Classification of the genus Sigmocheilus

G. †Sigmocheilus Palmer 1960
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†Sigmocheilus compressus Palmer 1968
†Sigmocheilus delicatus Lazarenko 1968
†Sigmocheilus flabellifer Hall and Whitfield 1877
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Invalid names: Sigmocheilus serratus Palmer 1960 [synonym]
†Sigmocheilus grata Resser 1942