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Lecture 7

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University of Ottawa

PhanerozoicPaleozoicthHadean 46003800Ma 012thrdArchanean 38002500 Ma 12 33 rdrdProterozic 2500543Ma 3363 Phanterozic 543 Ma to present time top 9 floorsthPaleozoic Era 550245 Ma 63th to 65thstMesozoic Era 24565Ma 65 to 71 Cenozoic Era 65 Ma to Present timePaleozoic PeriodsPaleozoic era Cambrian 550488 Ma Ordovician 488443 MaInvertebrate Live in the Water Going to see mulit cellularity in the oceans explode in the body plans Silurian 443416 Ma Devonian 416359 Ma Carboniferous 359299 Ma Permian 299245 MaLate Cambrian 514 MaContinental Land masses are moving out of the water As they move No growth on land just erosions and sediments Land masses have an effect on flow of the oceansEquator has arounded ideal place where it is the warmest and had the most sun it is also the global air patterns when the air rises and moister that rises comes back down and rains Consequences of this cycle as the air comes back down it is dried out there is no moister and dry air low productivity zone where we find desertsFairly productive Temperate zone stable livingDry air moister has been locked up in polesContinental Shelves are the equitant of the rainforest of the ocean they are shallow good light penetration and great productivity When a Continental shell sits on the Equator and became an ideal place going to be invertebrate Unusual Invertebrates The diversity of life exploded with these invertebrate Animals would fall off with the sediment falling but wont decompose and then more and more would fall over a huge period of time and fossilize so we have an idea of the biodiversity at the timeFirst found at the Burgess Shales Find very unusual InvertebratesWe know now that during this period the conditions were right for a huge array of biodiversity It was the beginning of multi cellular life for everything all the ones that made it and the ones that did notHistory of Invertebrates Burgess Shales Yoho National ParkEarly nineteen hundreds a Family found the fossils after there had been a land slide and they were in the way of the horse trail He got off his horse to move them so the horses would not trip It turned out he was the expert at the time so he knew what he was looking at When he found them and he said it is complete collection of the invertebrate in time and was not looked at again until 1980sAncestor to All Multicellular Life Colonial ChoanocyteVery special type of cellIt is a Unikont cellCreating a water current that it is going to feed onWith a collar which are Small Microvillia and a flagella in the middle that helps water pass through the collar and this is the site where they collect foodA colonial form meaning a group of organisms could pump more water than just one this meant that you were better nourished They come in stalk and mat form and they can still be seen todayAnimalia Autapomorphies This that define all the AnimalsMulticellular EukaryotesIngestive HeterotrophsCells with different functions division of laborChoanocytesCollagenLOOK AT PHYLA All Arise During the CambrianPorifera Autapomorphies Asymmetrical Body PlanCells but no tissueUse of choanocytes in an aquiferous system Pumping waterTotipotent cellsAnimal Architecture Ways to divide up the living world TissuesNone diploblastic or triploblasticSymmetry and cephalizationAsymmetry radial and bilateral symmetry
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