†subfamily Siphonodentaliinae Simroth 1894 (tusk shell)
Scaphopoda - Gadilida - Gadilidae
Alternative spelling: Siphonodentaliidae
Parent taxon: Gadilidae according to P. D. Reynolds and G. Steiner 2008
Sister taxa: Calstevenus, Gadilinae, Gadilopsis
Subtaxa: Dischides, Polyschides, Sagamicadulus, Siphonodentalium, Striocadulus
Ecology: slow-moving shallow infaunal deposit feeder