Arcoida

Taxobox
name = Arcoida
fossil_range = Lower Ordovician to Recent


image_caption = "Arca zebra" shell
regnum = Animalia
phylum = Mollusca
classis = Bivalvia
subclassis = Pteriomorpha
ordo = Arcoida
subdivision_ranks = Families
subdivision = See text.

The Arcoida is an extant order of clams or bivalve molluscs. This order dates back to the lower Ordovician period.

Seven families are currently recognised within the order, including the well-known ark clams or ark shells in the family Arcidae.

uperfamilies and families in the order Arcoida

* Superfamily Arcoidea
** Arcidae
** Cucullaeidae
** Noetiidae
** Parallelodontidae
* Superfamily Limopsoidea
** Glycymerididae
** Limopsidae
** Philobryidae

References