Class Reptilia

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Class Reptilia

• Aka reptiles

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General Characteristics

• Evolved from amphibians and most dominant on land
• Cold blooded ectothermic
• Activity is regulated by the temperature of the
  environment
• Restricted from cold water for this reason
• All members have lungs instead of gills
• All members have leathery skin and scales
• This class included the dinosaurs

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Sea Turtles

• Bodies are enclosed in a carapace shell
• Cannot retract their head into the shell
• Forelimbs are modified into flippers
• Only 9 species exist
• Lack teeth but have strong jaws for biting
• Females come up onto the beach at night to lay
  eggs in the sand
• Babies hatch and return to the sea
• Turtles are thought to return to same beach they
  were born on to lay their own eggs

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Sea Snakes

• Found mostly in the tropical waters of the Indian
  and Pacific oceans
• Bodies are laterally flattened and tail is
  adapted into a paddle
• Range in size between 3 and 4 feet
• They are ovoviviparous which means eggs are
  internally fertilized and baby hatches inside the
  mother
• All are carnivorous
• Very venomous

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Marine Iquana

• Found only in the galapagos island
• Spend most of its time basking in the sun on the
  rocks
• Enters the water to feed on algae
• Can dive as deep as 33 ft

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Salt Water Crocodile

• Live in estuaries
• Located mostly in coastal water but have been
  seen in the open ocean
• Average size is 20 ft
• The most aggressive animals in the water
• Have been known to eat humans

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Respiration and Circulation

• All respiration is done using lungs
• Marine reptiles must come to the surface in order
  to breath
• Lungs resemble ours in terms of shape and
  function
• 3 chamber heart the ventricle is not completely
  separated
• Exception is the crocodile that has 4 chambers

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Reproduction

• All reptiles have internal fertilization
• Most lay leathery eggs
• Scientific term for this is oviparous
• Some have the same eggs held within the mother
  until it hatches
• Scientific term is ovoviviparous
• The food for the embryo comes from the yolk (the
  yellow stuff in the eggs you eat)

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The rest of the Anatomy

• Is the same as your anatomy