Ethusina bicornuta Chen, 1997

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 : 549

Ethusina bicornuta Chen, 1997

Ethusina bicornuta Chen, 1997: 622 , fig. 6. — Ng & Ho 2003: 72 (list).

TYPE MATERIAL. — Holotype:, cl 7.2 mm, cw 7.0 mm, KARUBAR, stn CP 87 ( MNHN-B 22885 ).

TYPE LOCALITY. — Indonesia, Tanimbar Islands, 09°37’S, 160°41.7’E, 1017-1024 m.

MATERIAL EXAMINED. — Indonesia. Tanimbar Islands, KARUBAR, stn CP 87, 08°47’S, 130°49’E, 1017-1024 m, 5.XI.1991, 1 holotype ( MNHN-B 22885).

Solomon Islands. SALOMON 1, stn CP 1751, 09°10.4’S, 156°53’E, 749-790 m, 25.IX.2001, 1 ( MNHN-B 28674). — Stn CP 1858, 08°47’S, 130°49’E, 435-461 m, 7.X.2001, 1 ( MNHN-B 28669).

DISTRIBUTION. — Tanimbar Is, Indonesia ( Chen 1997) and now from the Solomon Is. Depth: 435- 1024 m ( Fig. 34 ).

SIZE. — Maximum size: cl 7.8 mm, cw 7.6 mm ( MNHN-B 28674); unknown.

REMARKS

Ethusina bicornuta is known from only three male specimens. Diagnostic to this species is the presence of two distal horn-like structures on each G1 ( Chen 1997: fig. 6g, h). The first two abdominal somites are nearly equal in the holotype ( MNHN-B 22885) but the first somite is longer than the second in larger individuals. The eye peduncles are very short ( Chen 1997: fig. 6b). The inner margin of the orbital sinus has a very slight but noticeable elevation that gives the margin a slightly uneven appearance.

Figures

FIG. 34. — Bathymetric distribution of Indo-West Pacific ethusine crabs.