Sipunculus titubans var. diptychus Fischer, 1894 Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Animalia phylum Sipuncula class Sipunculidea order Sipunculiformes family Sipunculidae genus Sipunculus species Sipunculus nudus Name Homonyms Sipunculus titubans diptychus W.Fischer, 1895 Sipunculus titubans var. diptychus Fischer, 1894