Bis2CF10.Lecture%2035

Bis2CF10.Lecture%2035 - Fall 2010 Lecture 35. Chordata...

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Fall 2010 Lecture 35. Chordata Quick tour of the phyla we missed Introduction to Chordates Students should be able to: explain how members of the 3 chordate subphyla differ discuss the evolution of the fish- like body from urochordate ancestors describe the position and function of the notochord explain how the vertebral column forms in development and how it relates to the notochord explain how jaws evolved and what evidence supports this idea Urochordata, Cephalochordata, Vertebrata
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Placozoa, Mesozoa, Acoelomorpha, Nemertea
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Gnathostomulida, Micrognathozoa, Rotifera x 2, Acanthocephala, Cycliophora, Gastrotricha
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Entoprocta, Phoronida, Brachiopoda, Bryozoa, Echiura, Sipunculida
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Priapulida, Kinorhyncha, Loricifera, Tardigrada, Nematomorpha
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Chaetognatha, Hemichordata Xenoturbellida
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What are chordates? Sea squirts, lancelets, jawless fishes, jawed fishes, and tetrapods (amphibians, reptiles, mammals) Deuterostomes with… Notochord Dorsal tubular nerve cord Post-anal tail Pharyngeal slits endostyle/thyroid at least in embryo
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Why are pharyngeal slits not considered a synapomorphy of chordates? a) Because they do not occur in all chordates. b) Because they evolved convergently in hemichordates and cephalochordates. c) Because they have been further modified within the chordates.
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This note was uploaded on 04/19/2011 for the course BIOLOGY BIS 2C taught by Professor Doyle during the Fall '10 term at UC Davis.

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Bis2CF10.Lecture%2035 - Fall 2010 Lecture 35. Chordata...

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