Valve refers to a shell, so a bivalve possesses two shells, which are usually hinged together and more or less cover the animal (Class Bivalvia), while univalves have only one shell, and typically leave the muscular foot exposed, unless the animal is capable of withdrawing into its shell (Class Gastropoda).
Bivalves, univalves, and cephalopods are all types of mollusks. So are gastropods.
Gastropods: snails. Gastro means something like 'stomach' or 'belly' and 'pod' means 'foot'. Cephalopods: octopusi. Cephalo means something like 'head'. Bivalves are molluscs with two clasping shells like a clam and univalves have only one.
There is no such animal as a "univalve", however "bivalves" are filter feeders and filter seawater through their gills to pick up trace amounts of food.
Some examples of univalves are snails and slugs.
Every mollusk except slugs, which have evolved to not need a shell, has a shell. Snails, clams and other bivalves have an external shell. Octopi, squid and cuttlefish have an internal shell.
gastropods include species like snails and slugs chephalopods include octopus and squid Bivalves are organisms like clams, mussles and oysters
Bivalves are a class of mollusks that have two shells hinged together, while mollusks are a diverse phylum of invertebrates that include bivalves, snails, and octopuses. Bivalves primarily feed through filter feeding by pumping water in and out of their shells, while other mollusks have various feeding methods.
Univalves, otherwise known as gastropods, live in most all oceans. A sea mollusk is a good example of a univalve.
Univalves
Bivalvia is the scientific name for the bivalves.
The edible univalves belong to the class Gastropoda. This class includes snails, slugs, and whelks, which are all mollusks with a single shell.
It has two valves, hence bi....