On Petalifera petalifera (Rang, 1828) (Gastropoda: Opisthobranchia): New anatomical and geographical data

Abstract

The anaspidean gastropod Peialifera petalifera (Rang, 1828) is a common species in Mediterranean waters, where it was originally described from Nice, although it has a wider geographical range, living in both East and West Atlantic warm waters. A detailed anatomical description of this species is given, using the scanning electron microscope to study the radula, jaws and palatai rods as well as the inner structure of the penial sheath. Examination of the type material of the Red Sea species Aplysiella gravieri Vayssière, 1906 indicates that it is a synonym of Petalifera petalifera (Rang, 1828). Thus the geographical range of the latter is extended to the Gulf of Aden, in the Red Sea.