Opisthobranchidae

Opisthobranchidae includes all Narkys on Sagan 4.

Domain: Eukaryota
 * Kingdom: Mancerxa
 * Phylum: Konydonta
 * Class: Monodontoida
 * Order: Monodontomorpha
 * Family: Opisthobranchidae
 * Cetiozoon monodonta
 * Cetiozoon ruddercornus