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Cy·clo·sto·ma·ta

n pl :  a class or other taxon 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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