Sphaeriodiscus placenta (Mueller & Troschel, 1842) Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Echinodermata class Asteroidea order Valvatida family Goniasteridae genus Peltaster species Peltaster placenta Name Homonyms Sphaeriodiscus placenta (Mueller & Troschel, 1842)