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Myida 
Summary
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.
| 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 | |
Description edit
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 edit
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 edit
- Powell A W B, New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1
External links edit
- Animaldiversity
- Taxonomicon