Parathelepus collaris ( Southern, 1914 ), 2018

Lavesque, Nicolas, Londoño-Mesa, Mario H., Daffe, Guillemine & Hutchings, Pat, 2020, 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), pp. 305-327 : 309-311

publication ID	https://doi.org/ 10.11646/zootaxa.4810.2.4
publication LSID	lsid:zoobank.org:pub:F26D46F0-FC66-4835-B0D8-836E24B3B5F4
persistent identifier	https://treatment.plazi.org/id/03CCFD55-4347-6A7B-10D1-FCEEFF41FF09
treatment provided by	Plazi
scientific name	Parathelepus collaris ( Southern, 1914 )
status

Treatment

Parathelepus collaris ( Southern, 1914) View in CoL

Figures 2–3 View FIGURE 2 View FIGURE 3

Thelepides collaris Southern, 1914: 125–126 View in CoL , pl. XIII, fig. 30A–E.

Parathelepus collaris ( Southern, 1914) Nogueira et al. 2018 View in CoL , fig. 7.

Material examined: AM W.53063, one specimen, complete in two parts, Northeast Atlantic Ocean , Bay of Biscay, P12, 44°28’25”N 1°24’37”W, 51 m depth, May 2018 GoogleMaps , mounted for SEM. MNHN-IA- PNT 115, one specimen, complete, Northeast Atlantic Ocean , Bay of Biscay, P22, 44°03’03”N 1°28’05”W, 52 m depth, May 2018 GoogleMaps . AM W.53064, one specimen, anterior part, Northeast Atlantic Ocean , Bay of Biscay, P16, 44°23’00”N 1°23’51”W, 44 m depth, May 2018 GoogleMaps . MNHN-IA- PNT 116, one specimen, anterior part, Northeast Atlantic Ocean , Bay of Biscay, P18, 44°13’22”N 1°25’47”W, 50 m depth, May 2018 GoogleMaps . AM W.53065, one specimen, anterior part, Northeast Atlantic Ocean , Bay of Biscay, P22, 44°03’03”N 1°28’05”W, 52 m depth, May 2018 GoogleMaps .

Description. Specimens relatively small; complete entire specimen 31 mm long and 1.2 mm wide.

Transverse prostomium attached to dorsal surface of upper lip; eyespots in broad oblique row at each side, terminating dorso-laterally ( Fig. 2A View FIGURE 2 ); distal part with poorly developed mid-dorsal process. Buccal tentacles of one type, very long, cylindrical and deeply grooved ( Figs 2A View FIGURE 2 ; 3 View FIGURE 3 A–B). Peristomium forming lips, continuing dorsally as narrow annulation, upper lip much longer than wide, convoluted ( Figs 2 View FIGURE 2 A–C; 3A–B); lower lip expanded, cushionlike ( Fig. 2C View FIGURE 2 ), extending across entire venter and covering SG1 ventrally ( Fig. 3B View FIGURE 3 ). Anterior body highly glandular ventrally, swollen, mid-ventral shields absent ( Fig. 3 View FIGURE 3 B–C), mid-ventral groove extending from SG13; SG1 only conspicuous dorsally and laterally, terminating laterally to expanded lower lip; SG2 forming complete ring, SG3–10 progressively longer, anterior margins with ventral crests until SG8 ( Figs 2 View FIGURE 2 B–C; 3A).

Two pairs of branchiae on SG2–3, each pair with few (up to 2–3 on either side) relatively thick filaments progressively tapering to tips ( Figs 2A View FIGURE 2 ; 3 View FIGURE 3 A–B); branchial filaments originating in a line on anterior margin of SG2–3, those of SG2 extending laterally beyond level of notopodia; filaments from left and right sides within each pair separated by wide medial gap ( Figs 2A View FIGURE 2 ; 3 View FIGURE 3 A–B).

Notopodia from SG3 to SG17; notopodia of SG3–7 inserted progressively more laterally, then aligned longitudinally; anterior notopodia with bulbous and hirsute bayonet-like chaetae in anterior row ( Fig. 3D View FIGURE 3 ), and narrowly-winged hirsute notochaetae in posterior row, chaetae of posterior row longer. Posterior notochaetae narrowlywinged in both rows.

Neuropodia from SG11, as low ridges throughout; uncini as long as high, or slightly higher than long, with dorsal button at mid-length of base, short triangular heel and with 3 rows of teeth above the main fang ( Figs 2D View FIGURE 2 ; 3 View FIGURE 3 E–F).

Lateral nephridial openings on SG5–7 ( Fig. 3C View FIGURE 3 ). Pygidium crenulated.

Habitat. Rocky bottoms, 27 m depth ( Southern 1914), mud to muddy sands, 80 to 120 m depth ( Martinez et al. 2007), coarse sand, 40 to 50 m depth (this study). Type locality. Clew Bay, County Mayo, Ireland. Distribution. Azores ( Gil 2011), Bay of Biscay (this study, Martinez et al. 2007), Ireland ( Southern 1914), Egypt ( Abd-Elnaby 2009), Italy ( Giangrande 1988). Remarks. Characteristics of the French material closely matches the description of the holotype recently published by Nogueira et al. (2018). Our specimens differ only by the presence of a third row of teeth above the main fang of uncini (instead of two as described by Nogueira et al. 2018). However, this third row is only visible with SEM images. SEM images also permit us to observe for the first time the presence of nephridial openings on SG5 to 7.