Amphibian vs Reptile - Difference and Comparison

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	Amphibian	Reptile
Method of Breathing:	Gills and lungs	Lungs
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 claws or nails.	claws, whipping tails and bites (some have venom; Gila monster, beaded lizard)
Introduction:	Amphibians mean living two lives (on land as well as on water). Amphibians are usually watery animals, and have smooth skin.	Reptiles are groups of animals that breathe air, have scales, and lay eggs.
Skin Texture:	Smooth, moist and sometimes rather sticky skin. Laden with mucous glands.	Dry and scaly. Scales are small folds in skin. Skin is found underneath the scales.
Eggs:	Have soft, gel surrounded eggs without any hard covering. Found in water or damp places.	Have hard, leathery eggs laid on land or they keep eggs in their bodies until they hatch.
Examples:	Frog, toad, newts, salamanders	Snakes, lizards, crocodiles, goanna

Amphibians: Amphibians mean “living double lives,” meaning that they live two lives: one in water with gills and the other on land by growing lungs as they age. They are vertebrates and cold blooded (ectothermic). Early amphibians, a crucial link from fish to terrestrial reptiles, were the first animals to leave the sea and venture onto the land.

Reptiles: Reptiles (meaning “to creep”) are a group of animals that have scales (or modified scales), breathe air, and usually lay eggs. Most reptiles live on land and reproduce by laying eggs. Crocodiles, snakes, lizards, and turtles are all examples of reptiles.

Reptiles and amphibians are in fact distantly related to each other and they do have lot of similarities, but still there are few differences between the two. Both can be distinguished from each other looking at their physical appearance and different stages of life.

1 Evolution
- 1.1 Reptiles
- 1.2 Amphibians
2 Physical Attributes
- 2.1 Water Preferences
3 Reproduction
4 Types
5 See Also
6 References

[edit] Evolution

[edit] Reptiles

Hylonomus is the oldest known reptile was about 8 to 12 inches long with origins 200 million years ago. The first true "reptiles" (Sauropsids) are categorized as Anapsids, having a solid skull with holes only for nose, eyes, spinal cord, etc. Turtles are believed by some to be surviving Anapsids. Shortly after the first reptiles, two branches split off, one leading to the Anapsids, which did not develop holes in their skulls. The other group, Diapsida, possessed a pair of holes in their skulls behind the eyes, along with a second pair located higher on the skull. The Diapsida split yet again into two lineages, the lepidosaurs (which contain modern snakes, lizards and tuataras, as well as, debatably, the extinct sea reptiles of the Mesozoic) and the archosaurs (today represented by only crocodilians and birds, but also containing pterosaurs and dinosaurs).

The earliest, solid-skulled amniotes also gave rise to a separate line, the Synapsida. Synapsids developed a pair of holes in their skulls behind the eyes (similar to the diapsids), which were used to both lighten the skull and increase the space for jaw muscles. The synapsids eventually evolved into mammals.

[edit] Amphibians

The first major groups of amphibians developed in the Devonian Period( A period of geological time around 350 million years ago) from fishes similar to the modern coelocanth where the fins had evolved into legs. These amphibians were around five meters long in length, which is rare now. In the Carboniferous Period, the amphibians moved up in the food chain and began to occupy the ecological position where we now find crocodiles. These amphibians were notable for eating the mega-insects on land and many types of fishes in the water. Towards the end of the Permian Period and the Triassic Period, the amphibians started having competition with proto-crocodiles which led to their drop in size in the temperate zones or leaving for the poles. (Amphibians were able to hibernate during the winter whereas crocodiles could not, allowing the amphibians in higher latitudes protection from the reptiles.)

[edit] 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.

[edit] Water Preferences

Amphibians are typically water animals whereas Reptiles aren’t.

[edit] Reproduction

Both reptiles and amphibians reproduce by laying eggs, but reptiles have hard leathery eggs to protect the young ones inside and are often laid in buried, insulated nests. Eggs of amphibians are soft without any type of external membrane and are usually attached to the stems of aquatic plants.

[edit] Types

There are three main categories (orders) of amphibians: newts and salamanders (urodeles); frogs and toads (anurans); and caecilians (the worm-like gymnophiones).
There are four reptile orders in existence today. Crocodilia refer to animals like crocodiles and alligators. Squamata refers to lizards, snakes, and similar creatures. All turtles are included in the Testudines order. The order Rhynchocephalia contains only two species known as tuataras, native to New Zealand.