Hesse (1936) described Priscacara campi from a single complete fossil found in the Middle Eocene Roslyn Formation of central Washington.

[3] A third species, Priscacara aquilonia was described by Wilson (1977) from the Early Eocene "Horsefly shale" of British Columbia.

[6] C. liops is the most common species of Priscacara within the Green River lacustrine deposits and at certain locations it outnumbers P. serrata by over 3:1.

The two species differ in the number of dorsal and anal fin rays, as well as possibly a coarser serrated rear edge of the preopercle in P. serrata.

C. liops also has small conical teeth on the pharyngeal jaw, whereas P. serrata has large grinding toothplates, suggesting a diet of snails and crustaceans.