Cephalopoda - Orthocerida - Proteoceratidae

Synonym: Hammelloceras Shimizu and Obata 1935

Parent taxon: Proteoceratidae according to C. Teichert et al. 1964

Sister taxa: Archigeisonoceras, Baykonuroceras, Cyrtactinoceras, Ephippiorthoceras, Euorthoceras, Gangshanoceras, Isorthoceras, Liulinoceras, Mesnaquaceras, Metephippiorthoceras, Monomuchites, Orthonybyoceras, Paraproteoceras, Proteoceras, Pseudoliolinoceras, Stereospyroceras, Tofangoceras, Transorthoceras, Treptoceras, Ulmioceras

Subtaxa: Gorbyoceras clathroannulatum, Gorbyoceras gorbyi, Gorbyoceras gracile, Gorbyoceras hammelli, Gorbyoceras tetreauense, Gorbyoceras textumaraneum

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Ecology: nektonic carnivore