Izucaris masudai, new genus, new species (Decapoda : Caridea : Palaemonidae), a sea anemone associate from Japan

A new genus is proposed for Izucaris masudai, new species, a pontoniid shri mp associated with the sea anemone Nemanthus nitidus. Izucaris, new genus, is closely related to the genus Pontonides sensu stricto, but distinguished by the rostrum overreaching the midlength level of the distal peduncular a rticle of the antennule, the pterygostomian margin distinctly tapering ante riorly, and the lack of a distinct protrusion on the medial margin of the d actyl of the second maxilliped. The type species is described and illustrat ed based on a male and a female collected from Izu Peninsula, Honshu, Japan . The color pattern of the new species may show a chromatic adaptation.