SUPERFAMILY CORONULOIDEA LEACH, 1817

Diagnosis: Wall of eight (rostrum discernibly tripartite), six or four plates; plates tubiferous; tubes formed between inner and outer lamina, between internal buttresses or between external ribs; radii solid; basis membranous or weakly calcareous. First three pairs of cirri modified as maxillipeds.

Comment: The presence of three pairs of mouth cirri is synapomorphic with the Balanoidea; the members seem originally to have inhabited the rocky intertidal zone, but many members have been both morphologically and biologically adapted to epibiosis on a wide variety of invertebrate and vertebrates.