Classification of Raymond 1924
G. †Richardsonella Raymond 1924
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†Richardsonella belli Billings 1860
†Richardsonella cristata Billings 1860
†Richardsonella megalops Billings 1860
G. †Onchonotus Raymond 1924
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†Onchonotus globosus Billings 1860
†Onchonotus nasutus Walcott 1911
†Onchonotus richardsoni Walcott 1911