Superfamily Isognomoidea Woodring 1825 (clam)
Parent taxon: Mytiloida according to L. A. Nevesskaja 2009
Sister taxa: Fungiacara, Lunulacardioidea, Malleoidea, Modiolopsoidea, Modiomytilus, Myapalmula, Mysidielloidea, Mytiloidea, Mytilon, Paramusculus, Regoria, Regulifer, Septiola, Skarlatella, Striamodiolus, Strimodiolus
Subtaxa: none
Ecology: stationary low-level epifaunal suspension feeder
Distribution: there are no occurrences of Isognomoidea in the database