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| Palaeoheterodonta Temporal range:
| |
|---|---|
| |
| Anodonta anatina | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Subclass: | Autobranchia |
| Infraclass: | Heteroconchia |
| Subterclass: | Palaeoheterodonta Newell, 1965 |
| Orders | |
Palaeoheterodonta is a subterclass of bivalve molluscs.[1][2] It contains the extant orders Unionida (freshwater mussels) and Trigoniida. They are distinguished by having the two halves of the shell be of equal size and shape, but by having the hinge teeth be in a single row, rather than separated into two groups, as they are in the clams and cockles.[3]
- ^ Palaeoheterodonta Newell, 1965. Retrieved through: World Register of Marine Species on 9 July 2010.
- ^ "Molluscabase - Palaeoheterodonta". www.molluscabase.org. Retrieved 2023-08-11.
- ^ Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 340. ISBN 0-03-056747-5.