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Part 8. Diapsida. Non-Avian Reptiles. Diapsida (living). Parareptiles. Turtles. Crocodilians. Reptiles. Pterosaurs. Archosaurs. Ornithischian dinosaurs. Dinosaurs. Saurischian dinosaurs other than birds. Diapsids. Saurischians. Birds. Plesiosaurs. ANCESTRAL AMNIOTE.

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Part 8

Diapsida

Non-Avian Reptiles


Diapsida (living)


Parareptiles

Turtles

Crocodilians

Reptiles

Pterosaurs

Archosaurs

Ornithischian

dinosaurs

Dinosaurs

Saurischian

dinosaurs other

than birds

Diapsids

Saurischians

Birds

Plesiosaurs

ANCESTRAL

AMNIOTE

Ichthyosaurs

Tuataras

Lepidosaurs

Squamates

Diapsida (all)


Diapsida (all)



Mesozoic

Age of Reptiles (diapsids)


Diapsid Diversity (all)


Diapsid Diversity (living)


Diapsida

Turtles

Lepidosaurs

Archosaurs

†Other



Diapsida(living)

Turtles


Turtles

Order Testudines (Chelonia)


Turtles

Diapsida (living)


Triassic Turtle – 220 mya

Odontochelys


What’s unique about the turtle line?

Loss of temporal fossae

Primitive Diapsid

Fossil turtle

Anapsid condition


What’s unique about the turtle line?

Shell derived from dermal bone


What’s unique about the turtle line?

Shell derived from dermal bone


What’s unique about the turtle line?

Shell derived from dermal bone


What’s unique about the turtle line?

Loss of teeth (living forms)











Pets

Trachemys scripta elegans



A Ventura County Native

Actinemysmarmorata


Diapsida(living)

Lepidosaurs




Lepidosaurs

Diapsida (living)


What’s unique about lepidosaurs?

Transverse cloaca


What’s unique about lepidosaurs?

skin shed in one piece


Lizards and Snakes

Order Squamata


Squamata

Diapsida (living)


Order Squamata

Lizards and Snakes

Is it really this simple?


Order Squamata

two living lineages

Snakes, monitors

True lizards


What is unique about Squamates?

Hemipeneson males





Australia

Convergent Evolution

Moloch

N. America

Phrynosoma


PhrynosomaHatchling


Ophisaurus

“Glass snakes”


Ophisaurus

regenerated tail



Heloderma

Lizard or snake relative?


CI Natives

Elgaria multicarinata webbii


CI Natives

Sceloporus occidentalis longipes


CI Natives

Utastansburiana


Squamata(Serpentes and relatives)

Diapsida (living)


Monitor “lizards”

Snake relatives









Hearing

columella


Pit organ

pit viper




Copperhead

Agkistrodon contortrix



Newborns

baby snakes are cute




Texas rattlesnake round up

Texas wildlife abuse



CI Natives

Pituophiscateniferannectens


CI Natives

Crotalus oreganus helleri


Lepidosauria– tuataras

Diapsida (living)


Tuatara

Sphenodon spp.





Island refuges allow mainland recovery

2009




Archosaurs- living

Diapsida (living)


What’s unique about archosaurs?

inverted triangular orbit

antorbital fenestra

mandibular fenestra

Muscular gizzard





Archosaurs(living)









Diapsidskull

orbit







Aves

Birds




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