Cyclostomata

noun plural
Cy·​clo·​sto·​ma·​ta | \ˌsī-klō-ˈstō-mət-ə, ˌsik-lō-, -ˈstäm-ət-ə\

Medical Definition of Cyclostomata 

: a class or order of primitive vertebrates that have a large jawless sucking mouth, no limbs or paired fins, a wholly cartilaginous skeleton with persistent notochord, and 6 to 14 pairs of gill pouches and that include the lampreys and the hagfishes — compare chondrichthyes

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