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Billingsella coloradoensis
Taxonomy
Orthis coloradoensis was named by Shumard (1860).
It was recombined as Billingsella coloradoensis by Walcott (1905), Walcott (1912), Freeman and Stitt (1996).
It was recombined as Billingsella coloradoensis by Walcott (1905), Walcott (1912), Freeman and Stitt (1996).
Sister species lacking formal opinion data