Cephalopoda - Ammonoidea - Protancyloceratidae

Parent taxon: Protancyloceratidae according to J. Klein et al. 2007

Sister taxa: Cochlocrioceras, Juddiceras, Leptoceras, Parapedioceras, Vinalesites

Subtaxa: Protancyloceras anahuacensis, Protancyloceras barrancensis, Protancyloceras gracile, Protancyloceras guembeli

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Type: Ancyloceras guembeli

Ecology: fast-moving nektonic carnivore