Classification of the genus Orthidium
G. †Orthidium Hall and Clarke 1892
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†Orthidium barnesi Ross 1970
†Orthidium bellulum Ulrich and Cooper 1938
†Orthidium gemmiculum Billings 1865
†Orthidium lamellosa Raymond 1905
†Orthidium lamellosum Raymond 1905
†Orthidium prominens Benedetto et al. 2003