de Haan, 1833
Carapace more or less circular or transversely ovate. Often a postero-lateral vault-like expansion over the ambulatory legs. Antennules folding obliquely or nearly vertically. Antennae generally small. Third maxilliped not elongate or acute, not completely closing the buccal cavern and not concealing the palp in repose; exopodite broad. Afferent branchial openings having the normal position in front of the bases of third maxilliped. Efferent branchial channels together forming a deep channel in the endostome, covered by a pair of lamellar process from the first maxillipeds. Chelipeds practically symmetrical in size but characterized by a strong heterodonty; chela of a great size and so curved as to shut closely against the pterygostomial region. Male abdomen with some segments fused. Female openings sternal. Male openings coxal. G2 long and narrow, exceeding the length of G1. (Guinot 1998)
Genera treated:
genus Calappa Weber, 1795
genus Cycloes de Haan, 1837
genus Mursia Desmarest, 1823
genus Paracyclois Miers, 1886