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 siphonss. The shell is relatively soft and lacks a nacreous layer. Some species have a single cardinal tooth.

Superfamilies and families

Superfamilies and families within the Myida include (the use of † indicate taxa that are extinct):

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

External links

• Animaldiversity

• Taxonomicon