Genus:
Ophioplinthus >
Family:
Ophiopyrgidae >
Suborder:
Ophiurina >
Order:
Ophiurida >
Superorder:
Euryophiurida >
Infraclass:
Metophiurida >
Subclass:
Myophiuroida >
Class:
Ophiuroidea >
Subphylum:
Asterozoa >
Phylum:
Echinodermata >
Kingdom:
Animalia >
Unranked:
Biota >