brother spike

{{Short description|Species of bivalve}}

{{Use dmy dates|date=September 2015}}

{{Speciesbox

| name = Brother spike

| image = Naturalis Biodiversity Center - ZMA.MOLL.419245 - Elliptio fraterna (Lea, 1852) - Unionidae - Mollusc shell.jpeg

| status = DD

| status_system = IUCN2.3

| status_ref = {{cite iucn |author=Bogan, A.E. |collaboration=Mollusc Specialist Group |date=2000 |title=Elliptio fraterna |volume=2000 |page=e.T7645A12839104 |doi=10.2305/IUCN.UK.2000.RLTS.T7645A12839104.en |access-date=16 November 2021}}

| genus = Elliptio

| species = fraterna

| authority = (I. Lea, 1852)

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