Classification of the genus Protorthis

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Subg. †Protorthis (Loperia) Walcott 1905
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†Protorthis billingsi Hartt 1868
†Protorthis helena Walcott 1905
†Protorthis laevis Walcott 1905
†Protorthis latourensis Matthew 1886
†Protorthis nautes Walcott 1905
†Protorthis nunnebergensis Walcott 1905
†Protorthis quacoensis Matthew 1886
†Protorthis spencei Walcott 1905
†Protorthis wingi Walcott 1905