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Perna viridis 001.jpg
Three shells of Perna viridis
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Subclass: Pteriomorphia
Order: Mytiloida

Mytiloida is an order of marine bivalve mollusks, commonly known as true mussels.[1] There is one extant superfamily, the Mytiloidea, with a single family, the Mytilidae.

Species in the order Mytiloida are found worldwide, but they are more abundant in colder seas, where they often form uninterrupted beds on rocky shores in the intertidal zone and the shallow subtidal. The subfamily Bathymodiolinae is found in deep-sea habitats.

Mytilids include the well-known edible sea mussels.

A common feature of the shells of mussels is an asymmetrical shell which has a thick, adherent periostracum. The animals attach themselves to a solid substrate using a byssus.

2010 taxonomy[edit]

In 2010, a new proposed classification system for the Bivalvia was published by Bieler, Carter & Coan. This included the suborder Mytiloida.[2]


  1. ^ Mytiloida Ferussac, 1822.  Retrieved through: World Register of Marine Species on 9 July 2010.
  2. ^ 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