Phthanoncoceras ellipticum (Lossen, 1860) Dataset The Paleobiology Database Rank SPECIES Classification phylum Mollusca class Cephalopoda order Ellesmeroceratida family Phthanoncoceratidae genus Phthanoncoceras species Cyrtoceras ellipticum Name Homonyms Phthanoncoceras ellipticum (Lossen, 1860)