ammonites
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

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Ecology: slow-moving shallow infaunal deposit feeder