March 2 Vertebrates Fish and Amphibians 2009

March 2 Vertebrates Fish and Amphibians 2009 - Introduction...

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Introduction to Vertebrate classes Some words you should know Apomorphy: A derived or specialized character. Pleisiomorphy: An ancestral or ‘primitive’ character. Synapomorphy: An apomorphy (derived or specialized character) shared by two or more groups which originated in their last common ancestor. Symplesiomorphy: A character shared by a number of groups, but inherited from ancestors older than the last common ancestor. Monophyletic: A group where all of whose members share a common ancestor Polyphyletic: A group that does not contain the most recent common ancestor of its members Paraphyletic: A monophyletic group from which one or more of the clades is excluded to form a separate group (ex. reptiles and birds). KEY FEATURES Chordates Notochord Dorsal Hollow Nerve Chord Pharyngeal Slits Post-anal tail Craniates Neural Crest Fate of Neural crest cells Two (at least) chambered heart Vertebrates Backbone Gnathostomes Hinged Jaws Dual nostrils 3 semicircular canals Paired pelvic fins “fish” groups Chondrichthyes In the bony groups Actinopterygii (ray finned fishes) Acinistia Lobe finned fishes Dipnoi Lungfishes
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“fish” groups Chondrichthyes In the bony groups Actinopterygii (ray finned fishes)
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This note was uploaded on 09/28/2009 for the course BIOL 172 taught by Professor Staff during the Spring '08 term at Hawaii.

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March 2 Vertebrates Fish and Amphibians 2009 - Introduction...

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