Latohexapus granosus Huang, Hsueh & Ng, 2002

Rahayu, Dwi Listyo & Ng, Peter K. L., 2014, New genera and new species of Hexapodidae (Crustacea, Brachyura) from the Indo-West Pacific and east Atlantic, Raffles Bulletin of Zoology 62, pp. 396-483 : 464

Latohexapus granosus Huang, Hsueh & Ng, 2002

( Fig. 54 )

Latohexapus granosus Huang et al., 2002: 656 , figs. 1B, 3, 4; Ng et al., 2008: 86.

Material examined. Holotype: male (16.3 × 8.2 mm) ( ZRC 2002.001 ), port at Bertzuliau , Yulin County, Taiwan, coll. P.-Y. Hsu, 23 March 2000.

Diagnosis. Carapace about 1.9 times as broad as long, dorsal surface distinctly granulated; regions separated by deep grooves; anterolateral margin arcuate; posterolateral corner with small angle over base of posterior pereopods ( Fig. 54A ). Orbit distinct, transverse; eye movable ( Fig. 54A, B ). Pterygostomial region with row of oblique striae ( Fig. 54B ). Third maxillipeds broad, completely covering buccal cavity; exopod with well developed flagellum ( Fig. 54B, C ). Chelipeds asymmetrical; major chela with wide gap when fingers closed, granulated ( Fig. 54C ); minor chela with narrower gap when fingers closed; ornamentation similar to that of major chela. P2–P4 relatively short; P3 longest, surfaces granulated; deep longitudinal groove on lateral face of merus of P4 ( Fig. 54A ). Male thoracic sternum very broad ( Fig. 54C ); sternites 1, 2 fused, strongly bent inwards towards buccal cavity; thoracic sternal groove extending obliquely from edge of abdominal cavity, bending to become subparallel to frontal margin to base of chelipeds; sternoabdominal cavity reaching base of sternite 3; sternite 8 exposed, triangular, as long as abdominal somite 1. Male abdomen relatively narrow ( Fig. 54C ), surface granular; somites 3–5 fused, lateral margin sinuous; somite 6 with median part of lateral margin prominently expanded into triangular projection, appearing evenly hexagonal; telson rounded. G1 slender, bent submedially, directed anterolaterally, distal part tapered, not concealed under abdomen.

Colour. In life, the carapace and appendages are dirty white overall, but stained black in many parts by the mud.

Remarks. Huang et al. (2002) gave a relatively complete description and figures of the genus and species, and there is no need to repeat it. One useful character not used by Huang et al. (2002) is the form of thoracic sternites 1 and 2. Latohexapus is the only genus known to have thoracic sternites 1 and 2 sharply bent inwards and downwards into the buccal cavity ( Fig. 54B, C ).

Type locality. Bertzuliau , Yulin County, Taiwan .

Distribution. Yulin County, Taiwan. Subtidal.

Figures

Fig. 54. Latohexapus granosus Huang, Hsueh & Ng, 2002, holotype male (16.3 × 8.2 mm) (ZRC 2002.001). A, overall view of carapace, chelipeds and P2–P4; B, frontal view of cephalothorax; C, ventral view of cephalothorax.