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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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Diapsida

Part 8

Diapsida

Non-Avian Reptiles


Diapsida

Diapsida (living)


Diapsida

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

Diapsida (all)



Diapsida

Mesozoic

Age of Reptiles (diapsids)


Diapsida

Diapsid Diversity (all)


Diapsida

Diapsid Diversity (living)


Diapsida

Diapsida

Turtles

Lepidosaurs

Archosaurs

†Other



Diapsida

Diapsida(living)

Turtles


Diapsida

Turtles

Order Testudines (Chelonia)


Diapsida

Turtles

Diapsida (living)


Diapsida

Triassic Turtle – 220 mya

Odontochelys


Diapsida

What’s unique about the turtle line?

Loss of temporal fossae

Primitive Diapsid

Fossil turtle

Anapsid condition


Diapsida

What’s unique about the turtle line?

Shell derived from dermal bone


Diapsida

What’s unique about the turtle line?

Shell derived from dermal bone


Diapsida

What’s unique about the turtle line?

Shell derived from dermal bone


Diapsida

What’s unique about the turtle line?

Loss of teeth (living forms)











Diapsida

Pets

Trachemys scripta elegans



Diapsida

A Ventura County Native

Actinemysmarmorata


Diapsida

Diapsida(living)

Lepidosaurs




Diapsida

Lepidosaurs

Diapsida (living)


Diapsida

What’s unique about lepidosaurs?

Transverse cloaca


Diapsida

What’s unique about lepidosaurs?

skin shed in one piece


Diapsida

Lizards and Snakes

Order Squamata


Diapsida

Squamata

Diapsida (living)


Diapsida

Order Squamata

Lizards and Snakes

Is it really this simple?


Diapsida

Order Squamata

two living lineages

Snakes, monitors

True lizards


Diapsida

What is unique about Squamates?

Hemipeneson males





Diapsida

Australia

Convergent Evolution

Moloch

N. America

Phrynosoma


Diapsida

PhrynosomaHatchling


Diapsida

Ophisaurus

“Glass snakes”


Diapsida

Ophisaurus

regenerated tail



Diapsida

Heloderma

Lizard or snake relative?


Diapsida

CI Natives

Elgaria multicarinata webbii


Diapsida

CI Natives

Sceloporus occidentalis longipes


Diapsida

CI Natives

Utastansburiana


Diapsida

Squamata(Serpentes and relatives)

Diapsida (living)


Diapsida

Monitor “lizards”

Snake relatives









Diapsida

Hearing

columella


Diapsida

Pit organ

pit viper




Diapsida

Copperhead

Agkistrodon contortrix



Diapsida

Newborns

baby snakes are cute




Diapsida

Texas rattlesnake round up

Texas wildlife abuse



Diapsida

CI Natives

Pituophiscateniferannectens


Diapsida

CI Natives

Crotalus oreganus helleri


Diapsida

Lepidosauria– tuataras

Diapsida (living)


Diapsida

Tuatara

Sphenodon spp.





Diapsida

Island refuges allow mainland recovery

2009




Diapsida

Archosaurs- living

Diapsida (living)


Diapsida

What’s unique about archosaurs?

inverted triangular orbit

antorbital fenestra

mandibular fenestra

Muscular gizzard





Diapsida

Archosaurs(living)









Diapsida

Diapsidskull

orbit







Diapsida

Aves

Birds




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