1 - Lecture 33 Notes

2 1 2 3 3 enlarged brain cranium vertebral column

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Unformatted text preview: 2.  3.  4.  1. pharyngeal slits (lost in Echinodermata) dorsal hollow nerve notochord postanal tail 3. 4. 2. 1.  2.  3.  4.  1. pharyngeal slits (lost in Echinodermata) dorsal hollow nerve notochord postanal tail 3. 4. 2. 5. 5. segmented body muscles 1.  Enlarged brain 2.  Cranial skeleton (braincase) 3.  Vertebral column (supporting dorsal structure) of bone or cartilage 1. 2. 3. •  •  •  •  Trends in vertebrate evolution increased cephalization increased agility of movement new feeding modes (especially predation) physiological upgrading 1. 2. 1.  2.  3.  3. Enlarged brain Cranium Vertebral column Vertebrates have colonized a wide variety of environments Vertebrates have colonized a wide variety of environments Vertebrates have colonized a wide variety of environments Hagfishes: scavengers on dead animal carcasses •  •  •  no bone, no jaws tongue with rasping teeth can *e themselves in knot for greater leverage when tearing food from prey •  produce copious amounts of slime hSp://www.youtube.com/watch?v=Bb2EOP3ohnE (hagfish was anesthe*zed for experiment) hSp://www.guardian.co.uk/fashion/shortcuts/2013/apr/03/hagfish ­slime ­new ­lycra Vertebrates have colonized a wide variety of environments Lamprey: bloodsucking parasite of fish! •  •  •  no bone, no jaws sucker ­like mouth and rasping teeth larvae are mud ­dwelling ...
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This document was uploaded on 06/25/2013.

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