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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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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 Filter feeding & gas exchange 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 Myomeres & vertebrae 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: Cranium & vertebral column Vertebra
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2 Axial & appendicular skeleton of 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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