Thalassopterus

Taxobox
name = "Thalassopterus"
regnum = Animalia
phylum = Mollusca
classis = Gastropoda
subclassis = Orthogastropoda
ordo = Opisthobranchia
subordo = Gymnosomata
familia = Clionidae
genus = "Thalassopterus"
subdivision_ranks = Species
subdivision = See text.

"Thalassopterus" is a genus of swimming sea slug, a pelagic marine opisthobranch gastropod mollusk in the family Clionidae, which is one of the sea angel families in the order Thecosomata.