Chapter 34 DEUTEROSTOME ANIMALS

Chapter 34 DEUTEROSTOME ANIMALS - Chapter 34 DEUTEROSTOME...

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Chapter 34 DEUTEROSTOME ANIMALS From Starfish to Man The Earth’s largest and most complex organisms. Summary *Why are deuterostome animals important? *General Characteristics *Phylogeny *Fossils *DNA analysis *4 phyla in detail Why are Deuterostome Animals Important? *We are deuterostomes *We eat deuterostomes *Deuterostomes are our pets *Dominate the upper levels of marine and terrestrial food chains ****Once used as transportation, power. General Characteristics *Unique embryonic development *Coelom ***Endoskeleton ***Development of efficient organ systems, especially the cardiovascular and respiratory systems. *Reproduction is refined *Amniotic egg *Placenta and live birth *Nurturing of young *Development of limbs ***Development of brain Phylogeny *Fossil record highlights *550 mya – Echinoderms appeared *480 mya – bone evolved *430 mya – jaws evolved *350 mya – tetrapods appeared *330 mya – amniotic egg evolved Deuterostome Animals *4 phyla *Invertebrates *Echinodermata *Hemichordata *Xenoturbellida *Vertebrates 1
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*Chordata Phylum Echinodermata *General Characteristics *Marine habitats – shallow water to ocean trenches. *Endoskeleton of calcium rich plates, called ossicles , beneath the skin. In many adults the plates fuse. *Adults have pentaradial symmetry; larvae have bilateral symmetry. *General Characteristics *Water vascular system – kind of a hydrostatic skeleton, Figure 34.3 *Central ring canal (opening = madreporite ) with… *5 (or multiples of 5) radial canals . *Tube feet are used for movement and food capture and are controlled by ampullae at their base. *Reproduction *Asexual regeneration of body parts *Sexual with external fertilization *5 classes **Asteroidea – sea stars **Ophiuroidea – brittle stars **Echinoidea – sand dollars, sea urchins; 5 part body plan but no arms *Holothuroidea – sea cucumbers *Crinoidea – sea lilies Phylum Xenoturbellida *“Strange worms” – wormlike *No gut, coelom or brain *New phylum as of 2006 *So new no one has take a picture of one – but there is only a single species. Phylum Hemichordata
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This note was uploaded on 09/08/2011 for the course BIOL 1403 taught by Professor Dini during the Fall '09 term at Texas Tech.

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Chapter 34 DEUTEROSTOME ANIMALS - Chapter 34 DEUTEROSTOME...

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