Hydrachna geographica, 1999 Dataset GBIF Backbone Taxonomy Rank SPECIES Published in 1999. Classification kingdom Animalia phylum Arthropoda class Arachnida order Trombidiformes family Hydrachnidae genus Hydrachna species Hydrachna geographica Name Homonyms Hydrachna geographica O.F.Müller, 1776 Hydrachna geographica, 1999