Abstract
one of the three extinct classes of brachiopods in the subphylum Rhynchonelliformea; a small class formerly labeled inarticulate but now considered primitively articulate; early to middle Cambrian.
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Carlton, R.L. (2018). O. In: A Concise Dictionary of Paleontology. Springer, Cham. https://doi.org/10.1007/978-3-319-73055-4_15
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DOI: https://doi.org/10.1007/978-3-319-73055-4_15
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