Myida

Myida
A live individual of the soft-shelled clam, Mya arenaria
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Infraclass:	Heteroconchia
Subterclass:	Euheterodonta
Superorder:	Imparidentia
Order:	Myida Stoliczka, 1870
Superfamilies and families
See text
Synonyms
Myoida

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.

Description

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 families

Superfamilies and families within the Myida include:^[2]

• Superfamily: Dreissenoidea
  • Family: Dreissenidae
• Superfamily: Myoidea
  • Family: Corbulidae
  • Family: Myidae
  • Family: †Pleurodesmatidae
  • Family: †Raetomyidae
• Superfamily: Pholadoidea
  • Family: Pholadidae
  • Family: Teredinidae
  • Family: Xylophagaidae
• Superfamily: †Pleuromyoidea
  • Family: †Ceratomyidae
  • Family: †Pleuromyidae
  • Family: †Vacunellidae

References

• Powell A W B, New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1

External links

• Animaldiversity
• Taxonomicon