Which eel-like fish has a sucker mouth with horny teeth, and a rough tongue, but no scales, paired fins, or jaws?
Sea lamprey Sea lamprey The sea lamprey ("Petromyzon marinus") is a parasitic lamprey native to the Northern Hemisphere. The sea lamprey has an eel-like body without paired fins. Its mouth is jawless, round and sucker-like, and as wide or wider than the head; sharp teeth are arranged in many consecutive circular rows. There are 7 branchial openings behind the eye. They are olive or brown-yellow on the dorsal and lateral part of the body, with some black marblings, with lighter coloration on the belly. Adults can reach a length of up to and a body weight up to . The species is
Fish jaw has no ethmoid membrane (floor) and is attached only by the hinge and a modified tongue bone. There are several large, fang-like teeth in the front of the jaws, followed by many small barbed teeth. There are several groups of pharyngeal teeth that serve to direct food down the esophagus. Another deep sea fish, the pelican eel, has jaws larger than its body. The jaws are lined with small teeth and are loosely hinged. They open wide enough to swallow a fish larger than the eel itself. Distichodontidae are a family of fresh water fishes which can be divided into