Concept 34

Concept 34 - Concept 34.3 Vertebrates are craniates that...

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Concept 34.3: Vertebrates are craniates that have a backbone \ They have - Vertebrae enclosing a spinal chord - An elaborate skull - Fin rays, in aquatic forms Lampreys Class Petromyzonatida Oldest living lineage of vertebrate Vertebrae are cartilaginous segments surrounding the notochord and arching partly over the nerve chord Jawless Mineralization appears to have originated with vertebrate mouthparts - Conodonts were 1 st with mineralized mouth & pharyngeal parts - Ostracoderms had mineralized plates on their skin Endoskeleton became mineralized later Concept 34.4: Gnathostomes are vertebrates that have jaws The most successful group of vertebrates alive today Derived Characters of Gnathostomes Jaws - Evolved from skeletal supports of the pharyngeal slits Enhanced sensory system, including lateral line system Mineralized endosystem Paired appendages Figure 34.13
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This note was uploaded on 03/27/2010 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Concept 34 - Concept 34.3 Vertebrates are craniates that...

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