Mexican lamprey  (Tetrapleurodon spadiceus)

Taxonomy of Fishes

• Osteichthyes - Bony fishes->
• Chondrichthyes - Cartilaginous fishes->
• Agnatha - Jawless fishes->

  • Myxini - Hagfishes->
  • Petromyzonti - Lampreys->

    • Petromyzontiformes - Lampreys->

      • Petromyzontidae - Lampreys->

        • Eudontomyzon - Eudontomyzon->
        • Lampetra - Lampetra->
        • Petromyzon - Petromyzon->
        • Caspiomyzon - Caspiomyzon->
        • Entosphenus - Entosphenus->
        • Ichthyomyzon - Ichthyomyzon->
        • Lethenteron - Lethenteron->
        • Tetrapleurodon - Tetrapleurodon->

          • Mexican brook lamprey (Tetrapleurodon geminis)
          • Mexican lamprey (Tetrapleurodon spadiceus)
      • Geotriidae - Southern lampreys->
      • Mordaciidae - Southern topeyed lampreys->