Ammonites semiornatus (d'Orbigny, 1850) Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Mollusca class Cephalopoda family Placenticeratidae genus Placenticeras species Placenticeras semiornatum Name Homonyms Ammonites semiornatus (d'Orbigny, 1850) Ammonites semiornatus (Crick, 1894)