BIO 2135 Lecture Notes - Lecture 17: Gill Slit, Axial Skeleton, Fish Scale
21 Mar 2017
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Lateral line sensory system runs the length of the animal. Vibrational system that allows the fish to sense vibrations in the water column. Open pits that open the vibration, vibration moves through medium. Cilia and sensory hairs sense the vibration, causes a reaction. ** there is not universal agreement that all vertebrates have this ** (hagfish) Reduction of the eyes and lateral line system. No lateral fins, just a long eel shape body that moves by undulations. Multiple pharyngeal slits inside go to single opening. It produces slime hydrates quickly and becomes gel instantly (slime sacs) Dental plate rubs against substrate, breaking off material, swallowing it. Needs to hold onto the host; they can take their jaws and use the knotting behavior (holds them in place on the host) Since they are constantly attached to their host, they can"t use the mouth to bring air and water in uses a nostril.
