Cephalopoda - Goniatitida - Gastrioceratidae

Alternative combination: Ammonites listeri

Synonym: Gastrioceras marianum Smith 1896

Belongs to Gastrioceras according to F. B. Plummer and G. Scott 1937

Sister taxa: Gastrioceras magoffinense, Gastrioceras montgomeryense, Gastrioceras noduliferum, Gastrioceras occidentale, Gastrioceras richthofeni, Gastrioceras smithwickense, Gastrioceras williamsi

Ecology: fast-moving nektonic carnivore