The clade Anaspidea, commonly known as sea hares, are medium-sized to very large opisthobranch gastropod molluscs with a soft internal shell made of protein. These are marine gastropod molluscs in the superfamilies Aplysioidea and Akeroidea.
Anaspidea
Sea Hare Dolabella auricularia at Big Island of Hawaii
Sea hare Aplysia dactylomela
Aplysia dactylomela showing mouth
Aplysia is a genus of medium-sized to extremely large sea slugs, specifically sea hares, which are a kind of marine gastropod mollusk.
Aplysia
Aplysia egg mass
An Aplysia fasciata (above) and a couple of Aplysia punctata (below) grazing in a tide pool in Póvoa de Varzim, Portugal.