# Mytilida

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Order of bivalves

Mytilida Three shells of Perna viridis Scientific classification Kingdom: Animalia Phylum: Mollusca Class: Bivalvia Subclass: Pteriomorphia Order: Mytilida Superfamilies †Modiolopsoidea Mytiloidea Synonyms Mytiloida

**Mytilida** is an order of [marine](/source/Marine_(ocean)) [bivalve](/source/Bivalve) [molluscs](/source/Mollusc), commonly known as **true mussels**.[1] There is one extant superfamily, the [Mytiloidea](/source/Mytiloidea), with a single extant family, the [Mytilidae](/source/Mytilidae).

Species in the order Mytilida are found worldwide, but they are more abundant in colder seas, where they often form uninterrupted beds on rocky shores in the [intertidal zone](/source/Intertidal_zone) and the shallow subtidal. The subfamily Bathymodiolinae is found in [deep-sea](/source/Deep-sea) habitats.

Mytilids include the well-known edible sea mussels.

A common feature of the shells of mussels is an asymmetrical shell that has a thick, adherent [periostracum](/source/Periostracum). The animals attach themselves to a solid substrate using a [byssus](/source/Byssus).

## 2010 taxonomy

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

- Superfamily †[Modiolopsoidea](https://en.wikipedia.org/w/index.php?title=Modiolopsoidea&action=edit&redlink=1) - Family †[Colpomyidae](https://en.wikipedia.org/w/index.php?title=Colpomyidae&action=edit&redlink=1) - Family †[Modiolopsidae](https://en.wikipedia.org/w/index.php?title=Modiolopsidae&action=edit&redlink=1) - Family †[Saffordiidae](https://en.wikipedia.org/w/index.php?title=Saffordiidae&action=edit&redlink=1)

- Superfamily [Mytiloidea](/source/Mytiloidea) - Family †[Mysideiellidae](https://en.wikipedia.org/w/index.php?title=Mysideiellidae&action=edit&redlink=1) - Family [Mytilidae](/source/Mytilidae)

## References

1. **[^](#cite_ref-1)** [*Mytilida* Ferussac, 1822](http://www.marinespecies.org/aphia.php?p=taxdetails&id=210). Retrieved through: [World Register of Marine Species](/source/World_Register_of_Marine_Species) on 9 July 2010.

1. **[^](#cite_ref-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

Taxon identifiers Mytilida Wikidata: Q26869649 Wikispecies: Mytilida ADW: Mytilida AFD: Mytilida BOLD: 765885 CoL: 8ZXHG GBIF: 9330464 NCBI: 6546 Open Tree of Life: 1025542 WoRMS: 210 Mytiloida Wikidata: Q1440794 BOLD: 137 EoL: 2234 GBIF: 995 iNaturalist: 50599 IRMNG: 10483 ITIS: 79450 NBN: NHMSYS0021055066 NZOR: 43f0c281-29bf-47ef-b89d-316cd9717616 Paleobiology Database: 243990

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