de Haan, 1833
Lateral margins of carapace distinctly convergent. Suborbital ridge in males and females heteromorphic, bearing strong knots in its middle part. Chela of chelipeds in males and females lacking a proximal patch of setae; meral stridulating ridge short, present in both males and females. Ambulatory legs 1-2 with dense setal area. Median plate of endophragmal system distinct in thoracic sternite VII, and reduced in thoracic sternites V-VI. Male abdominal segment III projecting laterally. Male first pleopod with suture running on ventromesial surface throughout, stem thick and broadened distally; horny endpiece bearing genital pore dorsally; palp thick and triangular. (Türkay 1995)
Species treated:
Chasmagnathus convexus (de Haan, 1833)