New data on the benthic Opisthobranch Molluscs from the Archipelago of Fernando de Noronha (Brazil), with description of a new species of Aegires Lovén, 1844

New data on the opisthobranch fauna from the Archipelago Fernando de Noronha are presented in this paper, 111 specimens distributed among 12 species were studied and 11 of them are a new record for the archipelago. A new species of genus Aegires is described. The external anatomy and radula of this specimen are compared with other species of the genus.