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...1988, The Conodonta: morphology, taxonomy, paleoecology, and evolutionary history of a long-extinct animal phylum: Oxford University Press Monographs on Geol Individual conodonts vary greatly in morphology, and taxonomy was originally based on the morphology of these individual specimens. While

...in northeastern Utah, and its trilobite faunas: Peabody Museum of Natural History Bulletin, v. 6, 161 p.</ref> <ref name=Hintze_1953>Hintze, L. F., 1953, Low ...Ehmaniella Biozone (Middle Cambrian): Los Angeles County Museum of Natural History, Contributions in Science 446, 137 p.</ref> <ref name=Sundberg_2005>Sundber