Raoulia calva, Ng & Rahayu, 2014

Ng, Peter K. L. & Rahayu, Dwi Listyo, 2014, Revision of the family Acidopsidae Števčić, 2005, and the systematic position of Typhlocarcinodes Alcock, 1900, Caecopilumnus Borradaile, 1902, and Raoulia Ng, 1987, with descriptions of two new genera and five new species (Crustacea: Brachyura: Goneplacoidea), Zootaxa 3773 (1), pp. 1-63 : 35

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.

Figures

FIGURE 5. Right third maxillipeds. A, Acidops cessacii (A. Milne-Edwards, 1878), syntype female (14.1 × 10.0 mm) (NHM 99.3.23.66) Cape Verde (laterally inverted); B, Parapilumnus cristimanus (A. Milne-Edwards, 1873), male (16.3 × 12.5 mm) (ZRC 2003.90), Nansha Is. (Spratly Is.), South China Sea (laterally inverted); C, Raoulia limosa Ng, 1987, holotype male (8.3 × 6.3 mm) (ZMUC M58), off Marongas, Jolo, Philippines; D, Raoulia piroculata (Rathbun, 1911), lectotype female (7.3 × 5.5 mm) (USNM 41359a), Amirante Is., Indian Ocean; E, Raoulia galea sp. nov., holotype male (9.4 × 7.4 mm) (ZRC 2000.0980), Phuket, Thailand; F, Raoulia fortis sp. nov., holotype male (12.0 × 9.2 mm) (MNHN), Santo, Vanuatu (laterally inverted); G, Raoulia calva sp. nov., holotype male (6.6 × 5.2 mm) (ZRC 2013.1721), Society Is., French Polynesia; H, Caecopilumnus hirsutus (Borradaile, 1902), male (7.1 × 5.6 mm) (ZMA 261027), Flores, Indonesia (laterally inverted); I, Caecopilumnus crassipes (Tesch, 1918), male (11.8 × 10.1 mm) (ZRC 2013.1710) Lombok, Indonesia; J, Caecopilumnus loculatus sp. nov., holotype male (8.0 × 6.7 mm) (ZRC 2013.1723), Moorea, French Polynesia (laterally inverted); K, Thecaplax capillosa gen. et. sp. nov., holotype male (11.6 × 9.5 mm) (MZB), Lombok, Indonesia; L, Typhlocarcinodes integrifrons (Miers, 1881), lectotype male (8.5 × 6.9 mm) (NHM 81.24a), Goree I., Senegal.

FIGURE 16. Raoulia limosa Ng, 1987. A–H, holotype male (8.3 × 6.3 mm) (ZMUC M58), Jolo, Philippines; I, female (9.5 × 7.3 mm) (ZRC 2013.1705), Lombok, Indonesia. A, male abdomen; B, left third maxilliped; C, frontal view of carapace showing antennules, antennae, epistome and orbit; D, E, left G1; F, G, distal part of left G1; H, left G2; I, female abdomen. Scales: A–C, I = 1.0 mm; D, E, H = 0.5 mm; F, G = 0.1 mm.

FIGURE 17. Raoulia piroculata (Rathbun, 1911), lectotype female (7.3 × 5.5 mm) (USNM 41359a), Amirante Is., Indian Ocean. A, dorsal view; B, anterior thoracic sternum and sterno-abdominal cavity; C, frontal view of carapace; D, posterior thoracic sternum; E, outer view of right chela; F, outer view of left chela.

FIGURE 19. A–E, Raoulia piroculata (Rathbun, 1911), male (11.0 × 8.5 mm), South Africa; F–L, Raoulia galea sp. nov., holotype male (9.4 × 7.4 mm) (ZRC 2000.0980), Phuket, Thailand. A, male abdomen; B, left third maxilliped; C, D, left G1; E, F, distal part of left G1; G, left G2. Scales: A, B = 1.0 mm; C, D, G = 0.5 mm; E, F = 0.1 mm. A–E after Barnard (1955: fig. 16).

FIGURE 22. Raoulia calva sp. nov., holotype male (6.6 × 5.2 mm) (ZRC 2013.1721), Society Is., French Polynesia. A, dorsal view; B, anterior thoracic sternum and sterno-abdominal cavity; C, frontal view of carapace; D, posterior thoracic sternum; E, outer view of right chela; F, outer view of left chela.

FIGURE 23. A, B, E–H, Raoulia calva sp. nov., holotype male (6.6 × 5.2 mm) (ZRC 2013.1721), Society Is., French Polynesia; H, paratype female (6.5 × 5.1 mm) (ZRC 2013.1722), Society Is., French Polynesia. A, male abdomen; B, left third maxilliped; C, D, left G1; E, F, distal part of left G1; G, left G2; H, female abdomen. Scales: A, B, H = 1.0 mm; C, D, G = 0.5 mm; E, F = 0.1 mm.

FIGURE 41. A, Raoulia fortis sp. nov., holotype male (12.0 × 9.2 mm) (MNHN), Santo, Vanuatu; B, Raoulia calva sp. nov., holotype male (6.6 × 5.2 mm) (ZRC 2013.1721), Society Is., French Polynesia [photograph A. Anker]; C, Caecopilumnus crassipes (Tesch, 1918), female specimen, Ryukyus (not examined) [photograph Y. Yamada, courtesy of T. Naruse]; D, Caecopilumnus loculatus sp. nov., holotype male (8.0 × 6.7 mm) (ZRC 2013.1723), Society Is., French Polynesia; E, Caecopilumnus loculatus sp. nov., paratype female (9.4 × 7.7 mm) (ZRC 2013.1724), Society Is., French Polynesia; F, Caecopilumnus loculatus sp. nov., paratype female (15.7 × 13.6 mm) (ZRC 2013.1725), Society Is., French Polynesia; G, Thecaplax capillosa gen. et sp. nov., one of males from paratype series, precise identity cannot be ascertained.