G.Chordata - Phylum Chordata E m b r y o n ic d e v e lo p...

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1 Phylum Chordata • Embryonic development: – Triploblastic – Bilateral symmetry – Eucoelomate – Deuterostome • Special features: Notochord Dorsal hollow nerve tube Post-anal tail Segmentation mesodermal blocs pharyngeal arches and slits Phylum Chordata — subphylum Protochordata • Special features: No cephalization pharyngeal arches and slits ciliated atrium Open circulatory system • Classes: – Urochordata – Larvacea – Cephalochordata Urochordates - tunicates Cephalochordates - lancelets Phylum Chordata — subphylum Vertebrata (Craniata) • Special features: Prolonged embryonic development Strong cephalization Brain in cranium mesodermal blocs Closed circulatory system Agnathans — jawless vertebrates Gnathostomes — jawed vertebrates Fishes — axial skeleton only Tetrapods — axial + appendicular skelton Axial skeleton of a bony fish Figure 3.02 Axial skeleton: Vertebra
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2 a bipedal tetrapod Figure 49.26 key Axial skeleton Appendicular skeleton Cranium Pectoral girdle Vertebra Pelvic girdle Phylum Chordata — subphylum Vertebrata (Craniata) • Classes: –Agnatha — jawless fishes –Chondrichthyes — cartilaginous fishes –Osteichthyes — bony fishes –Amphibia –Reptilia –Aves — birds –Mammalia Chordate Systematics clades TET classes Both systems have valid uses
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This note was uploaded on 09/02/2011 for the course BIOL 6a taught by Professor Staff during the Fall '10 term at DeAnza College.

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G.Chordata - Phylum Chordata E m b r y o n ic d e v e lo p...

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