Arcoida
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| Arcoida Temporal range: Lower Ordovician–Recent |
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| Anadara from the Pliocene of Cyprus. | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Subclass: | Pteriomorpha |
| Order: | Arcoida |
| Families | |
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7, See text. |
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The Arcoida is an extant order of bivalve molluscs.[1] This order dates back to the lower Ordovician period. They are distinguished from related groups, such as the mussels, by having a straight hinge to the shells, and the adductor muscles being of equal size.[2]
Seven families are currently recognised within the order, including the well-known ark clams or ark shells in the family Arcidae.
[edit] 2010 Taxonomy of the Arcoida
In 2010 a new proposed classification system for the Bivalvia was published in by Bieler, Carter & Coan revising the classification of the Bivalvia, including the order Arcoida.[3]
Order Arcoida
- Superfamily Arcoidea
- Superfamily Limopsoidea
[edit] References
- ^ Arcoida Stoliczka, 1871. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=207 on 3 February 2009.
- ^ Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 430. ISBN 0-03-056747-5.
- ^ 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
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