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Family Telothelepodidae Nogueira, Fitzhugh & Hutchings, 2013 Figs 3���4 Diagnosis (after Nogueira et al. 2018; Hutchings et al. 2021a, most important diagnostic characters highlighted in bold) Transverse prostomium attached to dorsal surface of upper lip; basal part as thick crest, eyespots frequently present in one pair of dorso-lateral clusters, each with several rows of eyespots (Fig. 3A); distal part at base of upper lip, frequently with low or erect mid-dorsal tongue-like process, fused to upper lip at variable degrees, with free distal lobe(s), or free from the base. Buccal tentacles of two types, short ones thin, uniformly cylindrical, long tentacles stouter and expanded at tips, slightly spatulate (Figs 3A���B, F, 4A). Peristomium forming lips and continuing dorsally at least for short extension, with dorso-lateral nuchal organs at margin with prostomium; lips expanded, upper lip distinctly elongate and narrow, undulated to convoluted; swollen lower lip extending across ventrum, cushion-like or segment-like, frequently deeply grooved (Figs 3A���B, 4A). Either SG I or SG II reduced, not forming complete ring in many species. Anterior segments glandular ventrally, smooth, discrete shields absent and frequently with glandular regions poorly developed in comparison to other families of Terebellidae s.l.; mid-ventral groove frequently extending from anterior segments. Two pairs of cirriform branchiae on SG II���III, each pair with simple thin, curled and relatively short filaments progressively tapering to tips (Figs 3A, 4A), originating from raised crests on anterior margins of SG II and III, or from specialised, apparently glandular, dorso-lateral cushion-like pads occupying from anterior margins to level of posterior bases of notopodia of those segments. Notopodia beginning from SG II or III, usually SG III, extending for at least 15 segments; notopodia as short cones, notochaetae originating from central core on top, distal lobes absent; notochaetae winged, sometimes with bulbous head and alimbate tips (bayonet-like chaetae), at least in anterior row of anterior thoracic segments. Neuropodia beginning posteriorly to notopodia, usually around SG VIII���XII; neuropodia in conjunction with notopodia as sessile tori, as distinctly low pinnules after notopodia terminate; neurochaetae in single row, as avicular uncini about as long as high, with short triangular heel directed posteriorly, wide and slightly curved base, and dorsal button near midlength of uncini, but closer to anterior margin (Fig. 4E). Nephridial and genital papillae, if conspicuous, on SG V���VII, posterior to bases of notopodia. Remarks This recent family was described by Nogueira et al. (2013) after conducting a comprehensive phylogenetic analysis. The members of this family were previously considered as Thelepodidae but differ in having a narrow and elongate upper lip, poorly developed neuropodia and anterior segments less glandular ventrally than in other thelepodids. In European waters, this family is represented by a single species, Parathelepus collaris (Figs 3A���B, 4A, E; Table 1), characterised by an expanded, tongue-like upper lip, by neuropodia poorly developed and beginning from SG XI., Published as part of Lavesque, Nicolas, Hutchings, Pat, Londo��o-Mesa, Mario H., Nogueira, Jo��o M. M., Daffe, Guillemine, Nygren, Arne, Blanchet, Hugues, Bonif��cio, Paulo, Broudin, Caroline, Dauvin, Jean-Claude, Droual, Gabin, Gouillieux, Benoit, Grall, Jacques, Guyonnet, Benjamin, Houbin, C��line, Humbert, Suzie, Janson, Anne-Laure, Jourde, J��r��me, Labrune, C��line, Lamarque, Bastien, Latry, Lise, Garrec, Vincent Le, Pelaprat, Corine, Pezy, Jean-Philippe, Sauriau, Pierre-Guy & Montaudouin, Xavier De, 2021, The " Spaghetti Project ": the final identification guide to European Terebellidae (sensu lato) (Annelida, Terebelliformia), pp. 108-156 in European Journal of Taxonomy 782 (1) on page 124, DOI: 10.5852/ejt.2021.782.1593, http://zenodo.org/record/5781605, {"references":["Nogueira J. M. M., Fitzhugh K. & Hutchings P. 2013. The continuing challenge of phylogenetic relationships in Terebelliformia (Annelida: Polychaeta). Invertebrate Systematics 27: 186 - 238. https: // doi. org / 10.1071 / IS 12062.","Nogueira J. M. M., Carrerette O., Hutchings P. & Fitzhugh K. 2018. Systematic review of the species of the family Telothelepodidae Nogueira, Fitzhugh & Hutchings, 2013 (Annelida, Terebelliformia), with descriptions of three new species. Marine Biology Research 14: 217 - 257. https: // doi. org / 10.1080 / 17451000.2017.1401729.","Hutchings P., Nogueira J. M. N. & Carrerette O. 2021 a. Terebellidae Johnston, 1846. In: Schmidt- Rhaesa A. Hr., Beutel R. G., Glaubrecht M., Kristensen N. P., Prendini L., Purschke G., Richter S., Westheide, W. & Leschen R. Z. E. (eds) Handbook of Zoology. A Natural History of the Phyla of the Animal Kingdom: 1 - 64. Walter de Gruyter & Co, Berlin."]}

Family Thelepodidae Hessle, 1917 Figs 1F, 3���4 Diagnosis (after Hutchings et al. 2021a, most important diagnostic characters highlighted in bold) Transverse prostomium attached to dorsal surface of upper lip; basal part as thick crest, eyespots frequently present, in short lateral rows, or extending transversely across basal part of prostomium, usually progressively more spaced towards dorsal mid-line, with mid-dorsal gap or not; distal part of base of upper lip short, from nearly indistinct to shelf-like. Buccal tentacles all uniformly thin and cylindrical, to slightly spatulate distally (Figs 3D, F, 4B). Peristomium forming lips, sometimes also complete annulation, with dorso-lateral nuchal organs as ciliated grooves; lips expanded, relatively short upper lip, hood-like, about as long as wide; swollen, button-like, mid-ventral lower lip (Figs 3D, F, 4B���C). Segment 1 usually present all around, frequently with ventral lobe marginal to mouth (Figs 3D, F, 4B���C); SG II typically with anterior margin as protruding crest, at least ventrally (Figs 3D���E, 4B���C); lobes on following anterior segments sometimes present. Anterior segments highly glandular ventrally, smooth to highly corrugated between neuropodia within pairs, discrete shields absent (Figs 3D F, 4B); mid-ventral groove frequently extending from anterior segments with notopodia. Two to three pairs of branchiae, on SG II���III or II���IV, each pair with simple thin, curled and relatively short filaments progressively tapering to tips (Figs 3C, E, 4C), leaving mid-dorsal gap or not between filaments within pairs; branchial filaments originating directly from the body wall or from specialised dorsolateral cushion-like pads. Notopodia beginning on SG II���III, usually extending to mid-body, at least, sometimes until near posterior end; cylindrical to rectangular, distally bilobed notopodia, notochaetae originating between lobes; most taxa with winged notochaetae only, with wings of variable width (Fig. 4D), distally serrated notochaetae sometimes also present; bayonet-like and pinnate chaetae both absent. Neuropodia beginning posteriorly to notopodia, on SG IV���VI, typically on SG V; neuropodia in conjunction with notopodia as fleshy, swollen ridges, as raised rectangular to cylindrical pinnules after notopodia terminate; neurochaetae as avicular uncini frequently longer than high, with short triangular heel directed posteriorly, distinctly curved and wide base, and dorsal button near anterior margin of uncini, or within anterior third of distance between anterior margin of uncini and base of main fang (Fig. 4F). Nephridial and genital papillae usually present, on SG IV���VII, posterior to bases of notopodia or between parapodial lobes (Fig. 3C). Remarks A comprehensive phylogenetic analysis conducted by Nogueira et al. (2013) permitted the elevation of the previous Thelepodinae subfamily to Thelepodidae family level, as they represented a separate clade from other terebellids. This family is represented in European waters by three genera Euthelepus McIntosh, 1885 (a single species), Streblosoma Sars, 1872 (seven species) and Thelepus Leuckart, 1849 (nine species) (Table 1). Among these species, Thelepus japonicus Marenzeller, 1884, native from Japan, is considered as a non-indigeneous species in French waters, probably introduced with oyster transfers (Lavesque et al. 2020a) (Fig. 3C). Main morphological characters of European species BRANCHIAE. Both in Thelepus and Streblosoma genera, the number of pairs of branchiae varies between two (e.g., Streblosoma lindsayae or Thelepus nucleolata) and three (e.g., Streblosoma hutchingsae or Thelepus setosus). Branchiae in Thelepodidae are always cirriform (Figs 3C, E, 4C) but the number of branchial filaments varies among the species with for example 5���10 filaments on the second and third pairs of branchiae for Streblosoma cabiochi (Fig. 3E) and only three or less filaments for Streblosoma intestinale. Finally, the size of the medial dorsal gap separating the pairs of branchiae is a good diagnostic character. This gap is for example inconspicuous for T. parapari and wide for Thelepus cincinnatus (Nogueira 2019). PRESENCE OF EYESPOTS. The eyespots are very useful in differentiating species of Streblosoma and Thelepus for which they can be absent (e.g., Thelepus davehalli or Streblosoma hutchingsae) or present (e.g.m Thelepus corsicanus or Streblosoma nogueirai). Also, the arrangement of the eyespots, if in a continuous line, or leaving a medial gap is of taxonomic importance (Nogueira et al. 2010). START AND EXTENSION OF NOTOPODIA. The segment with the first appearance of notopodia permits the discrimination between the genus Streblosoma, for which notopodia begin on the second segment, and Euthelepus and Thelepus for which it begins on the third segment. These notopodia also extend for a variable number of segments, sometimes present only on the anterior half of the body (e.g., T. corsicanus) or present until the end of the body (T. japonicus). SHAPE OF NEUROPODIA AND UNCINI. In most of the species, the uncini start on SGV which could correspond to CH 3 (as in Thelepus) or CH 4 (as in Streblosoma). The uncini are arranged habitually in single rows but some have uncini forming loops (C-shaped arrangement) from mid thorax onwards. This last character is found for example in S. nogueirai. Between species, the uncini differ in the development of the prow (e.g., well developed in T. triserialis), the shape of the base (e.g., strongly curved in S. cabiochi), the position of the dorsal button (e.g., far from anterior margin in S. bairdi or in a terminal position for T. japonicus (Fig. 1F) and number of secondary of teeth. CREST AND LATERAL LOBES. The presence of lateral lobes on SG II���IV allows the separation of the genus Euthelepus from other genera of the family. The presence of lateral crests on SG II (= thick anterior margin) is an important character within the Streblosoma genus. For example, S. cabiochi has a very low crest on SG II (Fig. 4C) while S. bairdi has a protruding crest (Nogueira 2019). Key to European species of Thelopodidae (after Lavesque et al. 2020a ) 1. Notopodia from SG II (i.e., first branchiferous segment), start of uncini from CH 4.............................................................................................................................................................2 (Streblosoma) ��� Notopodia from SG III (i.e., second branchiferous segment), start of uncini from CH 3.................. 8 2. Two pairs of branchiae................................................................................................................................................................ Streblosoma lindsayae Lavesque, Londo��o-Mesa, Daffe & Hutchings, 2020 ��� Three pairs of branchiae.................................................................................................................... 3 3. Uncini arranged in C-shaped loops from mid thorax....................................................................... 4 ��� Uncini always in straight rows......................................................................................................... 6 4. Notopodia not extending to posterior body...................................................................................... 5 ��� Notopodia until posterior body................. Streblosoma pseudocomatus Lezzi & Giangrande, 2019 5. Eyespots absent.............................................. Streblosoma hutchingsae Lezzi & Giangrande, 2019 ��� Eyespots present................................................. Streblosoma nogueirai Lezzi & Giangrande, 2019 6- Branchiae on SG III and SG IV with 3 or less filaments on each side.......................................................................................................................... Streblosoma intestinale M. Sars in G.O. Sars, 1872 ��� Branchiae on SG III and SG IV with 5���10 filaments on each side.................................................. 7 7. Absence of prostomial process, presence of lateral crest on SG II, absence of branchial cushion............................................. Streblosoma cabiochi Lavesque, Londo��o-Mesa, Daffe & Hutchings, 2020 ��� Presence of prostomial process, absence of lateral crest on SG II, presence of branchial cushion................................................................................... Streblosoma bairdi (Malmgren, 1866) 8. Lateral lobes on SG II���IV................................................. Euthelepus setubalensis McIntosh, 1885 ��� Lateral lobes on SG I only.............................................................................................. 9 (Thelepus) 9. Two pairs of branchiae.................................................................................................................... 10 ��� Three pairs of branchiae................................................................................................................. 15 10. Uncini in a single row throughout...................................................................................................11 ��� Uncini in loops from SG XIV.............................................. Thelepus nucleolata (Clapar��de, 1870) 11. Notopodia present on 50���66% of body length............................................................................... 12 ��� Notopodia present on at least 90% of body length......................................................................... 13 12. Eyespots absent................................................................................ Thelepus davehalli Jirkov, 2018 ��� Eyespots present.............. Thelepus corsicanus Lavesque, Londo��o-Mesa, Daffe & Hutchings, 2020 13. Uncini of CH 1 with one tooth above main fang............................................................................ 14 ��� Uncini of CH 1 with two teeth above main fang............................. Thelepus parapari Jirkov, 2018 14. Eyespots present................................................................. Thelepus cincinnatus (Fabricius, 1780) ��� Eyespots absent................................................................................. Thelepus marthae Jirkov, 2018 15. Prow of uncini well developed; notch between the prow and dorsal button of the uncini well marked......................................................................................... Thelepus triserialis (Grube, 1855) ��� Prow of uncini poorly developed; notch between the prow and dorsal button of the uncini poorly marked............................................................................................................................................ 16 16. Notopodia present on about 60% of the body length............. Thelepus setosus (Quatrefages, 1866) ��� Notopodia present until end of the body length.................... Thelepus japonicus Marenzeller, 1884, Published as part of Lavesque, Nicolas, Hutchings, Pat, Londo��o-Mesa, Mario H., Nogueira, Jo��o M. M., Daffe, Guillemine, Nygren, Arne, Blanchet, Hugues, Bonif��cio, Paulo, Broudin, Caroline, Dauvin, Jean-Claude, Droual, Gabin, Gouillieux, Benoit, Grall, Jacques, Guyonnet, Benjamin, Houbin, C��line, Humbert, Suzie, Janson, Anne-Laure, Jourde, J��r��me, Labrune, C��line, Lamarque, Bastien, Latry, Lise, Garrec, Vincent Le, Pelaprat, Corine, Pezy, Jean-Philippe, Sauriau, Pierre-Guy & Montaudouin, Xavier De, 2021, The " Spaghetti Project ": the final identification guide to European Terebellidae (sensu lato) (Annelida, Terebelliformia), pp. 108-156 in European Journal of Taxonomy 782 (1) on pages 124-129, DOI: 10.5852/ejt.2021.782.1593, http://zenodo.org/record/5781605, {"references":["Hessle C. 1917. Zur Kenntnis der terebellomorphen Polychaeten. Zoologiska bidrag fran Uppsala 5: 39 - 258. Available from https: // www. biodiversitylibrary. org / page / 38891407 [accessed 8 Nov. 2021].","Hutchings P., Nogueira J. M. N. & Carrerette O. 2021 a. Terebellidae Johnston, 1846. In: Schmidt- Rhaesa A. Hr., Beutel R. G., Glaubrecht M., Kristensen N. P., Prendini L., Purschke G., Richter S., Westheide, W. & Leschen R. Z. E. (eds) Handbook of Zoology. A Natural History of the Phyla of the Animal Kingdom: 1 - 64. Walter de Gruyter & Co, Berlin.","Nogueira J. M. M., Fitzhugh K. & Hutchings P. 2013. The continuing challenge of phylogenetic relationships in Terebelliformia (Annelida: Polychaeta). Invertebrate Systematics 27: 186 - 238. https: // doi. org / 10.1071 / IS 12062.","McIntosh W. C. 1885. Report on the Annelida Polychaeta collected by H. M. S. Challenger during the years 1873 - 1876. Report on the Scientific Results of the Voyage of H. M. S. Challenger during the years 1873 - 76. Zoology 12: 1 - 554. Available from https: // www. biodiversitylibrary. org / page / 50688432 [accessed 8 Nov. 2021].","Sars G. O. 1872. Diagnoser af nye Annelider fra Christianiaforden, efter Professor M. Sar's efterladte Manuskripter. Forhandlinger i Videnskabs-Selskabet i Christiania 1871: 406 - 417. Available from https: // biodiversitylibrary. org / page / 44067540 [accessed 8 Nov. 2021]","Leuckart R. 1849. Zur Kenntnis der Fauna von Island. Archiv fur Naturgeschichte 15 (1): 149 - 208.","Marenzeller E. 1884. Sudjapanische Anneliden. II. Ampharetea, Terebellacea, Sabellacea, Serpulacea. Denkschriften der Akademie der Wissenschaften, Mathematisch-Naturwissenschaftliche Classe 49 (2): 197 - 224.","Lavesque N., Londono-Mesa M. H., Daffe G. & Hutchings P. 2020 a. A revision of the French Telothelepodidae and Thelepodidae (Annelida, Terebelliformia), with descriptions of three species and first European record of a non-indigenous species. Zootaxa 4810 (2): 305 - 327. https: // doi. org / 10.11646 / zootaxa. 4810.2.4","Nogueira J. M. M. 2019. Redescriptions of Streblosoma bairdi (Malmgren, 1866) and Thelepus cincinnatus (Fabricius, 1780), based on types and material from type localities. Zootaxa 4544 (3): 419 - 428. https: // doi. org / 10.11646 / zootaxa. 4544.3.7","Nogueira J. M. M., Hutchings P. & Fukuda M. V. 2010. Morphology of terebelliform polychaetes (Annelida: Polychaeta: Terebelliformia), with a focus on Terebellidae. Zootaxa 2460 (1): 1 - 185. https: // doi. org / 10.11646 / zootaxa. 2460.1.1","Lezzi M. & Giangrande A. 2019. New species of Streblosoma (Thelepodidae, Annelida) from the Mediterranean Sea: S. pseudocomatus sp. nov., S. nogueirai sp. nov. and S. hutchingsae sp. nov. Journal of Natural History 52 (43 - 44): 2857 - 2873. https: // doi. org / 10.1080 / 00222933.2018.1556357","Malmgren A. J. 1866. Nordiska Hafs-Annulater. Ofversigt af Kongliga Vetenskaps-Akademiens Forhandlingar 22: 355 - 410. Available from https: // www. biodiversitylibrary. org / part / 244483 [accessed 8 Nov. 2021].","Claparede E. 1870. Les annelides chetopodes du Golfe de Naples. Supplement. Memoires de la Societe de Physique et d'Histoire naturelle de Geneve 20 (2): 365 - 542. https: // doi. org / 10.5962 / bhl. title. 2142","Fabricius O. 1780. Fauna Groenlandica, systematice sistens, Animalia Groenlandiae occidentalis hactenus indagata, quoad nomen specificum, triviale, vernaculumque synonyma auctorum plurium, descriptionem, locum, victum, generationem, mores, usum, capturamque singuli prout detegendi occasio fuit, maximaque parte secundum proprias observations. Impensis Ioannis Gottlob Rothe, Copenhagen et Leipzig [Hafniae et Lipsiae]. https: // doi. org / 10.5962 / bhl. title. 13489","Grube A. E. 1855. Beschreibungen neuer oder wenig bekannter Anneliden. Archiv fur Naturgeschichte 21 (1): 81 - 136. Available from https: // doi. org / 10.5962 / bhl. part. 13989 [accessed 8 Nov. 2021].","Quatrefages A. de. 1866. Note sur la Classification des Annelides. Annales des Sciences Naturelles 5: 253 - 296."]}

Hesiospina legendrei sp. nov. (Figs. 2���4) Type material: NE Pacific Ocean, Endeavour Segment (Juan de Fuca Ridge), Grotto site (47��56.958���N, 129��5.899���W), 2196 m depth, collected by ROV Jason 6���7 September 2015, Dive J 0831: Holotype, MNHN-IA- TYPE 1845, J0831-S1 incomplete specimen, length 13.27 mm, width 1.72 mm, 37 segments, accession GenBank MH349482 for 16S and MH349485 for COI; Paratype 1, MNHN-IA-TYPE 1846, J0831-S3 incomplete specimen, length 11.51 mm, width 1.73 mm, 33 segments, accession GenBank MH349481 for 16S and MH349484 for COI; Paratype 2, MNHN-IA-TYPE 1847, J0831-S1 complete specimen, length 11.17 mm, width 1.05 mm, 43 segments, accession GenBank MH349480 for 16S and MH349483 for COI; Paratype 3, MNHN-IA-TYPE 1848, J0831-S3 complete specimen, length 13.94 mm, width 1.20 mm, 50 segments; Paratype 4, MNHN-IA-TYPE 1849, J0831-S3 complete specimen, length 12.18 mm, width 1.35 mm, 42 segments. Additional material: NE Pacific Ocean, Endeavour Segment (Juan de Fuca Ridge), Grotto site (47��56.958���N, 129��5.899���W), 2196 m depth, collected by ROV Jason 6���7 September 2015, Dive J0831: Additional material 1 MNHN-IA-PNT 82, J0831-S3 incomplete specimen, length 12.99 mm, width 1.39 mm, 30 segments; Additional material 2 MNHN-IA-PNT 83, J0831-S3 incomplete specimen, length 11.33 mm, width 1.20 mm, 38 segments; Additional material 3 MNHN-IA-PNT 84, J0831-S3 incomplete specimen, length 11.46 mm, width 1.03 mm, 40 segments; Additional material 4 MNHN-IA-PNT 85, J0831-S2 incomplete specimen, length 13.65 mm, width 1.19 mm, 38 segments; Additional material 5 MNHN-IA-PNT 86, J0831-S2 incomplete specimen, length 12.28 mm, width 1.06 mm, 34 segments; Additional material 6 MNHN-IA-PNT 87, J0831-S2 incomplete specimen used to SEM. NE Pacific Ocean, Endeavour Segment (Juan de Fuca Ridge), Grotto site (47��56.958���N, 129��5.899���W), 2196 m depth, collected by ROV ROPOS 19 May 2014: Additional material 7 MNHN-IA-PNT 88, ONC 2014 R1689 incomplete specimen, length 11.36 mm, width 1.30 mm, 29 segments; Additional material 8 MNHN-IA- PNT 89, ONC 2014 R1689 complete specimen, length 19.55 mm, width 1.21 mm, 47 segments Description (based on holotype and paratypes): Moderate-sized species, up to 19.55 mm long, up to 50 segments; dorsoventrally cylindrical anteriorly and posteriorly slightly flattened; live specimen not observed; ethanol preserved pale yellow to white; from segment 4���5, ventral-posterior part of neuropodia slightly inflated, with slight to dark brownish pigmentation. Prostomium wider than long, trapezoid, anteriorly wide, slightly notched posteriorly (Fig. 2A, 4A). Two antennae, smooth, thin, slightly tapering, long (as long as palpophores and palpostyle) with rounded tips, inserted on anterior margin close to palpophores; without median antenna. Palpophores cylindrical, slightly annulated, long (shorter than prostomium length) with palpostyle ovoid, thinner, shorter (about 1/3 of palphophores; Fig. 2A). Eyes absent. Nuchal organs as a patch of pores located laterally to prostomium (Fig. 4A). Everted proboscis large, thick, bulbous (as long as the first 6 segments when everted; Fig. 2A); basally encircled with numerous, small, conical, pointed papillae (increasing in size distally), ranged in about 21���27 poorly defined vertical rows with 2���5 papillae by row; medially with a pair of large, sac-like structures, inflated, distally with 7���13 digitiform extensions, inserted ventro-laterally; distally with 20���27 elongate, thin, similar-sized papillae; not ciliated (Fig. 2A, B); two pairs of small, delicate jaws, both pairs basally jointed, dorsal pair anteriorly rounded, ventral pair anteriorly slightly pointed (Fig. 2C, D). Dorsal cirri articulated, in segments 1���4 as tentacular cirri, very long (reaching 9 subsequent segments) with well-developed, cylindrical cirrophores; in subsequent segments, style shorter, long (reaching 2���5 subsequent segments) with smaller cirrophores. Ventral cirri in segments 1���4 slightly articulated, long (reaching 4 subsequent segments) with well-developed, cylindrical cirrophores; in subsequent segments, style not articulated, slightly thinner, short (reaching distal neuropodia margin) with indistinct cirrophores, inserted subdistally (Fig. 3A). Parapodia subbiramous (Fig. 3A). Notopodia reduced to small lobe; in segments 1���5 with 5���6 internal, slender aciculae; from segment 6 (chaetiger 2) to last segments with single internal, stouter acicula; from segments 7���8 (chaetigers 3���4) to last segments with single stout protruding hook (plate-like striae), very gently curved distally, with blunt to slightly pointed tips, emerging from small lobe located anteriorly to dorsal cirrophore (Fig. 3A���B, 4B). Neuropodia well-developed, subtriangular, from segment 5 (chaetiger 1) to last segments; pre-chaetal lobe developed, triangular with pointed, prominent tips; post-chaetal not so developed, triangular, shorter, prominent (Fig. 3A). Neurochaeta starting from segment 5 (chaetiger 1) to last segments of 2 types: (a) single stout, simple, long, slightly curved chaeta, with blunt tips, located closer to the neuroacicula (Fig. 3F, 4C); and (b) numerous (about 30���36 observed), slender, composite heterogomph falcigers with faintly serrated (Fig. 3C, E, 4G), tapering blades, with prolonged subdistal tooth and unidentate tips (Fig. 3C, E, 4F, H); medial blades at least 4 times longer than the inferiormost chaetae on fascicle, some with distinct, bigger or prolonged teeth series near base of blade (Fig. 3E, 4D���E); few (1���2 observed) inferiormost neurochaeta with elongated hood (Fig. 3C���D, 4I). All chaetae shafts, aciculae and hooks internally camerated (not drawn). Pygidium as simple ring, bulbous, termino-dorsally located; last 2 segments very reduced. Morphological variation: Few morphological variations were observed, for instance protruding hook appearing from segment 7 or 8 (chaetigers 3���4), occurred each case in half of analysed specimens. The number of distal papillae in the proboscis varied from 20 to 27 and seems to be linked to age-size (2 worms with everted proboscis). Few specimens in bad conditions presented the protruding hook accompanied externally by the internal acicula appearing to have ���2 protruding hooks���. The holotype presented one segment with pre-chaetal lobe having slightly bifurcate tips in anterior region while the additional material 7 MNHN-IA-PNT 88 presented pre-chaetal lobe with bifurcate tips in few anterior segments. Furthermore, some specimens presented crenulated post-chaetal lobes without defined pattern, probably linked to an artefact of fixation. Etymology: The new species is named in honour of Dr. Pierre Legendre (Universit�� de Montr��al) for his many contributions to marine ecology and deep-sea research. Genetic data: DNA sequencing, for holotype and paratypes 1 and 2, was successful for 16S (404 to 421 bp length) and COI (504 to 687 bp length). Intraspecific variation for COI divergence was of 0.0% (Table 2). điagonal) anđ p-đistance (below điagonal) in MEGA7. ������continued on the next page ������continued on the next page Distribution: Grotto edifice within Main Endeavour vent field (Juan de Fuca Ridge; 2196 m depth). Ecological notes: Leli��vre et al. (2018) provided the first characterization of the biodiversity, community structure and trophic ecology in Grotto hydrothermal edifice (Main Endeavour, Juan de Fuca Ridge) which showed a site dominated by dense populations of tubeworms Ridgeia piscesae. Associated to this species, 35 other taxa can be found as well, mainly represented by gastropods and polychaetes, along the 6 sampled stations in this study. Among the 19 species of polychaetes observed associated to Ridgeia piscesae, Hesiospina legendrei sp. nov. was found in 3 out of 6 sampled stations with abundance varying between 9.8 and 14.3 ind.m -2. The same study found highest ��15N values and suggested the new species H. legendrei sp. nov. being among the top predators in the benthic food web. Remarks: Together with Hesiospina aurantiaca and H. vestimentifera, H. legendrei sp. nov. is the third species described in the genus. Hesiospina aurantiaca ���which lives mostly in shallow waters of the Atlantic, Caribbean, and western Pacific���can be easily differentiated from the hydrothermal vent taxa (H. vestimentifera and H. legendrei sp. nov.) by the presence of a protruding hook distally curved, elongate palpostyles, eyes present, proboscis unarmed and absence of papillae in basal part of proboscis (Pleijel 2004). Hesiospina vestimentifera and H. legendrei sp. nov. are both found in hydrothermal vent environments and share similarities such as: protruding hook slightly curved, ovoid palpostyle, eyes absent, proboscis with jaws and presence of papillae in basal part of proboscis. However, H. legendrei sp. nov. can be differentiated from H. vestimentifera, by having a sac-like structure (Fig. 2A���B) present ventro-laterally in proboscis (absent in H. vestimentifera). Furthermore, H. legendrei sp. nov. differs from H. vestimentifera, in having a greater number of distal papillae (about 20���27 observed) versus 13���14 (Blake 1985) or 10���15 (Pleijel 2004), notopodial hook from segment 7���8 (chaetigers 3���4) instead of segment 8���9 (chaetigers 4���5), and notopodia lobes with multiple slender aciculae in only the first 5 segments instead of the first 4 segments in H. vestimentifera. The elongate hood present in very few composite neurochaetae in H. legendrei sp. nov. seems to be a unique character among this genus but it should be investigated in the other species because it was rarely observed in our specimens. Moreover, genetic divergences support the new species with high Kimura 2-parameter distance (K2P) and p-distance for COI gene (Table 2) varying respectively from 12.9 % and 11.8% between H. legendrei sp. nov. and H. cf. vestimentifera sp. 3 GR-2017 to 22.0% and 18.8% between H. legendrei sp. nov. and H. vestimentifera. It needs to be highlighted here two observations: (a) the type locality of H. vestimentifera is G��lapagos Rift (Blake 1985) but the only available DNA sequence was provided from one specimen sampled in Tui Malila, Lau Basin (about 1900 m depth; Pleijel et al. 2012); and (b) extreme values were observed between the sequence identified as H. cf. aurantiaca MB-2010 and all others resulting in the exclusion of the COI sequence from this species of phylogenetic analysis., Published as part of Bonif��cio, Paulo, Leli��vre, Yann & Omnes, Emmanuelle, 2018, A new species and phylogenetic insights in Hesiospina (Annelida, Hesionidae), pp. 59-75 in Zootaxa 4441 (1) on pages 63-70, DOI: 10.11646/zootaxa.4441.1.3, http://zenodo.org/record/1301961, {"references":["Lelievre, Y., Sarrazin, J., Marticorena, J., Schaal, G., Day, T., Legendre, P., Hourdez, S. & Matabos, M. (2018) Biodiversity and trophic ecology of hydrothermal vent fauna associated with tubeworm assemblages on the Juan de Fuca Ridge. Biogeosciences, 15, 2629 - 2647. https: // doi. org / 10.5194 / bg- 15 - 2629 - 2018","Pleijel, F. (2004) A revision of Hesiospina (Psamathini, Hesionidae, Polychaeta). Journal of Natural History, 38, 2547 - 2566. https: // doi. org / 10.1080 / 00222930310001647433","Blake, J. A. (1985) Polychaeta from the vicinity of deep-sea geothermal vents in the Eastern Pacific. I: Euphrosinidae, Phyllodocidae, Hesionidae, Nereididae, Glyceridae, Dorvilleidae, Orbiniidae, and Maldanidae. Bulletin of the Biological Society of Washington, 6, 67 - 101.","Pleijel, F., Rouse, G. W., Sundkvist, T. & Nygren, A. (2012) A partial revision of Gyptis (Gyptini, Ophiodrominae, Hesionidae, Aciculata, Annelida), with descriptions of a new tribe, a new genus and five new species. Zoological Journal of the Linnean Society, 165, 471 - 494. https: // doi. org / 10.1111 / j. 1096 - 3642.2012.00819. x"]}

Genus Hesiospina Imajima & Hartman 1964. Type species: Kefersteinia similis Hessle 1925. Diagnosis (based on Pleijel 1998, 2004): Number of segments variable. Prostomium about rectangular. Facial tubercle present or absent. Palps biarticuled; palpophores well developed; palpostyles ovoid or tapered. Median antenna absent; paired antenna present. Two pairs of eyes present or absent. Nuchal organs middorsally coalescing. Lip glands absent. Terminal ring of proboscis with more than 10 papillae; ventral incision absent; dorsal and ventral jaws plates present or absent. Enlarged dorsal cirri on segments 1���5, from segment 6 (chaetiger 1) dorsal cirri long; enlarged ventral cirri on segments 1���4. Protruding notopodial hooks present from median segments; notochaetae absent. Neuropodial lobe and neurochaetae present from segment 5 (chaetiger 1); blades of compound neurochaetae with uni- or bidentate tips. Ventral cirri inserted subdistally. Pygidium as a simple ring or cone with pair of anal cirri., Published as part of Bonif��cio, Paulo, Leli��vre, Yann & Omnes, Emmanuelle, 2018, A new species and phylogenetic insights in Hesiospina (Annelida, Hesionidae), pp. 59-75 in Zootaxa 4441 (1) on page 63, DOI: 10.11646/zootaxa.4441.1.3, http://zenodo.org/record/1301961, {"references":["Imajima, M. & Hartman, O. (1964) The polychaetous annelids of Japan. Allan Hancock Foundation Publications: Occasional Papers, 26, 1 - 452.","Hessle, C. (1925) Einiges uber die Hesioniden und die Stellung der Gattung Ancistrosyllis. Arkiv for Zoologi, 17, 1 - 36.","Pleijel, F. (1998) Phylogeny and classification of Hesionidae (Polychaeta). Zoologica Scripta, 27, 89 - 163. https: // doi. org / 10.1111 / j. 1463 - 6409.1998. tb 00433. x","Pleijel, F. (2004) A revision of Hesiospina (Psamathini, Hesionidae, Polychaeta). Journal of Natural History, 38, 2547 - 2566. https: // doi. org / 10.1080 / 00222930310001647433"]}