20; median segments with ventral cirri longer than dorsal ones .... 16 16. Median antenna long, reaching chaetiger 1 .................................................................................... 17 – Median antenna short, not reaching chaetiger 1 ............................................................................. 18 17. Median segments with ventral cirri 2 × as long as wide; notospines from chaetigers 13 – 15 ............ ................................................................ S. emiliae Salazar-Vallejo, 2003 (partim) (Eastern Pacific) – Median segments with ventral cirri 4 × as long as wide; notospines from chaetigers 9 – 20 .............. ......................................................................................... S. sergi Glasby & Marks, 2013 (Australia) 18. Median segments with parapodial cirri tapered .............................................................................. 19 – Median segments with parapodial cirri swollen medially, mucronate; notospines from chaetiger 12 ................................................................... S. glasbyi Salazar-Vallejo, 2003 (Mozambique Channel) 19. Notospines from chaetiger 8 – 10; all antennae of similar size ............................................................ .............................................................................. S. urogorri Moreira & Parapar, 2007 (NW Spain) – Notospines from chaetigers 12 – 15; median antenna slightly longer than laterals ............................. .................................................................................. S. sinica Sun & Chen, 1990 (South China Sea)	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFDC4605FDED6FE5462DFD96.taxon	type_taxon	Type species Lygdamis indicus Kinberg, 1867, by monotypy. Diagnosis (modified from Capa et al. 2012) Sabellariids with opercular lobes completely separated; outer and inner paleae arranged in semicircles. Nuchal hooks falcate, without limbation. Median organ cylindrical truncate or tapered blunt. Tentacles in parallel series (compound). Four parathoracic segments, each with lanceolate paleae and capillaries in each parapodial branch. Branchiae from segment 2 to mid-abdominal segments.	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFDC4605FDED6FE5462DFD96.taxon	discussion	Remarks Caullery (1913) noted there were two groups of species, separated by the number of parathoracic chaetigers, in what he regarded as Pallasia de Quatrefages, 1848, and he also indicated that de Quatrefages had not clarified the number of parathoracic chaetigers. He restricted Pallasia to include species with three parathoracic chaetigers, whereas for those provided with four, he proposed Tetreres. Pallasia had been used before in dipterans (Robineau-Desvoidy 1830), and in fishes (Nardo 1840), rendering invalid its usage for polychaetes. Annenkova (1925) proposed Pallasina as a new name for Pallasia. Johansson (1926: 6; 1927: 81) concluded that Tetreres was a junior synonym of Lygdamis, and he might not have seen the paper by Annenkova, but it would make no difference for nomenclatural purposes. Tetreres Caullery, 1913 was listed above in the list of synonyms, but in part, because three species Caullery listed actually belong in Lygdamis, as indicated by Kirtley (1994: 3). After de Quatrefages (1848), Johansson (1927) made the most extended study on sabellariids including histological details. Johansson included keys to genera, but the most complete revision was by Kirtley (1994), because he modified the generic composition of the family, proposed some genera, and described many species. In Lygdamis, Kirtley described 7 species and included a key to the then known 16 species. Lechapt & Kirtley (1998) slightly modified the previous key, but because of some problems running it, a new key is presented below to the known species. On the other hand, a nomenclatural note must be included regarding Tetreres. Caullery (1913) listed five species in the genus and newly combined as T. laevispinis (Grube, 1870), T. giardi (M’Intosh, 1885), T. murata (Allen, 1904), T. asteriformis (Augener, 1906), and T. porrecta (Ehlers, 1908). The first three belong in Lygdamis, as indicated by Kirtley (1994; see key below), whereas the latter two belong elsewhere. Kirtley (1994: 188) retained Tetreres for species like the last two ones, and for seven species newly described by him. His proposal and separation were confirmed in recent studies (Capa et al. 2012; Hutchings et al. 2012). However, Kirtley (1994: 188) proposed Hermella varians Treadwell, 1902 as its type species, but this is incorrect. Because Caullery did not indicate the type species for Tetreres, a subsequent designation is in order. However, the species to be designated must be one of those included in the original proposal (ICZN 1999, Arts 67.2, 69.1). Caullery (1913: 200) newly combined H. varians in Pallasia, not in Tetreres, and this listing might made Kirtley think his proposal was code compliant, but it is not. Consequently, the type species by subsequent designation must be Sabellaria (Pallasia) asteriformis Augener, 1906, which is a junior synonym of Hermella varians Treadwell, 1902, as confirmed by Kirtley (1994: 197) after the study of their type specimens.	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFDD461CFD326CC945EBFE41.taxon	description	Figs 3 – 4, Table 1	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFDD461CFD326CC945EBFE41.taxon	diagnosis	Diagnosis Lygdamis with outer paleae smooth, of a single type, straight, solid, not annulate, aristate, tips bent 140 – 150 °, 34 per side; inner paleae 14 per side; median organ tapered, blunt; nuchal hooks tapered, tips long, wide, sharp.	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFDD461CFD326CC945EBFE41.taxon	etymology	Etymology The species is named after Dr María Capa, in recognition of her many publications on taxonomy of marine annelids, and especially after her studies on sabellariid polychaetes which were very useful during this contribution. The specific epithet is a noun in the genitive case (ICZN 1999, Art. 31.1.2).	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFDD461CFD326CC945EBFE41.taxon	materials_examined	Type material Holotype FRANCE • complete spec.; Clipperton Island, stn 36; 10 ° 17.49 ′ N, 109 ° 13.56 ′ W; depth 54 m; 27 Jan. 2005; S. Hourdez, K. - L. Kaiser and J. - M. Bompar leg.; anchoring of Rara Avis; MNHN IA- 2000 - 2109. Paratypes FRANCE • 1 complete spec.; same data as for holotype; paratype breaking in two; MNHN IA- 2000 - 2110 • 5 complete specs; Clipperton Island, stn 10; 10 ° 17.31 ′ N, 109 ° 12.19 ′ W; depth 13 m; 17 Jan. 2005; J. - M. Bouchard, L. Albenga and L. Dugrais leg.; coral rubble, suction pump, one still in tube, another one too twisted, colorless; ECOSUR 320 • 2 complete specs; Clipperton Island, stn 17; 10 ° 19.22 ′ N, 109 ° 13.39 ′ W; depth 23 m; 20 Jan. 2005; J. - M. Bouchard, L. Albenga and L. Dugrais leg.; epifaunal organisms, hand collecting, opercula barely pigmented; MNHN IA- 2000 - 2111 • 1 complete spec.; Clipperton Island, stn 20; 10 ° 17.50 ′ N, 109 ° 13.55 ′ W; depth 20 m; 22 Jan. 2005; J. - M. Bouchard, L. Albenga and L. Dugrais leg.; anchoring point of Rara Avis, coral rubble, colorless, with tube fragments, first branchiae duplicate; MNHN IA- 2000 - 2112 • 5 complete specs; Clipperton Island, stn 25; 10 ° 19.34 ′ N, 109 ° 13.40 ′ W; depth 18 m; 23 Jan. 2005; S. Hourdez and K. - L. Kaiser leg.; coral rubble, platform margin, one in tube, colorless, anal peduncle contracted, blackish, smallest specimen medially brownish; ECOSUR 321 • 2 complete specs; Clipperton Island, stn 27; 10 ° 18.01 ′ N, 109 ° 13.87 ′ W; depth 1 m; 23 Jan. 2005; S. Hourdez and K. - L. Kaiser leg.; in front of Camp Bougainville, colorless; MNHN IA- 2000 - 2113 • 1 complete spec.; Clipperton Island, stn 30; 10 ° 18.72 ′ N, 109 ° 12.01 ′ W; depth 15 m; 24 Jan. 2005; S. Hourdez, K. - L. Kaiser and J. - M. Bompar leg.; coral rubble and red algae, colorless, precaudal region with a band of tiny black spots, wider mid-ventrally; ECOSUR 322 • 1 anterior fragm.; Clipperton Island, stn 31, East of Port Jaouen; 10 ° 17.45 ′ N, 109 ° 13.26 ′ W; depth 1 m; 24 Jan. 2005; S. Hourdez and K. - L. Kaiser leg.; colorless; MNHN IA- 2000 - 2114. Description (holotype) BODY. Complete, mature specimen, preserved in tube, posterior region breaking off. Body 52 mm long, 4 mm wide, 54 chaetigers. Body pale; operculum dark brown, especially laterally with pale spots below marginal cirri (Fig. 3 A – C); prepygidial parapodia with interramal glandular ridge, brownish (Fig. 3 E). OPERCULUM. Oblique, bent ventrally, dorsally depressed into darker concavity (Fig. 3 A). Opercular paleae golden; outer paleae aristate, tips bent 140 ° – 150 °, 56 per side, core solid, non-annulate (Fig. 4 A); inner paleae straight to slightly bent, darker, core brownish (Fig. 4 B), 22 per side. Marginal papillae cirriform, basally wider, tapered, blunt, larger posteriorly, decreasing in size anteriorly (Fig. 3 C), papillae with anterior surface darker, lateral paler areas extended into opercular margin (Fig. 3 A), 18 papillae per side. Opercular ventral surface with 11 oblique series of tentacles per side, tentacular series longer basally, shorter distally (Fig. 3 B). PALPS. Tapered, contracted, one visible ventrally (Fig. 3 B), other hidden between tentacles. Mouth U-shaped, lateral lips foliose, partially covering mouth opening. NUCHAL HOOKS. Large, tapered, falcate, sharp, completely covered by pale, hook foliose projection (Fig. 3 D); hooks noted because of their darker pigmentation. In one paratype (Fig. 4 C) sharp, long, wide, with handles annulate. Median organ shorter than palps, tapered, tip blunt, blackish, with series of lateral eyespots, visible close to nuchal hooks. THORAX. With 2 chaetigers without notochaetae. Chaetiger 1 with capillary neurochaetae and long, conical ventral cirrus directed ventrally, reaching mouth opening. Chaetiger 2 with capillary neurochaetae and long, conical ventral cirrus directed anteriorly, shorter than one present in chaetiger 1, and 2 slightly shorter cirri directed dorsally. Branchiae cirriform, tapered, from chaetiger 2, continued through 25 more segments. PARATHORAX. With 4 biramous chaetigers with paleae and capillaries in both rami. Notopodia 4 × as long as neuropodia, dorsal cirri digitate on a swollen, wide conical base (Fig. 4 D); neuropodial cirri conical, blunt, as long as wide (Fig. 4 E). Notochaetae directed posteriorly, 10 – 12 per ramus, increasing in number posteriorly; neurochaetae directed anteriorly, 7 – 9 per ramus, increasing in number posteriorly; tips finely denticulate (Fig. 4 E, inset). ABDOMEN. With parapodia biramous, first two chaetigers with longer notopodia; successive notopodia half as long. Notopodia uncinigerous, foliaceous, short, curved lobes with abundant uncini (Fig. 4 F), each with 8 – 9 transverse rows of denticles, mostly paired (Fig. 4 F, upper inset). Neuropodia reduced to short chaetal lobe; neurochaetae capillaries, thicker ones verticillate denticulate, thinner ones denticulate (Fig. 4 F). Prepygidial abdominal segments with notopodia reduced to short fan-shaped lobes, with glandular pigmented ridge between parapodial rami (Fig. 3 E). CAUDA. Short, tubular, bent ventrally, damaged, without cirri.	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFDD461CFD326CC945EBFE41.taxon	description	Variation The variation of some morphological features in 16 specimens is shown in Table 1. All features are size-dependent. Specimens were 12 – 52 mm long (mean 30.7 mm); smaller specimens were pale, especially if preserved outside their tubes, larger specimens and those preserved in tubes are darker. Their opercula had 15 – 56 outer (mean 34), and 6 – 22 inner (mean 14) paleae, and 8 – 18 marginal papillae (mean 14). The latter are usually blunt, shorter in smaller specimens and progressively smaller towards the dorsalmost position. The second parathoracic chaetiger had 7 – 17 notochaetal (mean 11), and 4 – 8 neurochaetal lanceolate paleae (mean 6). The median organ was never truncate, it was mostly blunt, but in three cases it had a more defined tip. Most specimens had two hooks, golden in smaller, brownish in larger specimens; only two specimens had one of them duplicate. The depressed lobe covering the falcate dorsal hook tip was covering the hooks completely in 4 specimens, medially in 11 specimens, and basally in 2; the latter might be due to partial damages due to abrasion during sampling. There were 19 – 35 pairs of branchiae (mean 25); anterior branchiae longer, progressively smaller posteriorly, often detached. The cauda, or anal peduncle, was always very short, 0.3 – 1.7 mm long. Specimens larger than 25 mm had hypertrophied gonads along posterior body half; smaller ones are juveniles.	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFDD461CFD326CC945EBFE41.taxon	distribution	Distribution Only known from Clipperton Island, on rocky bottoms, 1 – 54 m depth; some Eastern Pacific records of L. nesiotes (Chamberlin, 1919) might represent this species but there are not enough details in earlier records to clarify this.	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFDD461CFD326CC945EBFE41.taxon	discussion	Remarks Lygdamis mariae sp. nov. resembles L. nesiotes (Chamberlin, 1919) described from the Tuamotu Islands (18 ° 47 ′ S, 141 ° 35 ′ W), and they are so similar that some Eastern Pacific records might represent this new species. After the key above, their main differences rely on the inner structure of the outer paleae, the angle formed by their tips, and the number of inner paleae. In L. mariae, outer paleae are solid, non-annulate, their tips bend at about 140 – 150 °, and there are 14 pairs of inner paleae, whereas in L. nesiotes they are annulate internally, their tips are bent at about 120 °, and there are 17 pairs of inner paleae. Chamberlin (1919) included some other details that might be relevant. For example, in his specimens being up to 32 mm long, he noted that opercular paleae, inner and outer, had annulated cores (Chamberlin 1919: 492: “ cross-striate ”), 5 – 7 chaetae in parathoracic parapodia, 17 – 19 pairs of branchiae, and dorsal hooks are completely covered by a fleshy depressed lobe matching hook’s shape (Chamberlin 1919: 491, pl. 75 fig. 7). As indicated above, these features are size-dependent and of limited use for diagnostic purposes. On the other hand, he noted the median organ: “ just in front of the nuchal hooks in the depression between the two opercular lobes is a long unpaired cirrus with a dark tip ” (Chamberlin 1919: 491). Capa et al. (2015: 197, table 1) noted it can be tapered, blunt (as in L. giardi (M’Intosh, 1885) or L. wambiri Hutchings et al. 2012), or cylindrical truncate (in their L. nasutus). The shape could be diagnostic as it seems truncate ones are cylindrical, whereas tapered ones are triangular in cross section; regretfully, there are no details about their shape, and their presence has been indicated for 8 out of 19 species compiled by Hutchings et al. (2012: 25, table 2).	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
03C887AFFFDD461CFD326CC945EBFE41.taxon	discussion	Remarks Hartman (1967: 150) recorded an undescribed species from sediments at depths of 3678 – 3803 m in the Drake Passage, Antarctica. She indicated the operculum had 16 smooth outer paleae, and 3 – 4 inner ones per side, and that the nuchal hooks were “ flat, curved at right angles to the shaft, and distally expanded. ” The species was listed by Achari (1974: 50, table 1) as belonging to Lygdamis, but it was transferred to Tetreres and described as T. maririceae by Kirtley (1994: 194), although he did not cite Hartman’s record. This explains why it was excluded from the key above. On the other hand, the first introduction of the name Tetreres muratus var. gilchristi by McIntosh has been cited with three different years. Kirtley (1994: 127) gives 1922, Hartman (1959: 476) gives 1924, which is the correct one and followed by WoRMS (Read & Fauchald 2021), and Day (1967: 677) gives 1925 which refers to the second publication, with illustrations, of the preceding one made one year before. On the other hand, because morphological features are size-dependent in L. mariae sp. nov., the known size or size range for each species has been included in the key to help identify specimens, because size range might differ between similar species.	en	Salazar-Vallejo, Sergio I., León-González, J. Angel De (2025): Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy 1026: 1-29, DOI: 10.5852/ejt.2025.1026.3103, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3103/13843
