Raoulia calva sp. nov.

(Figs. 5G, 22, 23, 41B)

Material examined. Holotype: male (6.6 × 5.2 mm) (ZRC 2013.1721), station BMOO-08601, BIZ-138, Moorea, Society Is., Gump Reef, French Polynesia, 17.4901°S 149.8263°W, silty fringing reef wall, under rubble and rocks, 10–20 m, brushing, coll. S. McPherson, 9 November 2009. Paratype: French Polynesia: 1 female (6.5 × 5.1 mm) (ZRC 2013.1722), station BMOO-07884, BIZ-089, in front of Gump Station, near dock, Moorea, Society Is., 17.4908°S 149.8261°W, silty fringing reef wall, under silty rocks, 3–15 m, coll. S. McPherson & G. Paulay, 1 November 2009.

Diagnosis. Carapace width 1.3 times length (Fig. 22A). Junction between frontal, supraorbital margins appears almost right-angled in frontal view (Fig. 22C). Third maxilliped merus short, less than half length of ischium; ischium subquadrate, 1.3 as long as broad (Figs. 5G, 23B). Ambulatory legs short; merus of last ambulatory legs about 2.8 times as long as broad (Fig. 22A). G1 with distal half distinctly curving laterally outwards in situ, distal part dilated (Fig. 23C–F).

Colour. In life, the carapaces of the specimens are dirty white, with the pereopods light brown, and the setae reddish-brown (Fig. 41B).

Etymology. From the Latin calvus for “smooth” and “bald”, alluding to the smooth carapace and chelae, without setae and tubercles

Remarks. Raoulia calva sp. nov. shares with R. piroculata a relatively elongated ischium of the third maxilliped (length to width ratio about 1.3), but their carapaces are different, with that of R. calva sp. nov. proportionately less broad with the front margin more or less straight (Fig. 22C) while in R. piroculata, the front margin is widely triangular (Fig. 17C). Most importantly, while the G1 of R. calva sp. nov. is curved like R. limosa and R. galea sp. nov., its distal part is distinctly dilated (Fig. 23C–F) whereas it is tapering in the other taxa (Figs. 16D–G, 19H–K).

Distribution. Moorea (French Polynesia); 3– 15 m.