Related topics: species · frogs

A new ranavirus threatens US amphibian diversity

Kudzu and emerald ash borer are widely known examples of an invasive plant and an invasive insect, respectively, that cause harm to our native plants. Their impacts are obvious in our landscapes. Not so well known are the ...

When naproxen breaks down, toads croak

A new study in Environmental Toxicology and Chemistry takes a harder look at the effects a common anti-inflammatory medication and its degradation products have on amphibians. There have been many studies that review the ...

Amphibians infected by ranavirus found in Atlantic Rainforest

Researchers have found bullfrog tadpoles with clear signs of infection by ranavirus in Brazil. The specimens were collected from two ponds in the city of Passo Fundo, South of the country (state of Rio Grande do Sul), in ...

Environmental oxygen triggers loss of webbed digits

Free fingers have many obvious advantages on land, such as in locomotion and grasping, while webbed fingers are typical of aquatic or gliding animals. But both amphibians and amniotes—which include mammals, reptiles, and ...

The extinction crisis is 'unprecedented in human history'

A recent landmark United Nations report delivered an alarming assessment of the fate of animal life and biodiversity on Earth. According to the authors—145 experts from fifty countries—up to 1 million species are threatened ...

Frog fungus fights back

Amphibian populations have been declining around the world for more than 40 years. One culprit is the fungus B. dendrobatidis, which causes the disease chytridiomycosis.

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Amphibian

   Order Temnospondyli - extinct Subclass Lepospondyli - extinct Subclass Lissamphibia    Order Anura    Order Caudata    Order Gymnophiona

Amphibians (class Amphibia), such as frogs, toads, salamanders, newts, and caecilians, are ectothermic (or cold-blooded) animals that metamorphose from a juvenile water-breathing form, to an adult air-breathing form. Though amphibians typically have four limbs, the Caecilians are notable for being limbless. Unlike other land animals (amniotes), amphibians lay eggs in water. Amphibians are superficially similar to reptiles.

Amphibians are ecological indicators, and in recent decades there has been a dramatic decline in amphibian populations around the globe. Many species are now threatened or extinct.

Amphibians evolved in the Devonian Period and were top predators in the Carboniferous and Permian Periods, but many lineages were wiped out during the Permian-Triassic extinction. One group, the metoposaurs, remained important predators during the Triassic, but as the world became drier during the Early Jurassic they died out, leaving a handful of relict temnospondyls like Koolasuchus and the modern orders of Lissamphibia.

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