Heterodonta is a taxonomic subclass of saltwater clams, marine bivalve molluscs. This subclass includes the edible clams, the cockles and the Venus clams. These bivalves are distinguished by having the two halves of the shell equally sized (i.e, they are equivalved), and having a few cardinal teeth separated from a number of long lateral teeth. Th...
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http://en.wikipedia.org/wiki/Heterodonta
(from the article `bivalve`) ...functioning as an incubatory marsupium; ovoviviparous; parasitically larviparous; freshwater; some cemented and oysterlike; mostly ... Of the various subclasses, two are most important ecologically: the Heterodonta, which are modern burrowers that feed primarily on suspended ... [2 related articles]
Found on
http://www.britannica.com/eb/a-z/h/44
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