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hood-shaped structure supported by a cartilaginous ring that serves as a sucking disc for attachment to a host
only vertebrates with body fluids isotonic to sea water, secret large amounts of mucus, rudimentary eyes, three pairs of barbels
oral disc, separate external openings for each gill slit, dorsal median nostril, undergo metamorphosis (from ammocoete larva)
spiracle, ventral gill slits, enlarged pectoral fins fused to the head, dorsal denticles, spine
skate and ray characteristic
internal skeletons made of bone, bony scales, air bladder used for buoyancy
fleshy lobes on the paird fins, a lung, some can withstand drying by encasing themselves in mucus and mud
a pair of dorsal _____ posterior to the eyes are modified gill slits that open into the pharynx; serve for water intake when a shark is feeding.
a white line on each side of the trunk, representing a row of minute, mucus-filled sensory pores used to detect the presence of other animals
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