Nautilus japonicus (Shimizu, 1926) Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Mollusca class Cephalopoda order Nautilida family Nautilidae genus Eutrephoceras species Nautilus japonicus Name Synonyms Cymatoceras japonicum (Shimizu, 1926) Eutrephoceras japonicum (Shimizu, 1926) Homonyms Nautilus japonicus (Shimizu, 1926)