ammonites
†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

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Ecology: slow-moving shallow infaunal deposit feeder