Catinia rosea n. sp. (Copepoda, Catiniidae) associated with Sipunculus phalloides (Pallas) from São Sebastião Channel, Brazil

A new species of Catinia Bocquet and Stock was found attached to the surface of Sipunculus phalloides (Pallas), living in the intertidal zone of Ponta do Araca, State of Sao Paulo, Brazil. The new species differs from the other two species known, C. plana and C. aiso, because it has a smoother posterior contour (without strong indentations or crenulations), the process of the first segment of the antennule is a triangular serrate lamella mounted on a cylindrical pedestal, and there are minute suckers or sucker-like setae in the antenna and maxilla besides the main sucker of the antenna.