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The Timeline of Vertebrate Evolution
3
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The Timeline of Vertebrate Evolution
The first vertebrates, >500 million years ago (Ma)
Jellyfish have existed since at least this time.
backbones, gills, and a central nervous system.
characteristic of Sub phylum
The embryonic not chord persists in adult
characteristics of Class Agnatha
https://www.youtube.com/watch?v=drQiMZeYtPU
Examples of extant species with images/videos
Agnatha.
The first jawed vertebrates, ~400 Ma
group has been expanded. The precise relationships among all the Sarcopterygii are still a matter of debate, and there are many competing hypotheses.
Topic
fins formed jointed wrists
The first terrestrial vertebrates, ~370 Ma
cold-blooded
The amniotic egg was an evolutionary invention that allowed the first reptiles to dry land more than 300 million years ago.
The first reptiles, ~310 Ma
when dinosaurs dominated the Earth
Why is the Mesozoic Era commonly referred to as the “Age of Reptiles
What are the possible causes of the extinction of the dinosaurs?
it could be volcanic activity
The Cretaceous-Tertiary Extinction Event, ~66 Ma
mammals dominated the Earth because they are the big gest animal.
How did this extinction lead to the “Age of Mammals”
the Age of Mammals, ~66 Ma to present day
it all start when Cretaceous–Paleogene extinction when an asteroid hit the Earth.
The presence of hair or fur.
Sweat glands.
Glands specialized to produce milk, known as mammary glands.
Three middle ear bones.
A neocortex region in the brain, which specializes in seeing and hearing.
Specialized teeth.
A four-chambered heart.
What are the defining characteristics of mammals?
What are the defining characteristics of primates?
brains are larger than those of most other mammals
The first primates, ~55 Ma
it look like a squrele and fox
respod Description and photo of Plesiadapiforms
What are the defining characteristics of hominids?
Hominids are bipedalism and big brains and the fist human spices
. The evolution of hominids, ~4 Ma,
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