Trigonia is an extinct genus of saltwater clams, fossil marine bivalve mollusk in the family Trigoniidae. The genus Trigonia is the most readily identifiable member of the familyTrigoniidae, having a series of strong ribs or costae along the anterior part of the shell exterior. They are the first representatives of the family to appear in the Midd...
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• (n.) A genus of pearly bivalve shells, numerous extinct species of which are characteristic of the Mesozoic rocks. A few living species exist on the coast of Australia.
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http://thinkexist.com/dictionary/meaning/trigonia/
genus of mollusks that first appeared during the Jurassic period, which began about 208 million years ago. The still-extant Trigonia has a ...
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http://www.britannica.com/eb/a-z/t/80
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