Subfamily Gastrochaeninae Gray 1840 (clam)
Bivalvia - Cardiida - Gastrochaenidae
Parent taxon: Gastrochaenidae according to J. G. Carter et al. 2011
Sister taxa: Cucurbitula, Eufistulana, Eufistulaninae, Gastrochaena, Gastrochaenopsis, Kummelia, Lamychaena, Spengleriinae
Subtaxa: Stenochaena
Ecology: stationary boring suspension feeder
Distribution: found only at InGOK quarry (Eocene to Eocene of Ukraine)