Lamprophaea poupini, Salazar-Vallejo, 2020

Salazar-Vallejo, Sergio I., 2020, Revision of Leocrates Kinberg, 1866 and Leocratides Ehlers, 1908 (Annelida, Errantia, Hesionidae), Zootaxa 4739 (1), pp. 1-114 : 45-46

Lamprophaea poupini n. sp.

Figs 2D , 24

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Type material. Western Pacific, French Polynesia. Holotype ( UF 858 ), Society Islands , Moorea, Temae, northern end, near lighthouse, outer reef slope (17°28’44.40” S, 149°45’51.48” W), rubble cracking, 29 m, 17 Oct. 2008, J. Poupin, coll.

Description. Holotype (UF 858) complete, bent ventrally, with adsorbed salt particles along integument ( Fig. 24A ). Body blunt anteriorly, wider medially, tapered posteriorly, 32 mm long, 4 mm wide, 16 chaetigers; most cirri missing; right parapodium of chaetiger 9 removed for observing parapodial features. Body blackish, darker along chaetigers 1–6, progressively paler therafter; parapodia and venter pale; some remaining dorsal cirri blackish to finely banded.

Prostomium wider than long, widest medially, tapered posteriorly ( Fig. 24B ). Lateral antennae with ceratophores distinct, longer than prostomium and palps; palpophores three times longer than palpostyles. Median antenna long, surpassing anterior prostomial margin, inserted centrally on prostomium, among eyes.

Eyes dark brown, anterior ones reniform or markedly emarginate, twice larger and more distant to each other than posterior, round eyes ( Fig. 24B ).

Nuchal organs lobes L-shaped, lateral projections completely blackish, slightly progressively expanded, projected beyond lateral prostomial margins; lateral ciliated bands wide, visible dorsally. Tentacular cirri almost all missing, one ventral cirrus without tip surpasses chaetiger 2. Lateral cushions swollen in middle and posterior chaetigers; longitudinal striae visible.

Pharynx almost fully everted ( Figs 2D , 24C ). Lateral vesicles not seen. Anterior margin with 18 regular wide lobes. Jaws single, dorsal one large, hyaline to yellowish, larger and closer to anterior margin than ventral jaw.

Dorsal cirri without tips, as long as body width. Chaetigers 1–3 without notochaetae; notochaetae present along chaetigers 4–16, about 60 per bundle, arranged as transverse fans in most chaetigers; notochaetae subdistally denticulate, denticles coarse. Notacicular lobes tapered, 2–3 times longer than wide ( Fig. 24D ); aciculae black, tapered; ventral cirri tapered, surpassing neurochaetal lobe. Neuracicular lobe rectangular, slightly longer than wide, neurochaetae about 30 per bundle, some blades missing, blades decreasing in size ventrally, bidentate, 2–11 times longer than wide, guards smooth, approaching subdistal tooth.

Posterior end tapered. Prepygidial segment with dorsal cirri without tips, three times longer than ventral ones. Pygidium with anus terminal, anal cirri missing.

Oocytes not seen. Gonad fragments in parapodial spaces include only spermatids.

Etymology. This species is named to honor Dr. Joseph Poupin, Institut de Recherche, École Navale et Groupe des Écoles du Poulmic, a well-known expert on decapod crustaceans from the tropical Indian and Pacific Oceans, because he collected the specimen used to describe the species. The species-group name is a noun in the genitive case ( ICZN 1999, Art. 31.1.2).

Remarks. Lamprophaea poupini n. sp. belongs in the group with notochaetae from chaetiger 4, and resembles L. paulayi n. sp. from the Red Sea by having reniform anterior eyes, twice larger than posterior round eyes. The two main differences between these two species are that in L. poupini lateral antennae are longer than palps, and neuracicular lobes are rectangular, whereas in L. paulayi lateral antennae are as long as palps, and neuracicular lobes are blunt, conical.

Distribution. The holotype was collected in rubble, in coralline substrates in 29 m depth in Moorea, Society Islands.

Figures

FIGURE 2. A. Leocrates claparedii (Costa in Claparède, 1868), non-type specimens (USNM 5131), anterior end, dorsal view, pharynx everted. B. Another specimen, anterior end, dorsal view, pharynx fully everted. C. Same, pharynx and jaws, left lateral view (1: Pharynx ring I, 2: Pharynx ring II, AM: anterior margin, DT: dorsolateral tubercle, LJ: lower jaw, LV: lateral vesicle, Pe: peristomium, TB: tentacular belt, UJ: upper jaw). D. Lamprophaea poupini n. sp., holotype (UF 858), anterior end, right lateral view, after SAS (1–8: tentacular cirri, Ch: chaetiger, LA: lateral antenna, NO: nuchal organ lobe, Pa: palp, TB: tentacular belt). Scale bars: A, C: 0.5 mm, B: 0.7 mm, D: 0.3 mm.

FIGURE 24. Lamprophaea poupini n. sp., holotype (UF 858). A. Anterior region, dorsal view. B. Anterior end, dorsal view, SAS. C. Pharynx, frontal view, SAS. D. Chaetiger 9, right parapodium, anterior view. E. Upper and lower neurochaetal blades. Scale bars: A: 1.1 mm, B, D: 0.8 mm, C: 0.9 mm, E: 130 µm.