Ch 33 - Invertebrates (PART 2 of 2)(1 slide per page)-1

Lateral canal 6 tube foot a ampula b podium podia

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Unformatted text preview: ndoskeleton) • Most w/ spines 126 Ossicles A. Separate - connected by - muscle or - ligaments OR B. Fused - aka “test” in urchins 127 Water Vascular System aka sieve plate Madreporite 1. Madreoporite - Water enters or leaves system 2. Stone canal – connects 1 to 3 3. Ring canal 4. Radial Canal 5. Lateral canal 6. Tube foot A. Ampula B. Podium (podia) Functions of water vascular system Locomotion, sensory, feeding, respiration, food & waste transport, excretion Figure 33.39 (Campbell et al) 128 Tube Feet No suckers – move by applying a cement which can be biochemically reversed as it moves Urchin Sensory tube feet 129 3. Crinoidea 1. Asteroidea 2. Ophiuroidea Echinoderm 4. Echinoidea Diversity 5 Major Classes ~7000 spp 5. Holothuroidea 130 1. Class Asteroidea: sea stars • Large central disk • Thick arms (usually 5) “star-like” 131 1. Class Asteroidea • Organs in disk and arms • Complete digestive system • Downward facing mouth • Upward facing anus & madreporite http://www.biog1105-1106.org/labs/deuts/media/echinowatervasc.jpg 132 1. Class Asteroidea Feeding: • Active predators 133 1. Class Asteroidea Feeding: • Some evert stomach onto or into prey e.g. into a bivalve 134 1. Class Asteroidea: sea stars In some the arms are fused Culcita novaguineae 135 2. Class Ophiuroidea: brittle stars • Small central disk • Thin, fragile arms • Organs NOT in arms “snake-like” • Tube feet without podium portion (only ampulla) • Incomplete digestive system (i.e. No anus (mouth=anus)) • Mad...
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This note was uploaded on 02/12/2014 for the course BIOLOGY 2011 taught by Professor Woo during the Fall '10 term at University of Central Florida.

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