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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

Post-Paleozoic is the age of amniotes


Diapsida

Mesozoic

Age of Reptiles (diapsids)


Diapsida

Diapsid Diversity (all)


Diapsida

Diapsid Diversity (living)


Diapsida

Diapsida

Turtles

Lepidosaurs

Archosaurs

†Other


Diapsida

Diapsida


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

Triassic turtles


Diapsida

Diversity and random bits of biology


Diapsida

Sea turtles


Diapsida

Freshwater turtles


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Land Tortoises


Diapsida

Endothermy?


Diapsida

Social and courtship behaviors


Diapsida

Reproduction


Diapsida

Migrations


Diapsida

Pets

Trachemys scripta elegans


Diapsida

Conservation


Diapsida

A Ventura County Native

Actinemysmarmorata


Diapsida

Diapsida(living)

Lepidosaurs


Diapsida

Lepidosaurs


Diapsida

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

Kinetic Skull


Diapsida

Suborder Sauria

lizards


Diapsida

Tail regeneration


Diapsida

Australia

Convergent Evolution

Moloch

N. America

Phrynosoma


Diapsida

PhrynosomaHatchling


Diapsida

Ophisaurus

“Glass snakes”


Diapsida

Ophisaurus

regenerated tail


Diapsida

Amphisbaenians


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

Also possibly not true lizards, but on the snake lineage

Heloderma

Gila monsters


Diapsida

Suborder Serpentes


Diapsida

Extreme specialization towards creeping


Diapsida

Hind limbs on a primitive snake


Diapsida

Lizards have eye lids and ear drums


Diapsida

Snakes don’t


Diapsida

Very flexible (kinetic) skull


Diapsida

Hearing

columella


Diapsida

Pit organ

pit viper


Diapsida

Jacobson’s Organ


Diapsida

Venomous Snakes

Vipers


Diapsida

Copperhead

Agkistrodon contortrix


Diapsida

Some snakes are ovoviviparous


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Newborns

baby snakes are cute


Diapsida

Humans and snakes


Diapsida

Texas rattlesnake round up


Diapsida

Texas rattlesnake round up

Texas wildlife abuse


Diapsida

Hibernaculum


Diapsida

CI Natives

Pituophiscateniferannectens


Diapsida

CI Natives

Crotalus oreganus helleri


Diapsida

Lepidosauria– tuataras

Diapsida (living)


Diapsida

Tuatara

Sphenodon spp.


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Research and Conservation


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Island refuges


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Captive breeding


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Island refuges allow mainland recovery

2009


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Pineal eye


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(relatively) unmodified diapsid skull


Diapsida

Archosaurs- living

Diapsida (living)


Diapsida

What’s unique about archosaurs?

inverted triangular orbit

antorbital fenestra

mandibular fenestra

Muscular gizzard


Diapsida

Archosaurs


Diapsida

Archosaurs


Diapsida

Archosaurs(all)


Diapsida

Archosaurs(living)


Diapsida

Living Archosaurs


Diapsida

Crocodilians


Diapsida

Crocodilia


Diapsida

Crocodiles


Diapsida

Alligators


Diapsida

Caimans


Diapsida

Gharial


Diapsida

Diapsidskull

orbit


Diapsida

Negative Pressure breathers


Diapsida

Alligator nest


Diapsida

Alligator hatchlings are adorable


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Maternal care


Diapsida

Archosaurs - Birds


Diapsida

Aves

Birds


Diapsida

Amniota - Synapsida


Diapsida

Synapsida


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