Clio (gastropod)

Clio
	Clio recurva (specimen at the Smithsonian Institution)
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Clade:	Euopisthobranchia
Order:	Pteropoda
Suborder:	Euthecosomata
Superfamily:	Cavolinioidea
Family:	Cliidae
Genus:	Clio; Linnaeus, 1767
Type species
	Clio pyramidata; Linnaeus, 1767
Synonyms
	Balantium Children, 1823; † Balantium (Flabellulum) Bellardi, 1873; † Balantium (Poculina) Bellardi, 1873 (invalid: junior homonym of...); † Chaduma Korobkov, 1966; Cleodora Peron & Lesueur, 1810; Clio (Balantium) Children, 1823; Clio (Bellardiclio) A.W. Janssen, 2004; Clio (Clio) Linnaeus, 1767 · alternate representation; † Clio (Nudiclio) Korobkov, 1966; Euclio Bonnevie, 1913 · unaccepted; Hyalaea (Cleodora) F. Péron & Lesueur, 1810 junior objective synonym; Proclio Hubendick, 1951;

The genus Clio is a taxonomic group of small floating sea snails, commonly called sea butterflies. These animals are pelagic marine opisthobranch gastropod mollusks, and the sole genus belonging to the family Cliidae.

All species within this genus exhibit a bilaterally symmetrical shell that is either straight or slightly curved dorso-ventrally towards the apex. The shell cross-section is elliptical to triangular. The protoconch is distinct and globular or elliptical, often bearing a spine at its tip.