†family Hardistiellidae Halstead 1993 (lamprey)
Agnatha - Petromyzontiformes - Hardistiellidae
Parent taxon: Petromyzontiformes according to R. Van Der Laan 2019
Sister taxa: Euphanerops, Geotriidae, Mayomyzon, Mayomyzontidae, Mesomyzon, Mordaciidae, Petromyzontidae, Priscomyzon
Subtaxa: Hardistiella
Ecology:
Distribution: found only at MV 7106, Supercrop Quarry, Bear Gulch (Carboniferous of Montana)