Amaeana gremarei, Lavesque & Hutchings & Daffe & Londoño-Mesa, 2020

Lavesque, Nicolas, Hutchings, Pat, Daffe, Guillemine & Londoño-Mesa, Mario H., 2020, Revision of the French Polycirridae (Annelida, Terebelliformia), with descriptions of eight new species, Zootaxa 4869 (2), pp. 151-186 : 155-158

publication ID	https://doi.org/ 10.11646/zootaxa.4869.2.1
publication LSID	lsid:zoobank.org:pub:50310045-52DE-4D53-AA0A-683D2FA87F5D
DOI	https://doi.org/10.5281/zenodo.4418216
persistent identifier	https://treatment.plazi.org/id/55253A24-4F83-4ED4-85E2-523329D141F9
taxon LSID	lsid:zoobank.org:act:55253A24-4F83-4ED4-85E2-523329D141F9
treatment provided by	Plazi
scientific name	Amaeana gremarei
status	sp. nov.

Treatment

Amaeana gremarei View in CoL n. sp.

Figures 2–3 View FIGURE 2 View FIGURE 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 GoogleMaps . 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 GoogleMaps 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 View FIGURE 2 ), both basal and distal parts developed, basal part as thickened crest ( Fig. 2C View FIGURE 2 ), distal part with large lateral lobes and also oval mid-dorsal process ( Fig. 2C View FIGURE 2 ); prostomium covering SG1 laterally and terminating laterally to lower lip, near mouth ( Fig. 2D View FIGURE 2 ). Only few buccal tentacles remaining, short ones thin, uniformly cylindrical, intermediate ones (only on paratype AM W.53110) distally broader, spatulate ( Fig. 2 View FIGURE 2 C–D). Peristomium restricted to lips, upper lip almost circular, wider than long, single lobe only ( Figs 2 View FIGURE 2 C–D; 3A); lower lip large, almost rounded, as long as wide ( Figs 2 View FIGURE 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 View FIGURE 2 ); 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 View FIGURE 2 ). Segments biannulated, SG1 short, visible dorsally and ventrally, laterally covered by expanded prostomium ( Figs 2D View FIGURE 2 ; 3A View FIGURE 3 ); SG 2 narrower and shorter than following segments, with large pentagonal to hexagonal mid-ventral shield at beginning of mid-ventral groove ( Figs 2D View FIGURE 2 ; 3A View FIGURE 3 ), 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 View FIGURE 2 C–D; 3A). Ventro-lateral pads on SG3–13; with transverse ridges but without longitudinal groove ( Figs 2D View FIGURE 2 ; 3A View FIGURE 3 ).

Notopodia from SG3, extending through 10 segments, until segment 12 ( Fig. 2A View FIGURE 2 ); distinctly elongate, rectangular with rounded distal part, with equal lobes ( Fig. 3C View FIGURE 3 ). 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 View FIGURE 3 C–D). Neuropodia present from SG17 (hard to see exactly), laterally to mid-ventral groove, on outer margins of longitudinal crests ( Fig. 2A View FIGURE 2 ). Neurochaetae up to 8–9 thin, long spines, with all tips broken ( Fig. 3B View FIGURE 3 ).

Nephridial and genital papillae at anterior bases of first nine notopodia ( Fig. 2B View FIGURE 2 ).

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 ).