This mentioned taxonomy is an attempt to make an conclusive assignment from the different classifications of various scientists. Because the taxonomy may change due to the latest investigative methods and other findings, our map is a guide only.
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H. J. Howe, 1979 - Middle and Late Ordovician plectambonitacean, rhynchonellacean, syntrophiacean, trimerellacean, and atrypacean brachiopods: descriptions and illustrations of 14 species of Ordovician brachiopods - United States Geological Survey Professional Paper (1066), C1-C17 (serial monograph, English)
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C. D. Walcott, 1890 - Descriptive notes of new genera and species from the Lower Cambrian or Olenellus zone of North America - Proceedings of the United States National Museum (12), 33-46 (journal article, English)
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