root › cellular organisms › Eukaryota › Opisthokonta › Metazoa › Eumetazoa › Bilateria › Deuterostomia › Echinodermata › Eleutherozoa › Asterozoa › Ophiuroidea › Myophiuroidea › Metophiurida › Ophintegrida › Amphilepidida › Ophiurina › Gnathophiurina › Amphiuroidea › Amphiuridae › Amphiura › Amphiura filiformis