Caseyidae Verhoeff, 1909
Opiona berryessae Gardner & Shelley, 1989
Opiona bifurcata Gardner & Shelley, 1989
Opiona casualis Gardner & Shelley, 1989
Opiona columbiana Chamberlin, 1951
Opiona communis Gardner & Shelley, 1989
Opiona confusa Gardner & Shelley, 1989
Opiona distincta Gardner & Shelley, 1989
Opiona exigua Gardner & Shelley, 1989
Opiona facetia Gardner & Shelley, 1989
Opiona fisheri Gardner & Shelley, 1989
Opiona goedeni Gardner & Shelley, 1989
Opiona scytonotoides Gardner & Shelley, 1989
Opiona siliquae Causey, 1963
