The earliest tetrapods were found in the sediments from the Evonian Period (374 million to 354 million years ago); except genus Salamandridae that was found in the ocean outside of Russia , most ..........
The origin of present day amphibians is still a mystery in contrast to that of the reptiles. In general, fossil records that link the three genera of present day amphibians to the ancient ..........
Many features that evolved from early tetrapods are related to the key transformations from water to land, and are inherited by their descendants – the amphibians. For this reason, amphibians have ..........
Amphibians can be found on all continents around the world except Antarctica . Their habitat ranges from sea level, in caves that is lower than the sea level, underground streams without lights, ..........
Among any vertebrate animals, amphibians showed the most diversity in reproduction; the method of fertilization can be either internal or external. Most primitive families (Cryptobranchus and ..........
The world of amphibians is being threatened. Although geochronologic scale has shown that extinction is rather common, the amphibians are disappearing at an alarming rate. More than 10 species are ..........
Ever since ancient times, men have grouped similar species to create various categories and gave these categories a distinct name. Aristotle recognized the four major groups of vertebrate animals ..........
The herpetologists began to pay attention to the sharp reduction of global amphibious groups in 1989. The cause for the significant extinctive decline in the numbers of several species is a sign ..........
The fiercest impact that the amphibians endured in the recent decade is diseases. The mass mortality of European Common Frogs in several areas in southern England in 1990s is caused by viral ..........
The survival of the amphibians around the world is facing all types of threat. From geological scale, the scope of these relentless threats ranges from global phenomenon such as climate changes, ..........