Five species are currently recognized as valid: Monotherium aberratum, M. affine, M. delognii, M. rousseaui, and M. wymanii. The first four are known for Tortonian-age deposits from Belgium, while M. wymanii is known from the Calvert Formation of Virginia.
- P. J. Van Beneden. 1876. Les phoques fossiles du bassin d'Anvers. Bulletins de l'Academie Royale des Sciences, des Lettres et des Beaux-Arts de Belgique 41:783-803
- J. Leidy. 1854. The ancient fauna of Nebraska 1-126
- C. E. Ray. 1976. Phoca wymani and other Tertiary seals (Mammalia: Phocidae) described from the eastern seaboard of North America. Smithsonian Contributions to Paleobiology 28:1-33
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