Cephalopoda - Ammonitida - Ptychoceratidae

Full reference: M. Matsukawa. 2021. Aptian (Lower Cretaceous) ammonite fauna of the Todai Formation, Nagano Prefecture, Japan. Cretaceous Research 126(104771)

Parent taxon: Ptychoceratidae according to M. Matsukawa 2021

Sister taxa: Diptychoceras, Ptychoceras

Subtaxa: Inaptychoceras koikei

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Type: Inaptychoceras koikei

Ecology: fast-moving nektonic carnivore

Distribution: found only at Locality A2, Todai area (Cretaceous of Japan)

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Specimen images are retrieved through the ePANDDA API.