Subfamily Heteroschismoidinae Christikov 1982 (tusk shell)
Scaphopoda - Gadilida - Entalinidae
Parent taxon: Entalinidae according to P. D. Reynolds and G. Steiner 2008
Sister taxa: Bathoxiphinae, Entalininae
Subtaxa: Entalinopsis Heteroschismoides Pertusiconcha Spadentalina
Ecology: slow-moving shallow infaunal deposit feeder
Distribution: there are no occurrences of Heteroschismoidinae in the database