Ptychodus decurrens Agassiz, 1838 Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Chordata class Elasmobranchii family Ptychodontidae genus Ptychodus species Ptychodus decurrens Name Synonyms Ptychodus depressus Dixon, 1850 Ptychodus multistriatus Woodward, 1889 Ptychodus oweni Dixon, 1850 Homonyms Ptychodus decurrens Agassiz, 1838