Cephalopoda - Ammonoida - Trachyceratidae
Invalid subtaxa: Polycyclus Mojsisovics 1889 [replaced name], Polysphinctoceras Spath 1934 [objective synonym], Smithoceras Hanna 1924 [replaced name]
Full reference: J. R. B. Tomlin. 1931. Some preoccupied generic names. III. Proceedings of the Malacological Society of London 19:174-175
Parent taxon: Trachyceratidae according to E. T. Tozer 1981
See also Hanna 1924, Sepkoski 2002, Spath 1934, Spath 1951 and Tomlin 1931
Sister taxa: Anolcitinae, Arpaditinae, Boreotrachyceras, Brotheotrachyceras, Haoceratinae, Langdaiceras, Nannites, Okhototrachyceras, Protrachyceratinae, Sirenitinae, Trachyceratinae
Subtaxa: Hannaoceras nasturtium Polycyclus henseli
Type: Ammonites nasturtium
Ecology: nektonic carnivore
Distribution:
• Triassic of Austria (1 collection), Canada (3: British Columbia), Italy (1), Nepal (1), United States (7: Alaska, California, Nevada, Oregon)
Total: 13 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
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