Aculifera - Paleoloricata - Mattheviidae
Synonyms: Chelodidae Bergenhayn 1943, Robustidae Stinchcomb and Darrough 1995
Full reference: C. D. Walcott. 1886. Second contribution to the studies on the Cambrian faunas of North America. United States Geological Survey Bulletin 30:1-365
Parent taxon: Paleoloricata according to Y. Oh et al. 2025
See also Cherns 1998, Fisher 1962, Pojeta et al. 2010, Runnegar et al. 1979 and Stinchcomb and Darrough 1995
Sister taxa: Alastega, Arctoplax, Aulochitonidae, Bursata, Chelodina, Cobcrephora, Echinochitonidae, Hawthorneachiton, Kulindroplax, Phthipodochiton, Plectrochiton, Priscochiton, Probolaeum, Septemchiton, Septemchitonida, Solenocaris, Thairoplax
Subtaxa: Avannaplax Calceochiton Chelodes Conodia Eukteanochiton Hemithecella Matthevia Qaleruaqia Robustum Spicuchelodes
Distribution:
• Devonian of Australia (3 collections)
• Silurian of Czechia (1), Sweden (2)
• Ordovician of Australia (2), Czechia (1), Poland (1), United States (15: Kentucky, Missouri, Virginia)
• Cambrian of Greenland (2), United States (21: Missouri, New York, Utah, Wisconsin)
Total: 48 collections including 57 occurrences