Sphaerococcus durus C.Agardh, 1822 Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Rhodophyta class Florideophyceae order Gracilariales family Gracilariaceae genus Gracilaria species Gracilaria dura Name Homonyms Sphaerococcus durus De Lotto, 1969 Sphaerococcus durus C.Agardh, 1822