BIO 2135 Lecture Notes - Lecture 16: Shark Fin Soup, Shark Finning, Cyclostomata
17 Apr 2016
School
Department
Course
Professor
Document Summary
Neural crest cells induce development of the nervous system in other organs. These cells determine what will form in the body. Oten removed from the list and placed ater mixini. Can defend selves by tying itself into knots. Represent the vertebrate body that reduced the vertebrae for extreme lexibility. Mixini and pteromyzonida are sister groups that actually belong together cyclostomata. Animals with a circular mouth the jawless ishes. Cyclostomata - no jaw: mouth is always open, mouth pushes down against where its atached and pulls to anchor in place. o. The pressure created by the knot allows the hagish to pull the issue up: has teeth on its tongue that wags and saws away at issue it feeds on, swallow it, and ingests it. Eat from the inside out (unique feeding machine that is highly adapive). o. Dead carcasses (crawls in through anal/ digesive/ gill openings. ) Sensory structure at the base of all ishes.
