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Mya arenaria.jpg
A live individual of the soft-shelled clam, Mya arenaria
Scientific classification e
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Subclass: Heterodonta
Order: Myoida
Stoliczka, 1870
Superfamilies and Families

See text

Myoida is an order of saltwater clams, marine bivalve molluscs in the subclass Heterodonta. The order includes such bivalves as soft-shell clams, geoducks, and shipworms.


These are burrowing molluscs, with well-developed siphons. The shell is relatively soft, and lacks a nacreous layer. Some species have a single cardinal tooth.[1]

Superfamilies and families[edit]

Superfamilies and families within the Myoida include:


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

External links[edit]