Ethusina dofleini Ihle, 1916

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 : 560

Ethusina dofleini Ihle, 1916

Ethusina abyssicola dofleini Ihle, 1916a: 360 ; 1916b: 147, 151 (list), 153 (list), 156 (list). — Serène 1968: 40 (list).

Ethusa (Ethusina) abyssicola – Doflein 1904: 31, pl. 13, figs 1, 2 (not Ethusa abyssicola Smith, 1884 ).

Ethusina abyssicola – Gore 1983: 211 (not Ethusa abyssicola Smith, 1884 ).

Ethusina dofleini – Chen 1993: 336 (key).

TYPE MATERIAL. — Holotype of Ethusina abyssicola dofleini Ihle, 1916 : cl 6.4 mm, cw 6.8 mm, Siboga ,

stn 210a, 05°26’S, 121°18’E, 1944 m ( ZMA Crust.De 100714).

TYPE LOCALITY. — Indonesia, Celebes, Gulf of Bone, 05°26’S, 121°18’E, 1944 m.

MATERIAL EXAMINED. — Indonesia. Celebes, Siboga , stn 210a, 1944 m, 1 holotype ( ZMA Crust.De 100714).

DISTRIBUTION. — Zanzibar ( Doflein 1904, as Ethusa (Ethusina) abyssicola ) and Celebes, Indonesia ( Ihle 1916b). Depth: 1944 m ( Ihle 1916b), 2950 m ( Doflein 1904) ( Fig. 34 ).

SIZE. — Maximum size: cl 6.4 mm, cw 6.8 mm (ZMA Crust.De 100714), unknown.

REMARKS

Ihle (1916b) described Ethusina dofleini as a subspecies of E. abyssicola Smith, 1884 , an Atlantic species (see discussion of E. challengeri above), based on a male specimen collected by the Valdivia expedition off Zanzibar, East Africa ( Doflein 1904) and a second male specimen he identified from Celebes, Indonesia. Doflein’s specimen, originally deposited at ZMB, is no longer extant. His description and photograph ( Doflein 1904: 31, pl. 13, figs 1, 2), however, for the most part conforms to Ihle’s holotype (ZMA Crust.De 100714).

Ethusina dofleini is very close to E. challengeri ( Miers, 1886) . It can be separated from E. challengeri by the expanded, arrow-shaped tips of the G1 (narrow and with rounded tips in E. challengeri ; Fig. 16C ) and by the small eyes that are barely visible dorsally (much larg- er, oval eye peduncles that taper anteriorly toward the eye and eyes that are visible dorsally in E. challengeri ; Fig. 16A ; Miers 1886: pl. 28, fig. 2).

The outer orbital teeth, much reduced in E. dofleini , are similar to those of E. brevidentata Chen, 1993 , and E. ocellata n. sp.

Figures

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

FIG. 16. — Ethusina challengeri (Miers, 1886), cl 12.6 mm, cw 12.1 mm, Mozambique Basin, SAFARI 1, stn 1, trawl CP 01, 2608 m (MNHN-B 8775); A, dorsal surface of carapace; B, ventral view of anterior portion of body; C, right G1, ventral (left) and dorsal (right) views; D, left G2, dorsal view. Scale bars: A, 5 mm; B, D, 2 mm; C, 1 mm.