(Science: zoology) A shell consisting of one valve only; a mollusk whose shell is composed of a single piece, as the snails and conchs. most univalves are spiral and are the shells of gastropods, but many belong to cephalopods and pteropods.

What type of univalve has no shell?

Octopuses and squids are animals with no outside shells.

Whats the difference between a univalve and bivalve?

As nouns the difference between univalve and bivalve

is that univalve is a univalve mollusk or its shell while bivalve is any mollusc belonging to the taxonomic class bivalvia, characterized by a shell consisting of two hinged sections, such as a scallop, clam, mussel or oyster.