Pyganodon lacustris

Lake Floater, a reference photo
Photo: Lea, 1857 · CC0 (licence)

Pyganodon lacustris is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels. It is endemic to the United States, where it is known to occur in Illinois, Ohio, Michigan, New York, Indiana and Wisconsin. It may also occur in the Great Lakes and into Canada, however its full range has not been fully assessed. It is commonly called the lake floater.

From Wikipedia, under CC BY-SA 4.0.

Is it venomous or poisonous?

We have no record of Lake Floater 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
Pyganodon lacustris

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