Classification of the genus Plesiothyreus
G. Plesiothyreus Cossmann 1888
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Subg. Plesiothyreus (Hyalorisia) Dall 1889
†Plesiothyreus ancyliformis Grateloup 1828
†Plesiothyreus parmophoroides Cossmann 1885
Classification of the genus Plesiothyreus