Kallograea, Peter & L., 2025

Guinot, Danièle & Ng, Peter K. L., 2025, Kallograea kulolasi n. gen., n. sp. and K. jolliveti (Guinot & Segonzac, 2018) from the hydrothermal Kulo Lasi Volcano Caldera, West Pacific; and a reappraisal of Austinograea Hessler & Martin, 1989 and Gandalfus McLay, 2007 (Decapoda, Brachyura, Bythograeoidea), Zoosystema 47 (33), pp. 773-797 : 778

Kallograea n. gen.

urn:lsid:zoobank.org:act:

TYPE SPECIES. — Kallograea kulolasi n. sp., by present designation.

OTHER INCLUDED SPECIES. — Austinograea jolliveti Guinot & Segonzac, 2018 (see below).

ETYMOLOGY. — The name is derived from the Greek “ kallo ” for “beautiful”, and the name for marine crabs “ graea ” (cf. Liddell & Scott 1940); alluding to the slender and delicate chelipeds of the two constituent species. The gender is feminine.

DIAGNOSIS. — Carapace transversely elliptical. Dorsal surface of carapace almost flat; regions indistinct. Eyestalk absent, podophthalmite fused to floor of orbital region; cornea absent, no visible pigment. Antennules, antennae recessed under front. Mxp3 ischium distinctly elongate; merus subtriangular, distally produced. Adult male chelipeds prominently elongate; merus long, slender; palm elongated (especially in K. kulolasi n. sp.), with setal patch either exclusively on inner surface and between fingers of both chelipeds ( K. jolliveti n. comb.) or on either side of superior margin (including the superior margin itself), thus on both sides of palm and extending between fingers ( K. kulolasi n. sp.); crusher with thick blunt-tipped fingers. No spot on anterior portion of palm near base of dactylus, but coloured spot at base of fixed finger ( K. jolliveti n. comb.). Adult male ambulatory legs slender, elongate, especially merus, propodus. Thoracic sternum short, wide. Male sternopleonal cavity gently concave, relatively wide distally, but without obvious depression for G1 tips. Longitudinal median line along entire male and female thoracic sternite 8, deep. G1 almost straight, obliquely directed, not crossing each other along distal parts. G2 either rather long, with the flagellum slightly longer than basal part, or shorter and with a small flagellum. Vulvae relatively large, occupying most of surface of thoracic sternite 6.

REMARK

The genera closest to Kallograea n. gen. are Austinograea Hessler & Martin, 1989 and Gandalfus McLay, 2007 , for which we deem necessary to give detailed illustrations of the species for comparisons of these two genera with the new genus established here; see below.