Ommatocarcinus granulatus Chen, 1998

Castro, Peter, 2007, A reappraisal of the family Goneplacidae MacLeay, 1838 (Crustacea, Decapoda, Brachyura) and revision of the subfamily Goneplacinae, with the description of 10 new genera and 18 new species, Zoosystema 29 (4), pp. 609-774 : 737

Ommatocarcinus granulatus Chen, 1998

Ommatocarcinus granulatus Chen, 1998: 285 , 310 [in list], 312, fig. 13.

TYPE MATERIAL. — ♀ holotype ( IOAS SSIVB45-30).

TYPE LOCALITY. — South China Sea, Nansha Is, 04°26.0’N, 111°0’E, 107 m.

DISTRIBUTION. — Known only from the South China Sea. Depth: 107 m.

REMARKS

Male specimens and additional material of O. granulatus , which is known only from the female holotype from the South China Sea, should be examined and compared to the other known species of Ommatocarcinus . The illustration and English description by Chen (1998: 312, fig. 13), however, show clear differences from O. fibriophthalmus : absence of anterolateral teeth or prominences, a wider carapace, and the presence of a small distal tooth on the meri of each of the ambulatory legs (P2-P5). These characters, however, are also present in O. macgillivrayi , and Chen (1998: 313) contrasts her new species with O. pulcher Barnard, 1950 but not with O. macgillivrayi . Ommatocarcinus granulatus can be differentiated from O. macgillivrayi by the relative length of their eye peduncles. The peduncles extend a considerable distance, about a third of its total length, beyond the outer orbital teeth in O. granulatus ( Chen 1998: fig. 13-1) but only the distal margin of the eye itself extends beyond the outer orbital teeth in O. macgillivrayi . The cheliped (P1) merus has small teeth along the dorsal border and another small tooth on the distal border of the cheliped in O. granulatus ( Chen 1998: fig. 13-4), in contrast to a large obtuse tooth on the median portion of the outer (dorsal) margin of the merus in O. macgillivrayi . The carapace is noticeably narrower in O. granulatus : “1.82-1.86 times as broad as long” ( Chen 1998: 313) but wider, carapace width 2.3 times carapace length, in O. macgillivrayi .