Mesotheres barbatus (Desbonne, 1867)

Ng, Peter K. L., Ahyong, Shane T. & Campos, Ernesto, 2019, Two new genera of pinnotherid crabs (Crustacea: Brachyura: Pinnotheroidea) from the Americas and the Western Pacific, Raffles Bulletin of Zoology 67, pp. 337-351 : 345

Mesotheres barbatus (Desbonne, in Desbonne & Schramm, 1867) new combination

( Figs. 7 , 8 )

Pinnotheres barbata Desbonne , in Desbonne & Schramm, 1867: 44.

Pinnotheres barbatus — Rathbun, 1918: 88, text-fig. 44, pl. 19, figs. 8–11; Rathbun, 1933: 82; Schmitt et al., 1973: 39; Manning & Holthuis, 1981: 183; Gore, 1986: 147, table 1.

Orthotheres barbatus — Sakai, 1969: 244; Campos, 1989: 1124; Ng et al., 2008: 250; Palacios-Theil et al., 2009: 449; Palacios Theil et al., 2016: 5.

Material examined. USNM 102159 , 1 female (9.7 × 7.7 mm), zoeas and megalopa, Los Roques Islands , Venezuela, Caribbean Sea, coll. J. Bolaños, 18 December 2000 .

Diagnosis. Carapace glabrous, convex in all directions. Margin of carapace front, under surface of carapace, pleon, margins of chelipeds and P2–P5 strongly hirsute (except dactyli). Eyes and front not visible in dorsal view; front distinctly deflexed, defined by convex median projection in frontal view. P1–P5 similar, broad, compressed; P5 not prominently shorter, narrower than other legs.

Remarks. The larval development of A. barbatus , described by Bolanõs et al. (2005), is abbreviated, with only two zoeal stages (usually three or more in other pinnotherines) preceding the megalopa (see also Galindo et al., 2003).

Figures

Fig. 7. Mesotheres barbatus (Desbonne, in Desbonne & Schramm, 1867) new combination, female (9.7 × 7.7 mm) (USNM 102159), Venezuela. A, overall dorsal habitus; B, frontal view of cephalothorax; C, ventral view of cephalothorax.

Fig. 8. Mesotheres barbatus (Desbonne, in Desbonne & Schramm, 1867) new combination, female (9.7 × 7.7 mm) (USNM 102159), Venezuela. A, outer view of right MXP3; B, inner view of right MXP3. Scales = 0.5 mm.