Lecture 15, Ch. 34

Lecture 15, Ch. 34 - Lecture#15 Date Clip s Chapter 34 ~...

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Lecture #15 Date ______ Clip Chapter 34 ~ Vertebrate Evolution and Diversity
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Chordates Notochord : longitudinal, flexible rod located between the digestive and the nerve cord Dorsal, hollow nerve cord ; eventually develops into the brain and spinal cord Pharyngeal slits ; become modified for gas exchange, jaw support, and/or hearing Muscular, postanal tail
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Invertebrate chordates Both suspension feeders…. . Subphy : Urochordata Subphy : Cephalochordata (lancelets); marine, sand dwellers Importance: vertebrates closest relatives; in the fossil record, appear 50 million years before first vertebrate Paedogenesis : precocious development of sexual maturity in a larva (link with vertebrates?)
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Subphylum: Vertebrata Retain chordate characteristics with specializations…. Neural crest : group of embryonic cells near dorsal margins of closing neural tube Pronounced cephalization : concentration of sensory and neural equipment in the head Cranium and vertebral column Closed circulatory system with a ventral chambered heart
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Vertebrate diversity Phy : Chordata
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This note was uploaded on 09/22/2009 for the course BIOL BIOL 51 taught by Professor Janetkoprivnikar during the Spring '08 term at Pacific.

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Lecture 15, Ch. 34 - Lecture#15 Date Clip s Chapter 34 ~...

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