amphibian


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amphibian

(ăm-fĭb′ē-ən)
n.
Any of various cold-blooded, usually smooth-skinned vertebrates of the class Amphibia, characteristically hatching as an aquatic larva with gills and then transforming into an adult having air-breathing lungs. Frogs, toads, salamanders, and caecilians are amphibians.

amphibian

(am-fĭb′ē-ăn)
An animal of the class Amphibia.
amphibian, adjective

amphibian

a member of the vertebrate class Amphibia, containing frogs, toads, newts, salamanders and the burrowing caecilians. Descended from fish-like animals, they colonized the land in the late DEVONIAN PERIOD. They are thought to be the immediate ancestors of the reptiles, though present-day amphibians are little like their Devonian ancestors. Most amphibians, although normally terrestrial animals, return to water during the breeding season. Fertilization is external (the eggs lacking a shell and embryonic membranes), and the eggs are usually laid and develop in water.
References in periodicals archive ?
Ultraviolet radiation, toxic chemicals and amphibian population declines.
Alien predators and amphibian declines: review of two decades of science and the transition to conservation.
This ensured consistency in data collection and prevented the potential transfer of Bd, if present, from one amphibian to another and from one installation to another.
IUCN and its partners Conservation International and NatureServe have released an Amphibian Action Conservation Plan, which outlines ways that international institutions, national governments, corporations and even everyday people can take part in helping to save our frogs and their relatives.
The amphibian diversity in India is unique and extraordinary because about 60 percent of Indian amphibians are not found in any other part of the world.
Warming temperatures can kill off reptiles and amphibians by changing their habitats or making them more vulnerable to certain diseases.
To learn more about the Amphibian (which comas in black, blue, or red emblazoned with the unmistakable Frogger emblem) and other golf products, visit www.
Amphibian biologists are concerned about a worldwide decline in amphibian numbers and species (Blaustein & Wake 1990; Wyman 1990; Wake 1991; Stuart et al.
But amphibian populations have been fluctuating for a long time, and at this point it's just unclear whether we're dealing with year-to-year variation or a long-term trend.
Helen Meredith, Edge amphibians co-ordinator, said: "Clearly there is no time to waste if we are to prevent further species loss and effectively conserve unusual, threatened and neglected amphibian species in the wild.
The study results indicate that exposure to oxidant air pollution might be a contributing factor to declines in amphibian populations.