# Anomalodesmata

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**Anomalodesmata** is an [superorder](/source/Superorder_(biology)) of saltwater clams, [marine](/source/Marine_(ocean)) [bivalve](/source/Bivalve) [molluscs](/source/Molluscs).[1] This grouping was formerly recognised as a taxonomic [subclass](/source/Subclass_(biology)). It is called a superorder in the current [World Register of Marine Species](/source/World_Register_of_Marine_Species), despite having no orders, to parallel it with sister taxon [Imparidentia](/source/Imparidentia), which does have orders.[2]

## Description

The [shells](/source/Bivalve_shell) of species in this order are of equal size, as are the muscles that hold them closed, and the margins at the hinges are thickened. The margins of the [mantle](/source/Mantle_(mollusc)) are also fused, and there is only a single [hinge tooth](/source/Hinge_tooth), if any.[3]

## Families

In 2010, a new proposed classification system for the Bivalvia was published in *[Malacologia](/source/Malacologia)* by Bieler, Carter & Coan revising the classification of the Bivalvia, including the order Anomalodesmata.[4] The following tree is their info which has been updated with the latest information from the [World Register of Marine Species](/source/World_Register_of_Marine_Species):

The use of † indicates taxa that are extinct.

**Order: Anomalodesmata**

- Superfamily: [Clavagelloidea](/source/Clavagelloidea) - Family: [Clavagellidae](/source/Clavagellidae) - Family: [Penicillidae](/source/Penicillidae)
- Superfamily: [Cuspidarioidea](/source/Cuspidarioidea) - Family: [Cuspidariidae](/source/Cuspidariidae) - Family: [Halonymphidae](/source/Halonymphidae) - Family: [Protocuspidariidae](/source/Protocuspidariidae) - Family: [Spheniopsidae](/source/Spheniopsidae)
- Superfamily: [Myochamoidea](/source/Myochamoidea) - Family: [Cleidothaeridae](/source/Cleidothaeridae) - Family: [Myochamidae](/source/Myochamidae)
- Superfamily: [Pandoroidea](/source/Pandoroidea) - Family: [Lyonsiidae](/source/Lyonsiidae) - Family: [Pandoridae](/source/Pandoridae)
- Superfamily: [Pholadomyoidea](/source/Pholadomyoidea) - Family: †[Arenigomyidae](/source/Arenigomyidae) - Family: †[Margaritariidae](/source/Margaritariidae) - Family: [Parilimyidae](/source/Parilimyidae) - Family: [Pholadomyidae](/source/Pholadomyidae) - Family: †[Ucumariidae](/source/Ucumariidae)
- Superfamily: [Poromyoidea](/source/Poromyoidea) - Family: [Cetoconchidae](/source/Cetoconchidae) - Family: [Poromyidae](/source/Poromyidae)
- Superfamily: [Thracioidea](/source/Thracioidea) - Family: †[Burmesiidae](/source/Burmesiidae) - Family: [Clistoconchidae](/source/Clistoconchidae) - Family: [Laternulidae](/source/Laternulidae) - Family: [Periplomatidae](/source/Periplomatidae) - Family: [Thraciidae](/source/Thraciidae)
- Superfamily: [Verticordioidea](/source/Verticordioidea) - Family: [Euciroidae](/source/Euciroidae) - Family: [Lyonsiellidae](/source/Lyonsiellidae) - Family: [Verticordiidae](/source/Verticordiidae)

## References

1. Barnes, Robert D. (1982). *Invertebrate Zoology*. Philadelphia, PA: Holt-Saunders International. p. 431. ISBN 0-03-056747-5.

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

- [Powell A W B](/source/Arthur_William_Baden_Powell), *New Zealand Mollusca*, [William Collins Publishers Ltd](/source/HarperCollins), Auckland, New Zealand 1979 ISBN 0-00-216906-1

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