Superclass Agnatha/Jawless Fish, Lamprey, Hagfish, Slender eel-like body, Biting mouth with 2 rows of reversible teeth, 3 accessory hearts, 1 main heart, Commonly parasitic, Sucker-like oral disc with rasping teeth, Pore-like gill openings, No paired appendages, Superclass Gnathostomata/Jawed Fish, Skeleton can be cartilaginous or bony, Paired appendages like pectoral/pelvic fins, Flexible jaws, Have thin, feathery sheets of gills, May show parental care, Many make nests or beds, Have eyes equipped for far vision, Have paired & unpaired appendages, Some can grow up to 35 ft. long & weigh 20 tons.

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