Hyperotreti
Nota de aplicación
Order of eel-shaped, scaleless, soft-skinned aquatic primitive vertebrates with paired thick barbels on the end of the snout, a tail fin (but no paired fins), no jaws, cartilaginous skeletons, mouths comprising round or slit-like sucking openings with horny teeth, poorly developed eyes buried under the skin, a single nostril at the end of the snout, and five to 15 pairs of gills used for respiration. They are found in cold seawater, habitually li…