Cephalopoda - Ammonitida - Collignoniceratidae

Alternative combination: Prionotropis mexicana

Synonym: Pseudaspidoceras chispaense Adkins 1931

Belongs to Selwynoceras according to J. D. Powell 1963

Sister taxa: Collignoniceras bravaisianum, Collignoniceras carolinum, Collignoniceras jorgenseni, Collignoniceras klamathensis, Collignoniceras percarinatum, Collignoniceras praecox, Collignoniceras vermilionense, Collignoniceras woollgari, Prionotropis caurinus, Prionotropis hiltensis

Ecology: fast-moving nektonic carnivore

Average measurements (in mm): shell diameter 75.0

Distribution: found only at Cannonball Hill (Cretaceous of Mexico)

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Specimen images are retrieved through the ePANDDA API.