Portunus segnis

Carapace broad (CW/CL c. 2.2-2.3), surface evenly granular, frequently with a short pubescence between granules. Sinuous mesogastric and arched epibranchial ridges as rows of tubercles and a pair of granular elevations in cardiac region present, no other obvious ridges. Nine anterolateral teeth, 1 st acutely triangular, larger than those immediately following, 2 nd to 8 th sharp, 9 th very long, projecting laterally. Front may have four teeth except for inner supraorbital teeth, median frontal teeth usually low and obtuse or even confluent and indistinct, leaving a wide gap between spiniform lateral median teeths. Posterolateral junction of carapace rounded. Merus of third maxilliped with anterolateral corner rounded, not expanded laterally. Chelipeds relatively slender and elongate, smooth or minutely granular, merus usually with three spines on anterior border and a single terminal spine on posterodistal corner, manus with proximal and two distal spines on upper face, upper and outer face with five well-developed costae, under surface smooth, inner surface with median low and smooth costa. Ambulatory legs with merus subquadrate, posterodistal border smooth, propodus elongate, with smooth posterior border, natatorial paddle elongate oval, obtusely angled distally. Penultimate segment of male abdomen longer than broad with evenly converging lateral borders. G1 very long and slender, base with slight basal spur, curved with finely tapering tip and spinules in distal part. Female genital opening located in median part of sternite, elongate with long axis directed anteromesially, thickened cuticle along antero- and posterolateral borders (Apel and Spiridonov, 1998).