Reptilia – “creepy crawly”
description
Transcript of Reptilia – “creepy crawly”
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
• Toes with claws
Traits
• Internal fertilization
Traits
• Lay amniotic eggs on land
Reptile egg
Amphibian egg
Reptilian heart
• Good pressure, partially divided ventricle keeps blood from mixing as much
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
• Process of internal fertilization, male inserts sperm into the female system
Amniotic egg
• Overcame the last obstacle to life on land
Amnion
• provides a water environment for the developing embryo
amnionembryo
Albumen
• Provides protein for building materials (white)
embryo
albumen
Yolk sac
• Provides food energy
embryo
yolk sac
Shell and Chorion
• Protects and waterproofs
embryo
shell
chorion
Allantois
• Collects wastes, acts as a respiratory surface
embryo
allantoise
Orders of Reptiles
Squamata Testudinata
Crocodilia Rhynchocephalia
Squamata
• Largest order of reptiles
• E.g. – snakes and lizards
Testudinata
• Turtles and tortoises
How do you tell them apart?
Turtles
• live mostly in water, flatter shell, fast
Tortoises
• live on land, rounded shell, slow
Turtle or Tortoise?
Turtle or Tortoise?
Crocodilia
• Crocodiles and alligators
Alligators• broad head • rounded snout • teeth not as visible on
bottom
Crocodiles• narrow head • pointed snout • teeth visible on top and bottom
Alligator or Crocodile?
Alligator or Crocodile?
Alligator or Crocodile?
Alligator or Crocodile?
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