Pteriomorphia

The Pteriomorphia comprise a subclass of saltwater clams, marine bivalve mollusks. It contains several major orders, including the Arcoida, Ostreoida, Pectinoida, Limoida, Mytiloida, and Pterioida. It also contains some extinct and probably basal families, such as the Evyanidae, Colpomyidae, Bakevelliidae, Cassianellidae, and Lithiotidae. This sub...
Found on http://en.wikipedia.org/wiki/Pteriomorphia

Pteriomorphia

(from the article `bivalve`) ...represented today by the superfamily Trigonioidea (placed in the subclass Palaeoheterodonta), which are an aberrant group of the subclass ... Of the various subclasses, two are most important ecologically: the Heterodonta, which are modern burrowers that feed primarily on suspended ... ...sulfur-oxidiz...
Found on http://www.britannica.com/eb/a-z/p/128
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