BIO 2135 Lecture 16: Lecture 16 - Fishes
22 Mar 2017
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Document Summary
Becomes placodes - precursors to form complex organsm and systems. Birational system allowing fish to sense vibrations in water system. Vibration through medium to hit the sensory hairs on sensory cells. At base of vertabrates or right above mixini. Feed on carcass of bodies at the bottom of the ocean. Knotting in other direction to clamp onto host. Cannot use water current to aerate the gills. Pharyngeal gill sacs all exit through common pore. Has a notochord because it is very flexible compared to the vertabrae. Now detect that vertabrae gene are turned on and small stubs are made but not continued. No jaw = mouth stays open all the time. Depends on the what you believe should be a. Unique feeding structure with circular suction mouth with keratinized teeth. Same life cycle thing as salmon, migrating on fresh water etc. Uses a lot of notochord but starts on skeleton. Seven spiracle openings (spiracle is general word) (gill openings)
