taxonID	type	description	language	source
DE221921277B6A4EFCCFFE42FB8FDCFA.taxon	materials_examined	Type species: Amphitrite cirrata Müller, 1771.	en	Jirkov, Igor A., Ravara, Ascensão, Cunha, Marina R. (2018): Amphitrite fauveli sp. n. (Polychaeta: Terebellidae) from the Bay of Biscay and the Gulf of Cadiz (NE Atlantic). Invertebrate Zoology 15 (1): 85-91, DOI: 10.15298/invertzool.15.1.06, URL: https://doi.org/10.15298/invertzool.15.1.06
DE221921277B6A4EFCCFFE42FB8FDCFA.taxon	diagnosis	DIAGNOSIS. Three pairs of branchia on S 2, S 3 and S 4. Lateral lobes small. Notopodia present from S 4, notochaetae of two types: long and smooth, bilimbate and short, geniculated with serrated tips. Uncini avicular without manubrium, from C 8 in double rows (double rows neuropodia) at least to the end of thorax.	en	Jirkov, Igor A., Ravara, Ascensão, Cunha, Marina R. (2018): Amphitrite fauveli sp. n. (Polychaeta: Terebellidae) from the Bay of Biscay and the Gulf of Cadiz (NE Atlantic). Invertebrate Zoology 15 (1): 85-91, DOI: 10.15298/invertzool.15.1.06, URL: https://doi.org/10.15298/invertzool.15.1.06
DE221921277B6A4BFCF3FCE9FB46DC3F.taxon	description	Figs 2 – 4. Material examined. Atlantic Ocean. Bay of Biscay. Tributary of Cap Breton canyon, St M 84 - 5 _ 677, 214 m, 1 large specimen (NHM ANEA 2017.194, Holotype); Saint Nazaire canyon, St M 84 - 5 _ 649, 1105 m, 1 specimen (DBUA 0001973). Gulf of Cadiz: Darwin MV, St B 09 - 14 b _ 02 W, 1100 m, 1 gravid female (DBUA 0001953); St TTR 16 _ AT 608, 1115 m, 1 specimen without branchae on one side (DBUA 0001962); Captain Arutynov MV, St MSM 01 / 3 _ 212, 1317 m, 1 small specimen (DBUA 0001963). DESCRIPTION (based on holotype and paratypes). Length up to 80 mm, 5 mm width, near 100 S. Buccal tentacles short, near 1 / 5 of body length. Eyespots absent. Branchiae consisting of numerous cirriform filaments attached directly to short thick symmetric wart like stem, which is small in the smaller worms and larger in holotype (Fig. 2 C). Number of filaments in the holotype: BS 1 — 15, BS 2 — 10, BS 3 — 8. Specimen from St MSM 01 / 3 _ 212 has no branchia on the left side of S 1 and on the right side of S 3; no scars were found. S 1 forms a small lower lip (Fig. 2 E, F). Lobes of S 2 – S 4 distinct (Fig. 2 F, G): S 2 — low, lateral dorsal margin higher and disappearing ventrally; S 3 — semicircular reaching the upper margin of first uncinigerous row, S 4 — smaller and more dorsal, slowly disappearing ventrally. 17 TC. Ventral pads until C 10, smooth (Fig. 2 E). Notochaetae long and smooth, bilimbate and short, geniculated with serrated tips (Fig. 3). Uncini avicular from C 2 facing forward, similar in thorax (Fig. 4 A) and abdomen (Fig. 4 B), but the thoracic ones slightly larger and with a more developed heel. On C 8 – C 17 the uncini are in double rows, face-to-face, with rows well apart (Fig. 4 C). All abdominal uncini in single rows facing forward. Thoracic unicinigerous rows large, the nine anterior almost reaching the ventral pads (Fig. 2 E). Length of the uncinigerous row of TU 1 slightly smaller than TU 2, but in all anterior neuropodia equal to or larger than the width of the widest ventral pad. All thoracic neuropodia are tori (transversal cushion, uncini are situated in a medial furrow Fig. 2 H TC 17), abdominal neuropodia gradually transformed into fan-like rectangular pinnules posteriorly (Fig. 2 H AU 1, AU 26), but uncini are not situated at the margin as it is in pinnuli of Ampharetidae. Uncinigerous row of AU 1 half the length of the row from last TU. A pair of nephridial papillae present in S 3 (BS 2) laterally to branchiae, very large, almost half the size of notopodia of TC 1 (BS 3); absent in S 4 and S 5; present again between notopodiaandneuropodiaofS 6 – S 8, muchsmall- er than in S 3 (Fig. 2 F). The gravid female presents inflated shields instead of papillae in S 6 – S 8, papillae of S 3 normally developed (Fig. 2 G). Pygidium with crenulated margins, without papillae. DIFFERENTIAL DIAGNOSIS. Three species of Amphitrite have cirriform branchia. The new species differs from two of them by the smaller number of nephridial papillae (8 in A. cirrata, 7 in A. kerguelensis, 4 in A. fauveli sp. n.). The third species A. oculata from Japan and Australia has also four segments with nephridial papillae but it has eyespots, absent in A. fauveli sp. n.	en	Jirkov, Igor A., Ravara, Ascensão, Cunha, Marina R. (2018): Amphitrite fauveli sp. n. (Polychaeta: Terebellidae) from the Bay of Biscay and the Gulf of Cadiz (NE Atlantic). Invertebrate Zoology 15 (1): 85-91, DOI: 10.15298/invertzool.15.1.06, URL: https://doi.org/10.15298/invertzool.15.1.06
DE221921277B6A4BFCF3FCE9FB46DC3F.taxon	discussion	REMARKS. A. cirrata profunda Fauvel, 1909 was recorded from off the Azores and Morocco at depths between 778 – 1287 m and probably is the same species as described here. However, according to the International Code of Zoological Nomenclature (ICZN, 1999), A. cirrata profunda should be interpreted as nomen nudum as it fails to conform to Article 12 (Article 12.1: “ To be available, every new name published before 1931 … must be accompanied by a description or a definition of the taxon that it denotes ”). The only sentence describing this taxon is “ Ils sont principalement caractérisés par le petit nombre et la forme relativement trapue de leurs filets branchiaux ” (Fauvel, 1909: 26) which can not be interpreted as a description or definition of a taxon. The number of cirri of the single branchia depends on the size of worm, while the shape of cirri depends on degree of relaxation during fixation. Thus none of the characters mentioned by Fauvel (1909) allow us to distinguish this taxon from the ones previously known. Furthermore, Solís-Weiss et al. (2004) did not list Fauvel’s material in the collection of the Muséum national d’Histoire naturelle, Paris where to all alcohol-preserved specimens were transferred. So there is no other way than to describe the new species.	en	Jirkov, Igor A., Ravara, Ascensão, Cunha, Marina R. (2018): Amphitrite fauveli sp. n. (Polychaeta: Terebellidae) from the Bay of Biscay and the Gulf of Cadiz (NE Atlantic). Invertebrate Zoology 15 (1): 85-91, DOI: 10.15298/invertzool.15.1.06, URL: https://doi.org/10.15298/invertzool.15.1.06
DE221921277B6A4BFCF3FCE9FB46DC3F.taxon	etymology	ETYMOLOGY. The species is named after Prof. P. Fauvel who reported A. cirrata profunda, a probable synonym of the new species. Acknowledgements Thanks are due to the chief-scientists, scientific parties and crews of the cruises TTR 16 (RV Prof. Logatchev, Training Through Research Programme, IOC-UNESCO), MSM 01 - 03 (RV Maria S Merian), and B 09 - 14 b (RV Belgica). This work was supported by CESAM (UID / AMB / 50017 / 2013) financed by FCT / MEC through national funds and co-funded by the FEDER within the PT 2020 Partnership Agreement and Compete 2020, by EURODEEP / 0001 / 2007 (project CHEMECO, ESF EuroDEEP programme), by the European Commission Sixth Framework Programme (FP 6) under the HERMES project (EC contract GOCE-CT- 511234), and by Seventh Framework Programme (FP 7) under the HERMIONE project (EC contract 226354). The first author was supported by the Fauna Ibérica project (Fauna Ibérica XI: Polychaeta VI: Palpata-Canalipalpata I, CGL 2014 - 53332 - C 5 - 3 - P) and by the Russian Science Foundation (grant number 14 - 50 - 00029) for investigation within Russia. The second author was supported by a postdoctoral grant (SFRH / BPD / 112408 / 2015) from FCT co-financed by ESF.	en	Jirkov, Igor A., Ravara, Ascensão, Cunha, Marina R. (2018): Amphitrite fauveli sp. n. (Polychaeta: Terebellidae) from the Bay of Biscay and the Gulf of Cadiz (NE Atlantic). Invertebrate Zoology 15 (1): 85-91, DOI: 10.15298/invertzool.15.1.06, URL: https://doi.org/10.15298/invertzool.15.1.06
