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Zemistephanus (ammonite)

Cephalopoda - Ammonitida - Otoitidae

PaleoDB taxon number: 15822

Parent taxon: Otoitidae according to W. J. Arkell et al. 1957

Sister taxa: Docidoceras, Emileia, Frogdenites, Otoites, Parachondroceras, Pseudotoites

Subtaxa: Zemistephanus armatus, Zemistephanus corona

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Ecology: fast-moving nektonic carnivore