Cyrtomaia cornuta Richer de Forges & Guinot, 1988

Ahyong, Shane T., 2008, Deepwater crabs from seamounts and chemosynthetic habitats off eastern New Zealand (Crustacea: Decapoda: Brachyura), Zootaxa 1708 (1), pp. 1-72 : 35

Cyrtomaia cornuta Richer de Forges & Guinot, 1988

( Fig. 16A )

Cyrtomaia cornuta Richer de Forges & Guinot, 1988: 44 , fig. 3A–C, pl. 2a–e [type locality: Northern Norfolk Ridge, S of New Caledonia]. — Webber & Richer de Forges 1995: 509–510. — Richer de Forges & Ng 2007: 62, 65–67, fig. 5A, C.

Material examined. Main Cavalli Seamount: NIWA 14182 , 1 male (cl 46.9 mm), 34°04.32–04.74’S, 174°04.08–04.75’E, 630– 560 m, KAH0204/21, 16 Apr 2002 .

Off Coromandel Peninsula: NIWA 14189 , 1 ovigerous female (cl 53.9 mm), 37°00.64’S – 36°57.67’S, 176°16.38–17.07’E, 410 m, KAH9801/29, Z9013, 23 Jan 1998 ; NIWA 14194 , 1 ovigerous female (cl 53.8 mm), 36°28.72–26.74’S, 176°13.36–12.97’E, 526– 510 m, KAH0001/61, Z10010 , 17 Feb 2000 .

Off Great Barrier Island: NIWA 14188 , 1 male (cl 46.8 mm), 36°00.88–02.89’S, 176°15.13–15.27’E, 482– 474 m, KAH0001/64, Z10013 , 18 Feb 2000 .

Builders Pencil cold seep: NIWA 29389 , 1 damaged male, 39°32.59–32.65’S, 178°20.19–19.62’E, 815– 819 m, TAN0616/38, 6 Nov 2006 .

Remarks. The specimens agree well in most respects with the type description and additional data provided by Richer de Forges & Ng (2007). Two males (NIWA 14182, 29389), however, have smooth, rather than finely granular P5 meri as reported by Richer de Forges & Webber (1995) for specimens from northern New Zealand. Cyrtomaia cornuta is readily distinguished from C. lamellata Rathbun, 1906 , the only other congener known from New Zealand, by the long and slender, rather than minute rostral spines.

Distribution. New Caledonia and northern New Zealand; a first record of the species from a cold seep; 270– 819 m.

Figures

FIGURE 16. Carapace. A, Cyrtomaia cornuta Richer de Forges & Guinot, 1995, male, cl 46.9 mm (NIWA 14182), dorsal view. B–C, Dorhynchus ramusculus (Baker, 1906), male, cl 13.3 mm (NIWA 9941), right lateral and dorsal views. D, Platymaia maoria Dell, 1963, ovigerous female, cl 55.8 mm (NIWA 14191). E, Vitjazmaia latidactyla Zarenkov, 1994, ovigerous female, cl 72.0 mm (NIWA 16800).