Mytiloidea

Mytiloidea are a superfamily of small to large saltwater mussels, marine bivalve molluscs in the order Mytilida.

Mytiloidea
Two shells of Mytilus edulis washed up on a beach
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Order:	Mytilida
Superfamily:	Mytiloidea Rafinesque, 1815

Mytiloidea contains two families, Mysideiellidae, which is known only from fossils and Mytilidae, which has living representatives.^[1]