†FAMILY CHTHAMALIDAE DARWIN, 1854

Diagnosis: Wall composed of eight, six or four plates, without any whorls of supplementary plates; mandible tridentoid or quadridentoid.

Comment: Pérez-Losada et al. (2012b) conducted a multigene molecular phylogeny in Chthamaloidea and showedthatthesubfamiliesChthamalinae,Euraphinae and Notochthamalinae are not monophyletic groups. We did not retain these subfamilies and assign all these genera under Chthamalidae . Neither the number of plates nor the number of mandibular, cuticular ‘teeth’ reflects any phylogenetic pattern in Chthamalidae, as reflected in previous subfamily assignments.

Caudoeuraphia Poltarukha, 1997 (one species)

† Chamaesipho Darwin, 1854 (three species)

Chinochthamalus Foster, 1980 (one species)

Chthamalus Ranzani, 1817 (27 species)

Euraphia Conrad, 1837 (three species)

Hexechamaesipho Poltarukha, 1996 (one species)

Jehlius Ross, 1971 (one species)

Microeuraphia Poltarukha, 1997 (seven species)

Nesochthamalus Foster & Newman, 1987 (one species)

† Notochthamalus Foster & Newman, 1987 (Eocene– Recent) (one species)

Octomeris Sowerby, 1825 (three species)

Pseudoeuraphia Poltarukha, 2000 (one species)

Rehderella Foster & Newman, 1987 (one species)

Tetrachthamalus Newman, 1967 (two species)