Petromyzontida - Petromyzontiformes - Hardistiellidae

Parent taxon: Petromyzontiformes according to R. van der Laan 2019

Sister taxa: Caeruleum, Geotriidae, Mayomyzon, Mayomyzontidae, Mesomyzon, Mordaciidae, Petromyzontidae, Priscomyzon

Subtaxa: Hardistiella

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Ecology: planktonic suspension feeder

Distribution: found only at MV 7106, Supercrop Quarry, Bear Gulch (Carboniferous of Montana)

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