Biol276-Evo of Vert Life- Spring 2008-Fishes

Biol276-Evo of Vert Life- Spring 2008-Fishes - 2)...

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Diversity of Fishes outline I. Earth History from Origin of Multicellular through the “age of fishes” Age of Earth: 4.6 billion years Precambrian Era Paleozoic Era: Cambrian: Myllokunmingia and Haikouichthys Ordovician: Fossilized vertebrates are abundant Silurian: Diversification of fishes Devonian: "The Age of Fishes" Carboniferous: Rise of Tetrapods Permian: Diversification of modern fish (neopterygii) Mesozoic Era: "Age of Reptiles" Cenozoic Era: "Age of Mammals" MAJOR radiation of the Teleost fishes II. Paleozoic fish Craniata = Hagfish and Craniates Important note: Pharyngeal slits = gill slits, since the arches of tissue between slits contain gills. Vertebrata Important synapomorphies include: 2 pairs of vertical semicircular ducts Vertebrae Fossils occur in marine and freshwater deposits 1) Lampreys 2) Heterostracans 3) Osteostracans Gnathostomata Important synapomorphies include: Jaws gill slits (5-6) Paired Nostrils 3 rd pair of semicircular ducts First fossils are from freshwater deposits 1) Placoderms
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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 arent 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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Biol276-Evo of Vert Life- Spring 2008-Fishes - 2)...

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