Ethusina somalica ( Doflein, 1904 ) Castro, 2005

Castro, Peter, 2005, Crabs of the subfamily Ethusinae Guinot, 1977 (Crustacea, Decapoda, Brachyura, Dorippidae) of the Indo-West Pacific region, Zoosystema 27 (3), pp. 499-600 : 575

publication ID	https://doi.org/ 10.5281/zenodo.5399909
DOI	https://doi.org/10.5281/zenodo.5475562
persistent identifier	https://treatment.plazi.org/id/264A053E-4E60-B568-7184-FC0773C0C35C
treatment provided by	Marcus
scientific name	Ethusina somalica ( Doflein, 1904 )
status	comb. nov.

Treatment

Ethusina somalica ( Doflein, 1904) View in CoL n. comb.

Ethusa somalica Doflein, 1904: 30 View in CoL , 210, 211, 213, 151, 291 (list), pl. 13, figs 5, 6, 64, pl. 44, figs 4, 5. — Ihle 1916b: 153 (list), 155 (list). — Serène 1968: 40 (list). — Chen 1993: 317 (key), 319 (list).

TYPE MATERIAL. — Holotype: cl 7. 3 mm, cw 7.2 mm, Deutsche Tiefsee Expedition, Valdivia , stn 258 ( ZMB 13628).

TYPE LOCALITY. — Somalia, off southern coast, 2°58.5’S, 46°50.8’E, 1362 m.

MATERIAL EXAMINED. — Somalia. Deutsche Tiefsee Expedition, Valdivia , stn 258, 2°58.5’S, 46°50.8’E, 1362 m, 1 holotype ( ZMB 13628).

DISTRIBUTION. — Known only from southern Somalia. Depth: 1362 m ( Fig. 34 View FIG ).

SIZE. — Maximum size: cl 7.3 mm, cw 7.2 mm (ZMB 13628), unknown.

REMARKS

Ethusina somalica n. comb., known only from the female holotype (ZMB 13628), was erroneously described as a species of Ethusa . It clearly belongs to Ethusina as the basal antennular article is enlarged and swollen, making the eye peduncles and eyes only partially visible dorsally. The P2 and P3 are slender and long, clearly extending well over the frontal teeth when folded ( Doflein 1904: pl. 13, figs 5, 6).

There are very close similarities with E. robusta , from which it can be differentiated by having much longer P2 and P3 (in holotype, P2 meri 1.2 times cl, meri 11 times broad as long). These pereopods extend a considerable distance over the frontal teeth when folded ( Doflein 1904: pl. 13, figs 5, 6), whereas in E. robusta they extend to just above the frontal teeth. The outer orbital teeth are slender and are directed outwardly, and the lateral frontal teeth are particularly slender, longer than the triangular frontal teeth and almost as long as the outer orbital teeth (teeth barely visible in Doflein 1904: pl. 13, fig. 5).