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]

References

1. Bieler, R., Carter, J.G. & Coan, E.V. (2010) Classification of Bivalve families. Pp. 113-133, in: Bouchet, P. & Rocroi, J.P. (2010), Nomenclator of Bivalve Families. Malacologia 52(2): 1-184