BIO 1130 Lecture Notes - Lecture 3: Aquatic Feeding Mechanisms, Pinacoderm, Nephridium

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8 Feb 2016
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Phanerozoic – Paleozoic Era November 6
2015
Extremely important point in time
oDiversity of planet found
oOrigins of multicellular life/ organisms
Paleozoic Era
oCambrian
oOrdovician
oSilurian
oDevonian
oCarboniferous
oPermian
Origins of invertebrates and plants
Ends with Permian
o95% of biological diversity gets wiped out
oAll starts over again
oOne of the greatest wipe outs in the history of
biology
Equator
oMaximal solar input
oMoving across the poles biodiversity decreases
Laurentia
oRock
oHuge continental plate
oFirst multicellular animals arose here
Weirdest animals lived in these oceans
oCambrian biota/ Cambrian animals
oNo longer on planet
oHuge array of organisms
oBurgess shales – Yoho National Park in BC
Fossils of unusual invertebrates
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Soft bodied animals
Story of completing invertebrate fossils
Mud slides below water where there was no
oxygen and organisms would die and get crest
together in shales
You see animals that lived there
You can dissect them and 4nd out what
they have they been eating
Arthropods of some type
Beginning of Cambrian
Unlimited set of array of animals
Huge experiments of body limbs and types
Huge discovery
The Cambrian Explosion
Paleozoic Era November 11,
2015
Big 4nding from fossils
oHuge array of unusual organisms never seen other
than the Cambrian explosion.
oArthropods make an appearance
Invertebrates
oVery beginning the common ancestor is the
choanocyte
Cell body
Uniconts ;agellum
Food will stick and get consumed
Common cell for fungi and Animalia
Indicates that they are linked together
Behave cooperatively
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Head towards multicellularity
Cladogram for Animalia
oAutapomorphies at the bottom
Multicellular eukaryotes
Ingestive heterotrophs
Cells with di<erent functions
Other than reproduction
Choanocytes
Collagen
Adhesion
Cells stick together
Universal glue for all the organisms to
come
Animal Architecture
oTissues
How many make a body of an organism
Intercellular communication
None, diploblastic or triploblastic
Di<erence between diplo and triplo
oExcoder, interderm and mesoderm
Muscles are made of mesoderm
Symmetry abd cephalization
Asymmetry, radial and bilateral symmetry
Embryology
Protostome and deuterostome
Body cavities
Coelomate, pseudocoelomate, acoelomate
Porifera (sponges)
oTop of Cladogram
oStill use choanocytes in an aquiferous (water)
system)
oCells but no tissues
oVery early stage of animal evolution
oNO cell communication
oAsymmetric body plan
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