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

Mya arenaria.jpg
A live individual of the soft-shelled clam, Mya arenaria
Scientific classification e
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Infraclass: Heteroconchia
Subterclass: Euheterodonta
Superorder: Imparidentia
Order: Myida
Stoliczka, 1870
Superfamilies and families

See text




They 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 familiesEdit

Superfamilies and families within the Myida include:[2]


  1. ^ Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 431. ISBN 0-03-056747-5.
  2. ^ "WoRMS - World Register of Marine Species - Myida". Retrieved 2019-04-03.

External linksEdit