Reptiles. Key features of Reptiles. Strong, bony skeletons and toes with claws Two pairs of limbs, except snakes Legs positioned vertically for support of body and movement on land. External Structural Adaptations for Land.
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Regulate their temp by behavior
have a ventricle that is totally separated into two pumping chambers
Double loop circulation
before hatching or hatching
may occur inside her body
structural adaptations common to other carnivores
is carapace and
ventral is plastron
Order composed of 20 species of large lizard-shaped reptiles- crocodiles, alligators, caimans and gavials
Crocodilians live in or near water in tropical/ subtropical regions of the world
Crocodiles-nocturnal animals; Africa, Asia and Americas
Alligators-China and southern U.S.
Caimans-Central America, some in FloridaCrocodilian
Limited competition for the insects and plants that could be used as food on the land
An increase in competition for food and space among all the life-forms in aquatic environments310 million years ago… reptiles were the first vertebrates to make the complete transition to life on land
Allantois used as food on the land stores the nitrogenous wastes produced by the embryo until the egg hatches
An egg with a protective membrane and a porous shell enclosing the developing embryo
Egg forms a “nursery” to protect the embryo
Egg derives its name from the amnion, the thin membrane enclosing the salty fluid in which the embryo floats
Yolk sac encloses the yolk, a protein rich food supply for the developing embryoAmniotic Egg
The End dioxide