Every jawed fish has an anal fin, which lies on the underside of the fish behind the fish's anus and in front of its tail, a caudal fin (tail fin) and from one to three dorsal fins (fins on its back). Jawless fish: Lack jaws. Hagfish. They wiggle their body on the ground because they … Learn jawless, cartilaginous, bony fish with free interactive flashcards. There are two categories of jawless fish: hagfish and lampreys. Similarly to the way our inner ear works, the cilia on a fish's sensory cells detects vibrations and passes that information on to the brain. A: They wiggle their body on the ground. These gill covers allow the fish to move … Jawless fish are the most primitive fishes living today. Choose from 88 different sets of jawless, cartilaginous, bony fish flashcards on Quizlet. Feed by suction with the help of a round muscular mouth and rows of teeth. Do not have paired fins and scales like most fish. When the density of water keeps changing, fish use it to move and thereby using less energy. Jawless fish often do not have vertebrae, but cartilaginous fish always have vertebrae. Operculum - These can open and close over the gills, producing a cover. Jawed fish have more well-developed spinal columns than lampreys - jawless fish that are also considered vertebrates. Q: What is the taxonomy (class) of the jawless fish? Asked in Fish , … ... How do they move around? Have cylindrical and long bodies. The best animal I discovered was the jawless fish here are some questions on the jawless fish to answer. Fish use density in order to move in the water since they do not have lungs.