primate evolution timeline part 2 (4)

What are euprimates?

First true primates

What type of vision do euprimates have?

Stereoscopic (3D) vision from forward-facing eyes

Why are forward-facing eyes important in euprimates?

They provide depth perception for arboreal movement

What kind of hands and feet do euprimates have?

Grasping hands and feet with nails instead of claws

What is a postorbital bar?

A bony ring around the eye socket found in euprimates

How does brain size in euprimates compare to earlier mammals?

Larger and more complex

Do euprimates rely more on vision or smell?

Vision over smell

What are plesiadapiforms?

Primate-like mammals that lived before euprimates

Did plesiadapiforms have forward-facing eyes?

No, their eyes were more side-facing

What type of digits did plesiadapiforms have?

Claws instead of nails

Did plesiadapiforms have a postorbital bar?

No, they lacked a complete postorbital bar

How does brain size in plesiadapiforms compare to euprimates?

Smaller and less complex

Did plesiadapiforms rely more on vision or smell?

Smell over vision

Key difference in eye position between euprimates and plesiadapiforms?

Euprimates have forward-facing eyes; plesiadapiforms have side-facing eyes

Nails vs claws—who has what?

Euprimates have nails; plesiadapiforms have claws

Which group has a postorbital bar?

Euprimates only

Which group is more visually adapted?

Euprimates

Which group came first evolutionarily?

Plesiadapiforms