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Unformatted text preview: 33.1-33.2 Outline Deuterostomes o largest bodies and complex animals o three types echinodermata hemichordate chordate o triploblastic and have a coelom o Reversion of radial symmetry Five sided radial symmetry o Water vascular system Body contain series of continuous fluid-filled tubes and chambers Tube feet Elongated, fluid filled structures Podia Feet/ sections of the tube feet that project outside body and make contact with substrate Contract and release to made individual move o Endoskeleton Hard, supportive structure inside the body Calcium carbonate echinodermata o sea stars, sea urchins o herbivores hemichordate o acorn worms o deposit feeding/suspension feeding water enters through mouth and leaves through gills o pharyngeal gill slits- opening in throat o chordate o urochordates sea squirts small suspension feeders adults are sessil, ocean dwelling suspension feeders o cephalochordates amphioxus small mobile suspension feeders adults live in ocean bottom and burrow in sand o vertebrates animals with skull most have backbone gills main gas-exchange organ o sharks, bony fishes, amphibians, reptiles, mammals o 4 Features pharyngeal gill slits- opening in throat notochord-stiff but flexible rod that runs body length dorsal hollow nerve cord- bundle of nerve cells that runs length of body muscular tail Fossil Record o Ordovician Bone Formed extoskeleton o 430 million years ago vertebrates with jaws o Transfer to land of vertebrates Tetrapods o Amniota Lineage of vertebrates including tetropods that aren't amphibians Amniotic egg ...
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- Spring '08
- gill slits- opening, echinodermata hemichordate chordate