See text Leiorhynchus is an extinct genus of brachiopod belonging to the order Rhynchonellida and family Leiorhynchidae.

[1] Specimens have been found in South America,[2] North America, and Russia[3] in beds of middle Devonian[4] to Mississippian[3] age (372 to 325 million years old).

[5] The genus may have been adapted to dysaerobic environments, colonizing areas of reduced oxygen concentrations rich in organic matter.

[6] The genus has been used as an index fossil in North America.

This brachiopod-related article is a stub.