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Amphibian - Wikipedia

en.wikipedia.org/wiki/Amphibian

Amphibians are ectothermic, tetrapod vertebrates of the class Amphibia. Modern amphibians .... Ichthyostega was one of the first primitive amphibians, with nostrils and more efficient lungs. It had ...

Ancient Amphibians - EDGE of Existence

www.edgeofexistence.org/amphibian_conservation/ancient_amphibians.php

Most of the distinctive characteristics of living amphibians – such as their ... The closest relatives of the first amphibians were lobe-finned fish related to modern ...

The evolution of amphibians: the conquest of the land | All you need ...

allyouneedisbiology.wordpress.com/2015/05/07/evolution-amphibians/

May 7, 2015 ... Amphibians were the first group of vertebrates to develop limbs and to be able to leave the water to conquer the land. Even if they are seen as ...

Fossil Record of the Amphibia

www.ucmp.berkeley.edu/vertebrates/tetrapods/amphibfr.html

The earliest well-known amphibian, Ichthyostega, was found in Late Devonian deposits in Greenland, dating back about 363 million years. The earliest ...

Characteristics and Evolution of Amphibians - Boundless

www.boundless.com/biology/textbooks/boundless-biology-textbook/vertebrates-29/amphibians-173/characteristics-and-evolution-of-amphibians-668-11889/

The fossil record provides evidence of the first tetrapods: now-extinct amphibian species dating to nearly 400 million years ago. Evolution of tetrapods from ...

300 Million Years of Amphibian Evolution - Dinosaurs - About.com

dinosaurs.about.com/od/otherprehistoriclife/a/prehistoric-amphibians.htm

During the Carboniferous period, over 300 million years ago, the first tetrapods ... For tens of millions of years, these early amphibians were the dominant ...

Geologic Time - EnchantedLearning.com

www.enchantedlearning.com/subjects/Geologictime.html

The first geologic time scale was proposed in 1913 by the British geologist Arthur ... mya (35% of all animal families die out, including labyrinthodont amphibians, ...

Amphibians - Backyard Nature

www.backyardnature.net/amphibs.htm

The oldest amphibian fossils look like fish with thick, muscular fins. That's because amphibians arose from early fish. The first amphibians lived more in water ...

amphibian - Evolution and classification | animal | Britannica.com

www.britannica.com/animal/amphibian/Evolution-and-classification

May 17, 2016 ... Amphibians were not the first tetrapods, but as a group they diverged from the stock that would soon, in a paleontological sense, become the ...

When did amphibians first appear on Earth? | Reference.com

www.reference.com/science/did-amphibians-first-appear-earth-ea06109c8a9ccc3b

Amphibians first appeared on Earth during the Devonian period, which was more than 400 million years ago. While this period is most famous for producing an ...