Ponderoceras annulatum (Iredale & Laseron, 1957) Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Mollusca class Gastropoda order Littorinimorpha family Caecidae genus Ponderoceras species Ponderoceras annulatum Name Synonyms Ctiloceras annulatum Iredale & Laseron, 1957 Homonyms Ponderoceras annulatum (Iredale & Laseron, 1957)