Vertebrates-1-st-09

Vertebrates-1-st-09 - Vertebrate Evolution and Diversity...

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Vertebrate Evolution and Diversity
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Will be present at one point in the life cycle, either larval or adult
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Possible scheme for the evolution of the Chordates Have larval & adult form
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Four anatomical features that characterize the phylum Chordata Tail- Evolved in aquatic conditions, propulsion Notochord- between nerve cells & gut, firm flexible support to which muscles are attached, prevents shrinking [remains as intervertebral disks] Dorsal chord- becomes spinal chord Slits- filtering of water, remain as middle ear ossicles
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“Acorn worms” Pharyngeal slits Collar Proboscis Benthic marine worms, live in burrows Not true chordates, do not have postanal tail Larva is sessile Proboscis secretes mucus that traps food Closer to echinoderms Phylum Hemichordata
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Primitive chordates provide clues to the origin of vertebrates 1. Subphylum Urochordata Adult is sessile and feeds via pharyngeal slits.
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Subphylum Urochordata: a tunicate [sea quirt] Has a leathery outer covering [tunic]
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This note was uploaded on 11/06/2011 for the course BIL 160 taught by Professor Krempels during the Spring '08 term at University of Miami.

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Vertebrates-1-st-09 - Vertebrate Evolution and Diversity...

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