LAB__9_-Vertebrates - VERTEBRATES Main characteristics of...

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VERTEBRATES Main characteristics of Chordates: a dorsal notochord a dorsal, hollow nerve cord pharyngeal gill slits a post-anal tail Phylum Chordata has 3 subphyla: Urochordata , Cephalochordata * and Vertebrata * Amphioxus or Lancelet
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Deuterostomes (Echinodermata and Chordata) blastopore becomes anus radial and indeterminate cleavage of blastula mesoderm formed from gut pouches coelom formed from mesodermal pouches
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Some Characteristics of Vertebrates * * fishes, amphibians, reptiles, birds and mammals vertebral column replaces embryonic notochord dorsal hollow nerve cord brain and nerves 2-, 3- or 4-chambered heart eyes have a lens and a retina 2 pairs of appendages muscles attached to endoskeleton serve for locomotion
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A vertebra Neural arch
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SIMILAR STRUCTURES HOMOLOGOUS – structures that are similar due to evolutionary origin ANALOGOUS – structures that evolve separately to perform a similar function VESTIGIAL – homologous structures that lose the specific function in descendents
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Kingdom: Animalia Phylum: Chordata Subphylum: Vertebrata Superclass: Pisces 3 classes of fishes : 1. Agnatha – jawless fishes. No scales or jaw. Live as parasites.
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