†SUPERFAMILY CHTHAMALOIDEA DARWIN, 1854

Diagnosis: Monophyletic by molecular analyses; shell plates composed of rostrum, carina and one to three pairs of marginals (eight or six or four wall plates); the wall can be surrounded by one or more whorls of imbricating plates; wall plates and radii solid, internal surface of wall plates lacks uniform ribs; basis often membranous, when calcareous, solid but not forming complex interdigitations with walls; two pairs of mouth cirri; penis without basidorsal point; caudal appendages multi-articulate when present.

Comment: The morphology of this superfamily is the most plesiomorphic within the Balanomorpha . The five families are all monophyletic by molecular analyses in the study by Chan et al. (2017a).