Leocratides kimuraorum Jimi, Tanaka & Kajihara, 2017

Salazar-Vallejo, Sergio I., 2020, Revision of Leocrates Kinberg, 1866 and Leocratides Ehlers, 1908 (Annelida, Errantia, Hesionidae), Zootaxa 4739 (1), pp. 1-114 : 80-81

Leocratides kimuraorum Jimi, Tanaka & Kajihara, 2017

Leocratides kimuraorum Jimi, Tanaka & Kajihara, 2017: 134–137 , Figs 1–2 . Type material. Japan. Holotype (NSMT H-622) and 5 paratypes ( NSMT 623–624 ), off Shima Peninsula, TR / V Seisui-maru, Sta. 1 (34°11.63’ N, 136°42.56’ E to 34°11.66’ N, 136°42.69’ E), demosponge and hexactinellid sponges, 103–104 m, 12 Oct. 2016, N. Jimi, coll. [holotype 29 mm long, 5 mm wide; paratypes 11–19 mm long, 2 mm wide (not seen)].

Diagnosis. Leocratides with peristomial dorsolateral tubercles with two round marginal lobes. Neuracicular lobes as long as wide, mucronate. Venter with black spots along middle and posterior segments, 1–2 spots one behind the other, and two larger spots transversely arranged in each neuropodial area.

Remarks. Leocratides kimuraorum Jimi, Tanaka & Kajihara, 2017 was described recently partially on the basis of specimens previously recorded as L. filamentosus by Imajima (2003: 136–138, Fig. 80); such that the species needs no redescription. As indicated in the key above, L. kimuraorum resembles L. ehlersi ( Horst, 1921) because both have peristomial dorsolateral ridges with a few to none lobes, and by having some ventral pigmentation. These species differ, however, by the type of neuracicular lobes and pigmentation patterns. In L. kimuraorum neuracicular lobes are as long as wide and mucronate, and ventral pigmentation is spotty, not continuous, whereas in L. ehlersi neuracicular lobes are twice longer than wide, triangular but non-mucronate, and pigmentation is a continuous brownish band.

Distribution. Off Shima Peninsula, Japan, in sponges, 103–104 m depth.

Figures

FIGURE 1. Anterior end in dorsal view and exposed pharynx in frontal or oblique ventral view, rearranged after Pettibone (1970). A. Leocrates claparedii (Costa in Claparède, 1868), anterior end. B. Same, exposed pharynx. C. Leocrates oculatus (Treadwell, 1906), anterior end. D. Same, exposed pharynx. E. Leocrates diplognathus (Monro, 1926), anterior end. F. Same, exposed pharynx. G. Leocratides filamentosus Ehlers, 1908. H. Same, exposed pharynx. Scale bars: A, B: 0.4 mm, C, D, F: 0.8 mm, E: 0.3 mm, G, H: 1.0 mm (asterisk indicates nuchal organ; De: denticles; DJ: double jaw; DT: dorsolateral tubercles; LV: lateral vesicle, SJ: single jaw; TJ: transverse jaw) (Images produced by Marian Pettibone; reproduced with permission of the National Museum of Natural History, Smithsonian Institution).

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.