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Orthida
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Orthida

fossil lamp shell order

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taxonomy of Brachiopoda

  • lamp shells
    In lamp shells: Annotated classification

    Order OrthidaUsually biconvex, wide-hinged, with interareas in both valves; teeth deltidiodont (leave a growth path along margin of pedicle opening); hinge structures consist of brachiophores (supporting structures), shell substance punctate or impunctate—i.e., with or without pits; more than 200 genera; Early Cambrian through Permian.Order…

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