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The Catophragmidae are divided into the subfamilies Catophragminae, in the northern hemisphere, and Catomerinae n. subfam., in the southern hemisphere. The former includes Catophragmus and Catolasmus n. gen., and the latter, Catomerus. All of the genera are considered monotypic, but our preliminary studies suggest there may be two species of Catomerus in Australian and Tasmanian waters and two, if not three, species of Catophragmus in the Caribbean and Western-Atlantic regions. A computer-based phylogenetic analysis of relationships among basal balanomorphs and certain other barnacles that exhibit apparently more plesiomorphic grades of organization results in a fully resolved branching tree with the chionelasmatids occupying the most basal position among the balanomorphs. Waikalasma is placed in Waikalasmatidae, n. fam., and assigned to the Superorder Chionelasmatoidea
