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Chapter 41 Reptiles Characteristics of Reptiles Ectotherm thick, dry, scaly, waterproof skin (prevents animal from drying out or injury) 4 legs w/claws (claws used for digging, climbing, running) vary in size, shape, color live on every continent except Antarctica

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Chapter 41


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chapter 41

Chapter 41

Reptiles

characteristics of reptiles
Characteristics of Reptiles
  • Ectotherm
  • thick, dry, scaly, waterproof skin (prevents animal from drying out or injury)
  • 4 legs w/claws (claws used for digging, climbing, running)
  • vary in size, shape, color
  • live on every continent except Antarctica
slide3

Live in every ocean except the polar regions

  • breathe w/lungs
  • 3 chambered heart (lower chamber partially divided to keep oxygen rich blood from blood of the body)

Mmmm!!!

development of the amniotic egg
Development of the Amniotic Egg
  • Internal fertilization
  • complete environment for the embryo
  • egg has a leathery shell
  • hatch fully developed
  • Parts of the egg:
  • - Yolk: large food supply
  • - Amnion: filled w/fluid; shock absorber
  • - Allantois: gas exchange which then goes to the pores on the shell
modern reptiles 3 orders order turtles
Modern Reptiles (3 orders)Order Turtles
  • Can be found anywhere on earth that you find reptiles
  • body covered by a hard shells on top & bottom (carapace)
  • most can withdraw into the shell
  • no teeth; use beaks to break off food
  • omnivores (algae, fish, jellyfish)
order crocodilia
Long, slender snouts

aggressive

can attack large animals easily

Broad snouts

less aggressive

eat fish, turtles, water birds

Order Crocodilia

Crocodiles & Alligators

Gavial: found in India, eat fish, slender jaws w/more than 100 teeth

*all found in or near water in tropical climates

slide9

Order Lizards & Snakes

*these make up the largest group of reptiles

  • Lizards
  • movable eyelids
  • external ears
  • legs w/clawed toes
  • feed on reptiles, insects, spiders, worms, mammals
  • largest are the monitor lizards (Komodo Dragon)
slide10

Chameleon

Komodo Dragon

slide11

Snakes

  • no external ears; “hear” by vibrations rather than sound waves (vibrations are picked up by lower jawbone & conducted to bones in inner ear which carries message to brain)
  • Use tongue to smell things
slide12

unhinge their jaw & slide their mouth slowly over prey; teeth help hold prey in position

  • Constrictors: slowly suffocate their prey ex: boa, python, black rat snake
slide13

venom: kill w/venom (2 kinds)

  • - neurotoxin: paralyzes the nervous system, usually causes death in less than 20 minutes ex; cobra, coral snake
slide14

- hemotoxin: destroys blood cells, usually causes death in 48 hours or less ex; rattlesnake, cottonmouth, copperhead

maternal care in reptiles
Maternal Care in Reptiles
  • Most fish, amphibians, & reptiles do not provide care for their young
  • but alligators & crocodiles stay near the nest & guard the eggs; they often respond to sounds made during hatching, dig out the babies and carry them to water