Parethusa glabra 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 : 587

Parethusa glabra Chen, 1997

Parethusa glabra Chen, 1997: 614 , figs 1, 2.

TYPE MATERIAL. — Holotype: cl 8. 2 mm, cw 7.9 mm, KARUBAR, stn CP 35 ( MNHN-B 22886 ).

TYPE LOCALITY. — Indonesia, Kai Islands, 06°08’S, 132°45’E, 390- 502 m.

MATERIAL EXAMINED. — Indonesia. Kai Islands, KARUBAR, stn CP 35, 06°08’S, 132°45’E, 390- 502 m, 27.X.1991, 1 holotype ( MNHN-B 22886). Fiji. BORDAU 1, stn CP 1393, 16°45’S, 179°59’E, 426-487 m, 23.II.1999, 1 juv. cl 4.9 mm, cw 4.5 mm ( MNHN-B 28680). — Stn CP 1395, 16°45’S, 179°59’E, 423-500 m, 23.II.1999, 2, 2 cl 9. 9 mm, cw 10.2 mm and 10.8 mm, cw 10.5 mm respectively ( MNHN-B 28681). — Stn CP 1447, 16°45’S, 179°59’E, 420-513 m, 4.III.1999, 1 ( MNHN-B 28682).

DISTRIBUTION. — Indonesia (Kai Is [ Chen 1997]) and now from Fiji. Depth: 390-513 m ( Fig. 34 ).

SIZE. — Maximum size: cl 8.7 mm, cw 8.0 mm (MNHN-B 28682), cl 10.8 mm, cw 10.5 mm (MNHN-B 28681).

REMARKS

Both the genus and the species were described from only one specimen, a male. The finding of three females from other locations now permits their description.

The carapace of females is, like that of males, of an inflated appearance, dorsally flat and smooth, and slightly longer than broad. In a small juvenile female (cl 4.9 mm, cw 4.5 mm, MNHN-B 28680) the outer orbital teeth are straight (not slightly directed inwardly as in the adults), the distal ends of the frontal teeth are acute, and the outer angles of the frontal teeth (distalmost tip of the inner margins of the orbital sinuses) are acuminate but clearly do not form distinct teeth. Otherwise, the anterior border of the carapace of the adult females is identical to that of the male holotype (MNHN-B 22886; Chen 1997: fig. 1a, b). The chelipeds are nearly equal, smooth, the propodi 2.8 times as long as high and only slightly longer than the fingers. The broad abdomen (narrow in a juvenile female) consists of six somites and a rounded telson, with somite 4 the broadest and somite 6 the longest. All other details agree with those given by Chen (1997: 615) in the description of the male holotype.

Figures

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