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Order PetromyzontiformesDomain Eukarya Kingdom Animalia Sub-kingdom Eumetazoa Sub-sub-kingdom Bilateria Metaphylum Enterocoelous Coelomates Phylum Chordata Subphylum Vertebrata Class Agnatha Subclass Monorhina Order Petromyzontiformes This group contains the lampreys. Greek: Petromyzon, a genus of lamprey + Latin: forma, shape. (Dorit et al, 1991) |