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Unformatted text preview: 2) Chondrichthyes 3) Acanthodii Osteichthyes – Well ossified internal skeletons, thin bony scales, paired lungs or swim bladder Actinopterygii – Ray finned fish, Single dorsal fin, Huge radiation in the Devonian and Silurian Chondrostei – sturgeons Neopterygii: 1) Bowfins and gars 2) Teleosts: most extant fish that aren’t sharks; make up half of all vertebrate species Sarcopterygii – muscular fins Monobasic fin - Contains stylopod: the humerus or femur 2 dorsal fins 1. Coelocanth 2. Lungfish 3. Tetrapods III. Summary of major clades: Synapomorphies Craniata – Chordates with braincase Vertebrata – Craniates with a backbone. Gnathostomata – Vertebrates with jaws Chondrichthyes – Gnathostomes with loss of bone in skeleton Osteichthyes – Gnathostomes with bony internal and external skeletons Sarcopterygii – Osteichthyans with muscular lobe fins Actinopterygii – Osteichthyans with bony, rayed fins...
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This note was uploaded on 09/08/2008 for the course BIOL 276 taught by Professor Johnson during the Spring '07 term at UNC.
- Spring '07