| Heterodonta | ||||||||
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 New Zealand cockles
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†Cycloconchidae |
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:
- Order †Cycloconchidae
- Order †Hippuritoida (rudists)
- Order †Lyrodesmatidae
- Order Myoida (soft-shell clams and allies)
- Order †Redoniidae
- Order Veneroida (cockles and allies)
References
- ^ Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 340. ISBN 0-03-056747-5.
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