Polystomella umbilicatula Williamson, 1858 Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Protozoa class Granuloreticulosea order Foraminiferida family Elphidiidae genus Polystomella species Polystomella umbilicatula Name Homonyms Polystomella umbilicatula (Walker & Jacob, 1798)