Species (3)

• 

  Metazoa Mollusca Bivalvia Unionoida Unionidae Orthonymus

  Orthonymus metanevrus Rafinesque

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• 

  Metazoa Mollusca Bivalvia Unionoida Unionidae Orthonymus

  Orthonymus cylindricus Say

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  Metazoa Mollusca Bivalvia Unionoida Unionidae Orthonymus

  Orthonymus cylindricus Wright B.H. ssp. strigillatus

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