In amphibians there are many devices for the protection of the eggs during the early stages of development and the youngs. In this way nature has practised economy in the number of eggs, which varies in direct proportion to the chances of destruction. Parental care is the care of the eggs or the youngs until they become able to protect [...]
In this article we will discuss about the origin of amphibia with the help of suitable diagrams. During the late Devonian period osteolepid fishes such as Eusthenopteron lived in the freshwater systems. It is supposed that some of these animals, first crawling from pool to pool and then spending more time on the land, gave rise to the terrestrial Amphibia. [...]
In this article we will discuss about the neoteny and paedogenesis of amphibia with help of a suitable diagram. In the genus Amblystoma (urodele) the animal sometimes becomes sexually mature in the larval condition and does not metamorphose (Siredon, the axolotl). This phenomenon of the retention of larval characters in the sexually mature state has been called neoteny or paedogenesis. [...]