A new species and new records of 'Oncinopus' (Crustacea: Brachyura: Inachidae) from Northern Australia

Abstract

A new species of the Indo-west Pacific majoid spider crab genus Oncinopus is described from Darwin Harbour (Northern Territory), as well as the North West Shelf (Western Australia) and the Gulf of Carpentaria (Queensland). It can be distinguished from other species by differences in the morphology of the male first gonopod, rostral shape, the setation of the dactyl of the first pereiopod, and the length of the last two pairs of pereiopods. Oncinopus angustifrons Takeda and Miyake, 1969 is recorded from the North West Shelf, and is the first record of this species from Australia. Oncinopus aranea (De Haan, 1839) is recorded from northwestern Australia for the first time. Five species of Oncinopus are now recognised, with four of these now known from Australia. A key to distinguish them is provided.