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Reptilia – “creepy crawly” . Examples: snakes, lizards, crocodiles, turtles. Traits. Dry, scaly skin. Traits. ectotherms. Traits. Well developed lungs. Traits. 3 chambered heart with partially divided ventricle. Traits. Muscular bony legs to the sides, if any at all. Traits.

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Reptilia creepy crawly
Reptilia – “creepy crawly”

  • Examples: snakes, lizards, crocodiles, turtles


Traits
Traits

  • Dry, scaly skin


Traits1
Traits

  • ectotherms


Traits2
Traits

  • Well developed lungs


Traits3
Traits

  • 3 chambered heart with partially divided ventricle


Traits4
Traits

  • Muscular bony legs to the sides, if any at all


Traits5
Traits

  • Toes with claws


Traits6
Traits

  • Internal fertilization


Traits7
Traits

  • Lay amniotic eggs on land

Amphibian egg

Reptile egg


Reptilian heart
Reptilian heart

  • Good pressure, partially divided ventricle keeps blood from mixing as much


Reptilian adaptations for land life
Reptilian adaptations for land life

  • To avoid dehydration – waterproof skin, colon absorbs water from feces, low respiration rate loses less water

  • Reproduction – internal fertilization, amniotic egg


Copulation
Copulation

  • Process of internal fertilization, male inserts sperm into the female system


Amniotic egg
Amniotic egg

  • Overcame the last obstacle to life on land


Amnion
Amnion

  • provides a water environment for the developing embryo

embryo

amnion


Albumen
Albumen

  • Provides protein for building materials (white)

albumen

embryo


Yolk sac
Yolk sac

  • Provides food energy

yolk sac

embryo


Shell and chorion
Shell and Chorion

  • Protects and waterproofs

shell

chorion

embryo


Allantois
Allantois

  • Collects wastes, acts as a respiratory surface

allantoise

embryo


Orders of reptiles
Orders of Reptiles

Squamata

Testudinata

Crocodilia

Rhynchocephalia


Squamata
Squamata

  • Largest order of reptiles

  • E.g. – snakes and lizards


Testudinata
Testudinata

  • Turtles and tortoises

How do you tell them apart?


Turtles
Turtles

  • live mostly in water, flatter shell, fast


Tortoises
Tortoises

  • live on land, rounded shell, slow




Crocodilia
Crocodilia

  • Crocodilesand alligators


  • Crocodiles

  • narrow head

  • pointed snout

  • teeth visible on top

  • and bottom

Alligators

  • broad head

  • rounded snout

  • teeth not as visible on bottom






Rhynchocephalia
Rhynchocephalia

  • Tuatara

3 rows of teeth (2 on top and 1 on bottom) and a light sensitive gland on its forehead that looks like a third eye


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