Flashcards in Chapter 26: Reptiles Deck (12):
By late Carboniferous period the amniotes (those that lay amniotic eggs) had separated into what three groups?
- no temporal openings in the skull
- only seen in turtles today
- all other reptilian groups and birds have this skull
- two temporal openings
- include extinct reptiles such as dinosaurs and pleisosaurs
- mammals and extinct forms of mammals like reptiles
- single temporal opening
Differences from amphibians:
- tough, dry skin offering protection from desiccation and injury
-Amniotic egg breaks all ties with water
- stronger jaws for crushing and gripping (jaw muscles larger and longer and better arranged for mechanical advantage)
- force is in closing not in opening
Fertilization is ?
In comparison to amphibians what is their circulatory system like?
- more efficient and higher bp
They have better adapted?
Ex of better water conservation strategies?
- metanephric kidney and excrete nitrogenous wastes as uric acid which helps conserve water
In terms of support how do they hold up to amphibians?
- better boy support and more efficient on land
NS in comparison to amphibians ?
- more complex
- skull has one occipital condyle
- 12 cranial nerves