Lecture 9.1

Lecture 9.1 - cephalocordates No jaws Dorsal fin Myxonoidea...

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Moving on the phylogeny to look at the final group of deuterostomes : chordates echinoderms chordates deuterostomes loph EC AC CF CN P Notochord - connective tissue rod Pharyngeal gill slits Dorsal, hollow nerve cord (spinal cord) anus Post anal tail echinoderms Chordates (4 synapomorphies) deuterostomes loph cephalochordates myxonoidea Eurochordates (sp?) Eurochordates : filter feeders - sessile as adults - Good swimmers Muscle block choron shaped Fossil records Cephalochordates : lancelets - filter feeders - chordates myxinoidea eurochordates
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Unformatted text preview: cephalocordates No jaws Dorsal fin Myxonoidea : "hagfish" : has a "cranium"-Vertebral precursors Cartilaginous blocks along the dorsal midline No jaws Suck blood Filter feeder Marine & freshwater Breed once (salmon, lampreys) then semelparous Breed many years in a row (blue back herring, sturgeon) -iteroparous Anadromous Parasitic Petromyzontoidea: "lamprey"-petromyzontoidea Lecture 9.1 Monday, March 03, 2008 3:07 PM lecture 9.1 Page 1...
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This note was uploaded on 04/20/2008 for the course BIOL 94 taught by Professor Gaut/summers during the Winter '08 term at UC Irvine.

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