Protocycloceras lamarcki (Billings, 1859) Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Mollusca class Cephalopoda order Nautilida family Nautilidae genus Protocycloceras species Protocycloceras lamarcki Name Synonyms Orthoceras lamarcki (Billings, 1856) Protocycloceras whitfieldi Ruedemann, 1906 Rhabdocycloceras floweri Zhuravleva, 1994 Homonyms Protocycloceras lamarcki (Billings, 1859)