Elliptio fraternum The brother spike (Elliptio fraterna) is a species of freshwater mussel the family Unionidae, the river mussels.

This species is endemic to the Savannah River, United States.

[1] It listed as "endangered "in 1996 and was changed due to insufficient information and it has a world listing of "critically imperilled/imperilled".

[2] This Unionidae-related article is a stub.

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