Engonoceras serpentinum (Cragin, 1900) Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Mollusca class Cephalopoda family Engonoceratidae genus Engonoceras species Engonoceras serpentinum Name Synonyms Sphenodiscus serpentinus (Cragin, 1900) Homonyms Engonoceras serpentinum (Cragin, 1900)