Amaeana gremarei Lavesque & Hutchings & Daffe & Londoño-Mesa 2020, n. sp.
Creators: name: Lavesque, Nicolas
name: Hutchings, Pat
name: Daffe, Guillemine
name: Londoño-Mesa, Mario H.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Terebellida
Terebellidae
Amaeana
Amaeana gremarei

description: Amaeana gremarei n. sp.
Figures 2–3
Material examined: Holotype: MNHN-IA-TYPE 2006, incomplete, Mediterranean Sea, Gulf of Lion, 42°31’36”N, 3°23”47’E, 110 m depth, June 2019, posterior parapodia mounted for SEM. Paratypes: AM W.53110, incomplete, Mediterranean Sea, Gulf of Lion, A90, 42°32’39”N, 3°16’03”E, 90 m depth, April 2018. AM W.53111, incomplete, Mediterranean Sea, Gulf of Lion, Reserve St Troc, 42°29’01”N, 3°08’48”E, 31 m depth, 2017, mounted for SEM.
Description. Large species, holotype incomplete, 16.4 (8.0–22.2) mm long and 2.2 (2.0–2.8) mm wide.
Prostomium at base of upper lip (Fig. 2D), both basal and distal parts developed, basal part as thickened crest (Fig. 2C), distal part with large lateral lobes and also oval mid-dorsal process (Fig. 2C); prostomium covering SG1 laterally and terminating laterally to lower lip, near mouth (Fig. 2D). Only few buccal tentacles remaining, short ones thin, uniformly cylindrical, intermediate ones (only on paratype AM W.53110) distally broader, spatulate (Fig. 2 C–D). Peristomium restricted to lips, upper lip almost circular, wider than long, single lobe only (Figs 2 C–D; 3A); lower lip large, almost rounded, as long as wide (Figs 2 C–D; 3A).
Body progressively broader until SG7–8, then gradually tapering to narrower uniformly cylindrical posterior body, beginning from SG13–14 (Fig. 2A); achaetous gap between termination of notopodia and beginning of neuropodia, corresponding to SG13–16, with poorly marked segmentation, longer than region with notopodia (Fig. 2A). Segments biannulated, SG1 short, visible dorsally and ventrally, laterally covered by expanded prostomium (Figs 2D; 3A); SG 2 narrower and shorter than following segments, with large pentagonal to hexagonal mid-ventral shield at beginning of mid-ventral groove (Figs 2D; 3A), extending anteriorly through segment 1 until near ventral edge of lower lip. Ventrum highly glandular, covered by small papillae on SG2–11, less conspicuous on S13, then smooth body wall, with paired longitudinal crests bordering mid-ventral groove through posterior body (Figs 2 C–D; 3A). Ventro-lateral pads on SG3–13; with transverse ridges but without longitudinal groove (Figs 2D; 3A).
Notopodia from SG3, extending through 10 segments, until segment 12 (Fig. 2A); distinctly elongate, rectangular with rounded distal part, with equal lobes (Fig. 3C). Notochaetae in both rows with narrow limbs (light microscopy), with fine hairs under SEM, emerging from the ventral face of notopodia to distal part (Fig. 3 C–D). Neuropodia present from SG17 (hard to see exactly), laterally to mid-ventral groove, on outer margins of longitudinal crests (Fig. 2A). Neurochaetae up to 8–9 thin, long spines, with all tips broken (Fig. 3B).
Nephridial and genital papillae at anterior bases of first nine notopodia (Fig. 2B).
Pygidium unknown.
Etymology. This species is dedicated to Antoine Grémare for his many contributions to benthic ecology and his important support to NL and Céline Labrune, who sent us type material.
Habitat. Coastal heterogeneous sands, 30–100 m depth.
Type locality. Gulf of Lion, Mediterranean Sea, France.
Distribution. Only known from type locality.
Remarks. Among the valid species of this genus, a single species is known from European waters: A. trilobata. Amaeana gremarei n. sp. is similar to this species by both having 10 pairs of notopodia. However, Amaeana gremarei n. sp. differs in having a circular upper lip without distinct lobes (instead of upper lip with three lobes for A. trilobata), by a rounded lower lip, wider than long (instead of rectangular broad one as found in A. trilobata), by nephridial papillae on SG3–11 (instead of SG3–12 for A. trilobata), by a long achaetous region (instead of a short one as occurs in A. trilobata) and by ventro-lateral pads on SG3–13 (instead of on SG3–12 for A. trilobata).
description: Published as part of Lavesque, Nicolas, Hutchings, Pat, Daffe, Guillemine & Londoño-Mesa, Mario H., 2020, Revision of the French Polycirridae (Annelida, Terebelliformia), with descriptions of eight new species, pp. 151-186 in Zootaxa 4869 (2) on pages 155-158, DOI: 10.11646/zootaxa.4869.2.1, http://zenodo.org/record/4418481