Animal Diversity 3 Deuterostomes: Echinodermata and Chordata

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  • Animal Diversity 3 Deuterostomes: Echinodermata and Chordata
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  • Echinodermata & Chordata
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  • Echinodermata Spiny skin Endoskeleton of spiny plates Marine animals (no freshwater or terrestrial species) Adults = radial; larvae = bilateral Water vascular system (used for feeding, gas exchange, and locomotion) Canals end in tube feet; opening = madreporite
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  • Bilateral Larva
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  • Chordata Pharyngeal slits/pouches Dorsal nerve cord Notochord Post-anal tail
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  • Pharyngeal slits
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  • Dorsal (hollow) nerve cord Nerve cord Notochord
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  • (versus solid, ventral nerve cord)
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  • Notochord Nerve cord Notochord Flexible rod that supports the nerve cord (becomes intervertebral discs in between vertebrae in humans.)
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  • Post anal tail
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  • (body extends past the anus...)
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  • Chordata Pharyngeal slits/pouches Dorsal nerve cord Notochord Post-anal tail
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  • Subphyla Tunicata (once called Urochordata) Craniata Cephalochordata
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  • Example: lancelets
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  • Tunicata
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  • Craniata (Vertebrata)
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  • Specimens today Lancelet (one per table) Lamprey Sea cucumber Sea Urchin Sea Star

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