†Prothyris (Amphikoilum) Novojilov 1956 (clam)
Bivalvia - Cardiidia - Grammysiidae
Parent taxon: Prothyris according to Novojilov 1956
See also Galli 2013
Sister taxa: Prothyris (Lophoprothyris), Prothyris (Prothyris) acuticarinata, Prothyris (Prothyris) cilindricus, Prothyris contorta, Prothyris elongatus, Prothyris meeki, Prothyris recta, Prothyris soleniformis, Prothyris stubblefieldi
Subtaxa: Prothyris (Amphikoilum) bilobata
Ecology: facultatively mobile infaunal suspension feeder
Distribution: found only at Vashutkinykh lake, Well BK-14, 863 m, Pechora Basin (Permian of Russian Federation)