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Lecture

Jan 8-Origin of Animals.docx

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Department
Biology (Sci)
Course
BIOL 305
Professor
Virginie Millien
Semester
Winter

Description
01/08/2014 Origin of Animals “Under organized”( Porifera) vs. radial symmetrical (Cnideria) vs. bilateria Origin of Bilateria: Canada has the oldest rock and preserves the oldest animals (Mistaken Point, NL) and the  oldest bilaterian fossils (Burgess Shale, BC) Mistaken point: ­ Oldest animal fossils ­ Some are symmetrical and have 3 order fractal symmetry ­ Billings (?): the first animal fossil at Mistaken Point is now next to a parking lot ­ Comes after “Snowball Earth” ~550mya o When O  le2els have reached nearly 0 o Type of biotic “reset” for the planet ­ Ediacaran “animal” fossils o Eg. Rangeomorph: Have 3 order fractal symmetry o Rangeomorphs resemble extant Sea pen (colonial cniderian) o Evidence of molluscan and jellyfish­like organisms  Sedentary, though some evidence of forwards and backwards  movement o Deep water, chemosymbiosis, filter feeding, sedentary, soft bodied ­ Post­Ediacaran things completely changed = bioturbation o Bilateral animals: vermiform with some coelomic and contractile  movement o Some evidence of non­jellyfish/molluscan forms Burgess shale: ~505mya ­ Cambrian explosion: though somewhat of a misnomer o May just be first example of fossils, not actually diversity explosion ­ Hints of every clade of animal out there Examples of Burgess Shale: Thamaptilon: looks like a rangeomorph and one of the only non­bilaterian animals in  burgess Ottoia: Priapulid worm (Very similar to extant priapulid) Onychophora: Similar extant organisms have female hierarchies Canadaspis: first crustacean (correct number legs/antennae) Plus a whole slough of arthropods Marrella: Origin of trilobite Wiwaxia: mollusk (with correct tooth plates and everything) Odontogriphus om
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