| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Subclass: | Heterodonta |
†Cycloconchidae
†Hippuritoida
†Lyrodesmatidae
Myoida
†Redoniidae
Veneroida
Heterodonta is a subclass of bivalve molluscs, including the clams and cockles. They are distinguished by having the two halves of the shell be equally sized, and having a few cardinal teeth separated from a number of long lateral teeth. Their shells lack a nacreous layer, and the gills are lamellibranch in form. Most species have a siphon.[1]
The subclass contains two living and four extinct orders:
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