Siphonodentalium Sars 1859 (tusk shell)
Scaphopoda - Gadilida - Gadilidae
Parent taxon: Siphonodentaliinae according to P. D. Reynolds and G. Steiner 2008
Sister taxa: Dischides, Polyschides, Sagamicadulus, Striocadulus
Subtaxa: Siphonodentalium adelaidense
Ecology: slow-moving shallow infaunal deposit feeder