Canada > Ontario > Mississauga : Ancestor's Trail Hike  
by vegvet


The way points of this running / walking route:

Erindale Park @ 8:00am

Dawn of multicellular animal life approximately one billion years ago.

Choanoflagellates - 8:30am

The choanoflagellates are a group of free-living unicellular and colonial flagellate eukaryotes considered to be the closest living relatives of the animals. As the name suggests, choanoflagellates (collared flagellates) have a distinctive cell morphology characterized by an ovoid or spherical cell body 3–10 µm in diameter with a single apical flagellum surrounded by a collar of 30–40 microvilli.


Sponges - 8:45am

800 mya we had a common ancestor with sponges and other members of the phylum Porifera

Placozoans join 780mya @ 9:00am - Burhamthorpe Rd

Trichoplax adhaerens is a tiny seawater organism that lacks any organs and has only five types of cells, giving it the appearance of an amoeba.


Sponges (Porifera)




Acoelomorphs join @ 9:30am - Wellesborough Place

Flatworms join 630mya

Creditpointe Dr. Proto/Deuterostomes @ 9:45am

Protosomes & Deuterosomes diverge 590mya




Jawless fish join @ 10:00am - Eglinton Road

Concestor of Lamprey and Hagfish exist around 530mya


Sharks & Rays join @ 10:15am - 460mya - Portico Church (WR)

Here we find a common concestor that is ancestor to all gnathostomes, animals with lower jaws, a structure which evolved from the gill arches.


Ray finned fish join @ 10:30am - Barbertown x Mississauga Rd.

Fish, eels, mudskippers and sea-horses appear around 440mya having survived the first major extinction of the Ordovician-Silurian transition around 450mya




Lungfish join @ 10:45am - Reid Dr.

Lobe finned air breathing bony aquatic fish make an appearance around 417mya

400MYA 2nd Major Extinction - Old Station Rd.

Starts 375mya and lasts 15-20my to 360mya where upto 70% of all species died out.


Amphibians join @ 11:00am - Vic Johnson Arena (WR)

Frogs, salamanders and caecilians appear around 340mya. These will give rise to all terrestrial vertebrates.


Sauropsids join 310mya @ 11:15am

The concestor of all reptiles (including turtles, lizards, snakes and dinosaurs) and the precursor of birds evolve.

3rd Major Extinction

Permian-Triassic starts 251mya and ends 205mya allowing the dinosaurs to thrive exploiting almost all ecological niches.


230mya - Triassiac

Dinosaurs evolve and compete with other large amphibians for terrestrial spaces.

4th Major Extinction - Rivergrove CC (WR)

Triassic-Jurassic extinction 205mya


Monotremes join @ 11:40am

Echidna and platypus are the surviving descendents of concestors that evolved 180mya that were first to develop a NeoCortex in their brains.

Marsupials join @12:00pm - Britannia

Kangaroos, wallabies, sugar gliders, opposums and marsupial moles evolve 140mya

Laurasiatheres join at 12:15n

The concestor of this extremely diverse group of mammals evolves 85mya but the various genera are still confined to disparate ecological niches due to the overpowering dominance of the dinosaurs.

5th Great Extinction

Extinction of the dinosaurs 65mya

END: 7 billion Humans @ 12:30p - Pinecliff Dr. Park

Current time, the earth has been completely over-run by humans, who, by their activities , are changing the climate which threatens all life on earth which cannot evolve to accommodate these changes.

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