Psychroplanes rigida (Théel, 1882) Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Animalia phylum Echinodermata class Holothuroidea order Elasipodida family Elpidiidae genus Psychroplanes species Psychroplanes rigida Name Synonyms Elpidia rigida Théel, 1882 Peniagone expansa Koehler & Vaney, 1905 Peniagone rigida (Thiel, 1882) Peniagone stabilis Koehler & Vaney, 1905 Homonyms Psychroplanes rigida (Théel, 1882)