Northwestern Alligator Lizard

Lizard a Reptile


Amphibian versus Reptile comparison chart
Amphibian Reptile
Introduction Amphibians mean living two lives (on land as well as on water). Amphibians usually have to stay near water sources to prevent drying out, and have smooth skin. Reptiles are groups of animals that breathe air, have scales on their bodies, and lay eggs.
Examples of animals
Method of Breathing Gills and lungs Lungs
Body Metabolism Ectothermic (cold-blooded) Ectothermic (cold-Blooded)
Metamorphosis Yes. Breathes water through gills until it develops lungs. No. Looks like a miniature adult when born.
Defense Toxic skin secretions and can bite. No nails. If teeth are present, they are pedicellate teeth. Nails and teeth (some have venom; Gila monster, beaded lizard, and many snakes). Reptiles have scales, which act as a sort of armor to physically defend the body.
Heart structure 3-chambered One can say that the reptile heart has three chambers, two atria and one, partially divided, ventricle. Or one may argue that reptiles have four-chambered hearts with two atria and two ventricles, but the wall between the ventricles is incomplete.
Limbs Short fore limbs and long hind limbs with five webbed digits. Reptiles usually have four limbs, but some reptiles (snakes) have no limbs. Reptiles with limbs vary in their ability to move; some move very slowly and crawl, while others can run, jump, and even climb. One type of lizard can even run on water.
Skin Texture Smooth, moist and sometimes rather sticky skin. Laden with mucous glands. Dry and scaly. Scales are made of keratin. Skin is found underneath the scales.
Eggs Have soft, gel surrounding their eggs without any hard covering. Usually, found in water or damp places. Amniotic egg. Have hard, leathery eggs laid on land or they keep eggs in their bodies until they hatch.
Reproduction External fertilization Internal fertilization

Differences in Physical Attributes

Reptiles and amphibians have major physical differences. Reptiles have dry and scaly skin, whereas amphibians feel moist and sometimes rather sticky. They are vertebrates and cold blooded like amphibians. As compared to reptiles, amphibians have smooth skin. The skin of most amphibians is not water-proof unlike reptiles. Although most of the amphibians have lungs, they usually breathe through their skin and lining of their mouth, whereas most reptiles do not. Most amphibians have four limbs. Limbs and lungs are for adaptations of life on land and distinguish them from reptiles.

Source: www.diffen.com

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