Classification of the genus Rugatiscala
Subg. †Opalia (Rugatiscala) de Boury 1913
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†Opalia (Rugatiscala) cowlitzensis Durham 1937
†Opalia (Rugatiscala) williamsoni Anderson and Martin 1914
†Pliciscala (Rugatiscala) levesquei de Boury 1887