Presentation on theme: "History of Life Part 3. Proterozoic Eon 2.5 bya – 543 mya stable continents first appear Most life are Bacteria and Archaeans first evidence of oxygen."— Presentation transcript:
History of Life Part 3
Proterozoic Eon 2.5 bya – 543 mya stable continents first appear Most life are Bacteria and Archaeans first evidence of oxygen build-up in the atmosphere This global catastrophe spelled doom for many bacterial groups & made possible the explosion of eukaryotic forms.
Endosymbiosis What does it mean? The rise of Eukarya 1.8 bya Endo = within sym = together biosis = life Endosymbiosis = organisms of a different species living together, with one of the organisms living within the other Symbiosis between different species of eubacteria & between archeabacteria and eubacteria
Prokaryotes lead to Eukaryotes
Endosymbiosis Increases Organism Complexity
Croanoflagelado: -last unicellular ancestor of all eukaryotes -Characteristics similar to modern protista
800 mya: 1st-multicellular organism Sphaeroeca, a colony of choanoflagellates ~230 individuals cooperatively linked protists
850 MYA First Fungi the fossil on right are fungal filaments resemble living filaments of common Candida species. the fossil at right has preserved the perithecium with spores used for reproduction. Amber fossils
760 MYA-First Animal Otavia antiqua -a sea spongue
Typical day in a late PreCambrian sea…
Trilobites : the 1 st exoskeletons.
Finally the ocean is full of animals with hard parts… by the early Paleozoic there are lots of animals that can form fossils. Cambrian Explosion: ~570mya- 500mya
Cambrian Explosion : A sudden explosion of complex, multicellular life at the beginning of the Paleozoic Many of these early animals looked very strange, unlike any animals we find on Earth today.
Opibinia … 1 st macroscopic predator
Most of the major phyla originated over several million years during the early Paleozoic…
520 mya Pikaia: 1 st Chordate
Typical day in late PreCambrian sea…
Jawless Fish Earliest Fish 500 mya
Lobed Finned Fish
Plants Move Onto Land
480 MYA- First Land Plant The cryptospores are the oldest land plant fossils found. Petrified fossils