Torbenia calvata, Macpherson, 2006

Macpherson, Enrique, 2006, New species and new occurrence of Galatheoidea (Crustacea, Decapoda) from New Caledonia, Zoosystema 28 (3), pp. 669-681 : 678

Torbenia calvata n. sp.

( Fig. 4 )

HOLOTYPE. — New Caledonia. NORFOLK 2, stn 2055, 23°39.23’S, 168°16.43’E, 900-950 m, 24.X.2003, 1 ovig. ♀ 4.5 mm (MNHN-Ga 4626).

PARATYPE. — New Caledonia. CHALCAL 2, stn 69, 24°43.70’S, 168°07.90’E, 260 m, 27.X.1986, 1 ♂ 4.3 mm.

ETYMOLOGY. — From the Latin, calvatus, made bare, in reference to the absence of spines on the anterior ridge of the second abdominal segment.

DISTRIBUTION. — New Caledonia, between 260 and 950 m.

DESCRIPTION

Carapace slightly longer than wide. Transverse ridges usually interrupted, except several on gastric region and posterior part of carapace, with few very short, non-iridescent setae. Main transverse striae on posterior part of carapace interrupted in cardiac region. Scales and secondary striae between main striae absent. Gastric region with two main epigastric spines, behind supraocular spines; two or three additional minute spines on each side. One to three small parahepatic spines on each side (male), one small anterobranchial and one postcervical spine on each side. Orbit with mesial, rounded mound, lateral limit slightly defined. Frontal margins concave. Lateral margins slightly convex. Anterolateral spine short, at anterolateral angle, clearly not reaching level of sinus between rostrum and supraocular spines. Second marginal spine anterior to cervical groove very small. Branchial margins with four small spines. Rostrum spiniform, less than half as long as remaining carapace, slightly carinated dorsally, straight, and slightly upwards directed. Supraocular spines reaching mid-length of rostrum and clearly not overreaching end of corneae, subparallel, directed slightly upwards ( Fig. 4A ).

Figures

FIG. 4. — Torbenia calvata n. sp., holotype,ovigerous ♀ 4.5 mm: A, carapace and abdomen, dorsal view; B, sternal plastron; C, ventral view of cephalic region, showing antennular and antennal peduncles; D, right third maxilliped, lateral view; E, right cheliped, dorsal view;F, left first walking leg, lateral view; G, dactylus of left first walking leg,lateral view.Setae of carapace, abdomen and pereiopods not illustrated. Scale bars: A, E, F, 2 mm; B-D, G, 1 mm.