Samouelle, 1819
Epistome reduced or absent. The efferent branchial channels terminate in the middle of the buccal area, the buccal cavern is therefore produced forwards and is generally of an elongate triangular shape; and the efferent channels themselves, whether covered by third maxillipeds or not, are immediately closed in by an elongate lamellar process of the exopodites of first maxillipeds. The afferent branchial openings are found either in the usual place in front of the bases of the chelipeds, or at the sides of the endostome. Branchiae from six to nine on either side. The antennulae fold either longitudinally or obliquely, very rarely transversely. In the male the genital ducts protrude either through the bases of P5 or through the fifth thoracic sternum closeby. (Alcock, 1896: 135, inclusive of Calappidae; Leucosiidae; Dorippidae; Raninidae).
Families treated:
family Calappidae de Haan, 1833
family Leucosiidae Samouelle, 1819
family Matutidae de Haan, 1835