BI 215 3-7-11-Human_evolution-EduCat

BI 215 3-7-11-Human_evolution-EduCat - Precambrian Life...

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Precambrian Life Prokaryotes Cyanobacteria No O2 early For 2 BY, it was all  bacteria, all the time
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Precambrian Life Prokaryotes Cyanobacteria No O2 early For 2 BY, it was all  bacteria, all the time
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Precambrian Life Prokaryotes Cyanobacteria No O2 early For 2 BY, it was all  bacteria, all the time 2.7 Bya some  eukaryotes (fossils  1.5 Bya)
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Precambrian Life Eukaryotes Nucleus, cytoskeleton Internal compartments chloroplasts/mitochondria
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Precambrian Life Eukaryotes  Nucleus, cytoskeleton  Internal compartments  Chloroplasts/mitochondria Chloroplasts from cyanobacteria Mitochondria from purple bacteria First eukaryotes 2.7 bya (?)
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Precambrian Life Eukaryotes  Nucleus, cytoskeleton  Internal compartments  Chloroplasts/mitochondria  Many more than traditional 5 kingdoms  Protoerozoic life – multicellular! First multicellular – 575 Mya Ediacaran Fauna
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Paleozoic: Cambrian About 10 MY of stasis, then  BOOM All major animal phyla Brachiopods, trilobites, arthropods,  molluscs, echinoderms Agnathan vertebrates Conodonts Why the sudden arrival DNA says 1000 Mya Maybe too soft…
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Figure 5.9  A scene on the  Cambrian sea floor
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Figure 5.9  A scene on the  Cambrian sea floor
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Paleozoic:  Cambrian Where do we fit in? Choanoflagellates
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Paleozoic: Cambrian Where do we fit in? Choanoflagellates Porifera (sponges)
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Paleozoic: Cambrian Where do we fit in? Choanoflagellates Porifera (sponges) Cnidarians & Ctenophores
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Paleozoic: Cambrian Where do we fit in? Choanoflagellates Porifera (sponges) Cnidarians & Ctenophores Bilateria Deuterostomes Protostomes
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Paleozoic: Cambrian Where do we fit in? Choanoflagellates Porifera (sponges) Cnidarians & Ctenophores Bilateria Deuterostomes Protostomes
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Paleozoic: Ordovician Marine life Most were epifaunal Starfishes and nautiloids Big reefs Ended with giant extinction Agnathans flourished Joined by gnathostomes Sarcoptertgii appeared Haikouicthys
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Paleozoic: Ordovician Ordivician terrestrial life Mosses, liverworts,  tracheophytes are monophyletic
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Paleozoic: Ordovician Ordivician terrestrial life By Silurian, small vascular  plants Earliest arthropods Chelicerates Mandibulates And Ichthyostegids!!
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Tetrapod Evolution
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Ray-finned fishes Sarcopterygian  fishes Tree of Life http://tolweb.org/tree/
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Sarcopterygii Lungfishes, coelacanths,  rhipidistrians Osteolepiformes Fleshy paired fins with large  bones Basal fin bones articulated  with girdles Lungs Diverse in fresh water
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Sarcopterygii Lungfishes, coelacanths,  rhipidistrians Osteolepiformes
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This note was uploaded on 02/12/2012 for the course BI 215 taught by Professor Teeter during the Fall '10 term at Northern Michigan University.

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BI 215 3-7-11-Human_evolution-EduCat - Precambrian Life...

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