Family Protopteraspididae Novitskaya, 1983

Remarks. Paraphyletic grade.

Genera included. Protopteraspis Leriche, 1924, Stegobranchiaspis Elliott, 1983, Zascinaspis Stensio, 1958, Escharaspis Elliott, 1983, Gigantaspis Heintz, 1962, Loricopteraspis Tarlo, 1961, Canadapteraspis Dineley & Loeffler, 1976, Miltaspis Blieck, 1981 .

Suborder Pteraspidoidei (sensu Pteraspidina Janvier, 1996)

Family Protaspididae (sensu Protaspidinae Blieck 1984)

Genera included. Cyrtaspidichthys Whitley, 1940, Cosmaspis Denison, 1970, Tuberculaspis Ilyes & Elliott, 1994, Helaspis Elliott et al., 2000, Psephaspis Orvig, 1961, Lampraspis Denison, 1970 .