Genus: Siraius

Kingdom:Animalia
Phylum:Mollusca
Class:Gastropoda
Subclass:Opisthobranchia
Order:Nudibranchia
Suborder:Doridina
Family:Dorididae

 

Siraius sp. from Nelson Bay, Australia
(2 photos)
Siraius nucleola from Koh Bon, Thailand
(3 photos)