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What is "trigonia"

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trigonia
The Collaborative International Dictionary
Trigonia

Trigonia \Tri*go"ni*a\, n. [NL. See Trigon. So called in allusion to the triangular shape of some species.] (Zo["o]l.) 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.

Wikipedia
Trigonia

Trigonia is an extinct genus of saltwater clams, fossil marine bivalve mollusk in the family Trigoniidae.

Usage examples of "trigonia".

For instance, a single species of Trigonia, a great genus of shells in the secondary formations, survives in the Australian seas.