New records of ‘opisthobranchs’ (Gastropoda: Heterobranchia) from Arrecife Alacranes National Park, Yucatan, Mexico

Abstract

We report 37 species of heterobranch sea slugs from the National Park Alacranes reef, located in the Campeche Bank, at the south-eastern Gulf of Mexico, of which 18 species are reported for the first time in this reef. With this contribution, the species richness in this national park increases to up to 67. The speciesNakamigawaia felis, Petaliferasp.,Elysia flava, Elysia pratensisandBulbaeolidiasp. are reported in the Gulf of Mexico for the first time. The geographical distribution ranges forOxynoe azuropunctata, Elysia ornata, Placida kingstoni, Aphelodoris antillensisandTritonia hamnerorumare extended westward. Those forElysia flava, Pleurobranchus areolatusandFelimare ruthaeare extended both northward and westward.