When he established the name, Woodring did not side Pernidae or Melinidae but cited Perna and Melina as synonyms of Isognomon. Isognomonidae is in prevailing usage and it is conserved under Art. 40.2 with the precedence of Pernidae (1828). -inae, n.t. Eberzin, 1960. Osnovy paleontologii, molluski...:80; -oidea, n.t. Nevesskaya, 2003, Paleontologichesky Zhurnal 37:suppl.6:617.
Type genus: Isognomon [Lightfoot], 1786