Cephalopoda - Ammonitida - Olcostephanidae

Full reference: R. W. Imlay. 1940. Neocomian Faunas of Northern Mexico. Geological Society America Bulletin 51(1):117-190

Belongs to Maderia according to R. W. Imlay 1940

Sister taxa: Olcostephanus (Jeannoticeras), Olcostephanus (Olcostephanus), Olcostephanus (Viluceras), Olcostephanus astierianus, Olcostephanus atherstoni, Olcostephanus delicatecostatus, Olcostephanus detonii, Olcostephanus paucicostatus, Olcostephanus pecki, Olcostephanus popenoei, Olcostephanus sanlazarensis, Subastieria inordinata, Subastieria sulcosus, Subastieria sulcosae, Subastieria balkanica, Maderia coahuilensis, Maderia marcosensis, Taraisites bosei, Astieria bangei, Astieria zacatecana, Astieria raricostata, Astieria neohispanica, Holcostephanus (Astieria) josephinus

Type specimen: UMMP 18060, a shell

Ecology: fast-moving nektonic carnivore

Average measurements (in mm): shell diameter 27.3

Distribution: found only at 58-Coahuila (Cretaceous of Mexico)

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Specimen images are retrieved through the ePANDDA API.