Cyprogenia stegaria

Fanshell, a reference photo
Photo: Dick Biggins, U.S. Fish and Wildlife Service · Public domain

The fanshell (Cyprogenia stegaria) is a species of aquatic bivalve mollusk in the family Unionidae. This clam is native to the United States, where breeding populations remain in only three rivers. It is a federally listed endangered species of the United States.

From Wikipedia, under CC BY-SA 4.0.

Is it venomous or poisonous?

We have no record of Fanshell being toxic, poisonous or venomous. That is not proof that it is safe. Never eat, touch or handle a wild plant, mushroom or animal on the strength of an identification; ask someone qualified.

Easily confused with

Classification

Kingdom
Animalia
Phylum
Mollusca
Class
Bivalvia
Order
Unionida
Family
Unionidae
Species
Cyprogenia stegaria

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Fanshell (Cyprogenia stegaria) · B.inomen