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Reptile Evolution. Origin of derivatives. Ancestral reptile = anapsid , small, legs out to sides. A brief look at Classification. “Old view” = Amphibians give rise to reptiles, reptiles give rise to birds and mammals phyletic patterns.

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reptile evolution

Reptile Evolution

Origin of derivatives

slide3
A brief look at Classification

“Old view” = Amphibians give rise to reptiles, reptiles give rise to birds and mammals

phyletic patterns.

slide5
New View of Taxonomy = Cladistics common derived characteristics
  • Problem with reptiles = heart structure.
  • fossil reptiles that give rise to mammals appear early in
  • reptile history and leave no descendents
  • modern reptiles heart structure is different from mammal structure, so cant derive modern mammals from modern reptiles.
  • so in Cladistics, kick mammal ancestors out of the reptiles
  • (if it looks like a lizard, it is a lizard???)
slide8
Living anapsids = chelonia, the turtles

Shoulder girdle inside shell, which is ribs and vertebrae!!

slide9
Skull is anapsid = no hole

But has a notch at back which serves the same purpose, accommodate the jaw muscles.

slide11
Ichthyosaurs: fully aquatic, but air breathing. A reptile equivalent to whales or porpoises. Mostly fish eating.
slide17
Start out diapsid (two holes behind the eye

In snakes, one opening, and extra hinges in jaw.

slide18
Archosaurs = major dinosaur groups

Plus crocodiles, and bird ancestry.

slide25
Allometry: changes in proportion with growth.

Means young often considered different species from adults.

slide31
Stegosaurus; plate back

Functions:?

courtship

thermoregulation?

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