Parent taxon: Polyplacophora according to E. Schwabe and P. Lozouet 2006
Sister taxa: Dycheiidae, Mesoplacophora, Multiplacophora, Paleoloricata, Prisochiton
Subtaxa: Abyssochitonidae, Acanthochitonina, Acanthopleura, Afossochiton, Amicula, Austrochiton, Beloplaxus, Chaetopleuridae, Chitonidae, Chitonina, Colapterochiton, Crenatolorica, Cryptoconchus, Cryptoplacidae, Cyanoplax, Cymatochiton, Elachychiton, Eulachychiton, Euleptochiton, Glaphurochiton, Glyptochiton, Guildingia, Hanleyidae, Kindbladochiton, Laculina, Lavenachiton, Lepidopleurina, Lirachiton, Llandeilochiton, Loboarochiton, Mesochiton, Mopaliidae, Nuttallina, Permochiton, Proleptochiton, Protalochiton, Protochiton, Pseudoischnochiton, Stenoplax, Tonicella, Trachypleura, Xylochitonidae
Ecology: facultatively mobile epifaunal grazer