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Amphibians (class Amphibia) are a taxon of animals that include all tetrapods, four-legged vertebrates, that do not have amniotic eggs.(from Greek αμφις "both" and βιος "life") are ectotherms, and generally spend part of their time on land, but most do not have the adaptations to an entirely terrestrial existence found in most other modern tetrapods (amniotes). There are around 6,000 described, living species of amphibians. The study of amphibians and reptiles is known as herpetology.
History of amphibians
Amphibians developed with the characteristics of pharyngeal slits/gills, a dorsal nerve cord, a notochord, and a post-anal tail at different stages of their life. Though early tetrapods (which appeared 390 million years ago in the Devonian period) are often referred to as "amphibians", the first true amphibians (of the order Temnospondyli) appeared during the early Carboniferous period. During the late Carboniferous, Permian and Triassic periods, amphibians were extremely diverse, including many large and small forms, some newt and salamander-like, others resembling snakes or eels, and some large-snouted forms that were very like small (about 1.5 meter long) crocodiles (e.g. Archegosaurus). The drying out of the coal swamps during the latest Carboniferous and again at the end of the Early Permian diminished many of the environments of these Paleozoic amphibians, with the result that many types died out, and they were supplanted by reptiles. However both large and small amphibians still continued to flourish in rivers and lakes of the Late Permian, alongside the diverse therapsids or mammal-like reptiles that were the dominant land animals of that time. During the following, Triassic period, there were many genera with large, sometimes very flattened heads and very weak limbs; some of these, like Paracyclotosaurus, Cyclotosaurus and Mastodonsaurus were several meters in length. Apart from a few stragglers, all these large amphibians died out at the Triassic-Jurassic extinction event, and the majority of Jurassic amphibians belonged to modern groups, and would look familiar today.
Throughout their history, amphibians have ranged in size from large forms, such as the above mentioned Triassic genera, the 5 foot (150cm) long Eryops of the Permian period, and the Giant Japanese and Chinese Salamanders of today, down to the tiny Brachycephalus didactylus (Brazilian Gold Frog) and Eleutherodactylus iberia (leptodactylid frog) from Cuba, with a total length of 9.6-9.8 millimeters (0.4 inches). Amphibians have mastered almost every climate on earth from the hottest deserts to the frozen arctic.
More on [ Amphibian ]
HERPETOTROPICOS: Amphibians and Reptiles of Northeast India: Amphibians and Reptiles of Northeast India. A photogra... http://bit.ly/8RvJKY
swis7 (sev swis) Sun, 20 Dec 2009 17:38:53 -0000
HERPETOTROPICOS: Amphibians and Reptiles of Northeast India: Amphibians and Reptiles of Northeast India. A photogra... http://bit.ly/8RvJKY
NYC event: Hall of Reptiles and Amphibians - Amphibians were the first vertebrates to live on land. From them evolv... http://ow.ly/16bzyD
nyccom (NYC.com) Sun, 20 Dec 2009 10:30:05 -0000
NYC event: Hall of Reptiles and Amphibians - Amphibians were the first vertebrates to live on land. From them evolv... http://ow.ly/16bzyD
What does a herpetologist study? "Reptiles and amphibians"
SlyBilly (William DiSilvestro) Sat, 19 Dec 2009 05:51:30 -0000
What does a herpetologist study? "Reptiles and amphibians"
@urbanBeaute kinda, yellow is poisonous color for reptiles and amphibians correct? and oh that kinda explan how she know
JayLaMusica (jeremy latimore) Sat, 19 Dec 2009 05:41:29 -0000
@urbanBeaute kinda, yellow is poisonous color for reptiles and amphibians correct? and oh that kinda explan how she know
Reptiles and Amphibians Invade Wheeler Gorge!. http://r2u.at/j6jOqn
yoloneci64186 (Ojai, CA) Sat, 19 Dec 2009 05:32:27 -0000
Reptiles and Amphibians Invade Wheeler Gorge!. http://r2u.at/j6jOqn
My Life with Reptiles, Amphibians, and High Ranking Government Officials http://twa.lk/95Pfg
sonnyerv (Sonny Ervan) Fri, 18 Dec 2009 09:42:16 -0000
My Life with Reptiles, Amphibians, and High Ranking Government Officials http://twa.lk/95Pfg
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The Grumpy Frog Card Shoppe - Greeting cards.
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Worlds First Patented Snake Walking System - A novel product that enables snake owners the opportunity to remove them from their enclosures and walk them safely on a collar/tether system.
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