BARBOURULA KALIMANTANENSIS PDF

The Bornean flat-headed frog Barbourula kalimantanensis is a species of frog in the family Bombinatoridae. Djoko Iskandar , an Indonesian zoologist, first described the Bornean flat-headed frog based on a single specimen. Bickford et al. The frog breathes entirely through its skin, and its internal organs the stomach, spleen and the liver take up much of the space which normally would be filled by the lungs. By retaining the lunglessness of their tadpole stage, the frogs are much flatter than typical frogs, which might help absorb oxygen and avoid being swept away in fast streams. It has a dorsoventrally flattened body with a broad head with a rounded snout.

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By Catherine Brahic. An unassuming little frog from Borneo has been found to have an exceedingly rare anatomical feature — introducing Barbourula kalimantanensis , the only known frog with no lungs. The Bornean flat-headed frog gets all of its oxygen through its skin. Local gold-mining operations, however, are fast polluting the streams where the frog lives. A single specimen of Barbourula was described in the s, but biologists had no idea, until now, that the frog had no lungs.

Lunglessness is extremely rare in amphibians because, although the animals breathe through their skin, the method delivers only a fraction of the oxygen provided by lungs. It is only practical for cold-blooded animals, which use far less energy than mammals. One family of salamanders and one species of caecilians are the only other lungless amphibians. There are no known lungless reptiles. The clear, cold, fast-flowing streams they live in made this change possible.

But deforestation and illegal gold mining is making the streams warm and sluggish — hostile habitat for the Bornean flat-headed frog. Endangered species — Learn more about the conservation battle in our comprehensive special report.

By Catherine Brahic The Bornean flat-headed frog lives in fast-flowing streams and is the only known lungless frog Image: D. Trending Latest Video Free. Why have there been so many coronavirus deaths in the UK? Covid news: People in the UK are sleeping less well under lockdown coronavirus vaccines are in development — but will any work? Two-sided solar panels that track the sun produce a third more energy We've just found the largest and oldest Mayan monument yet.

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21. Bornean Flat-headed Frog

By Catherine Brahic. An unassuming little frog from Borneo has been found to have an exceedingly rare anatomical feature — introducing Barbourula kalimantanensis , the only known frog with no lungs. The Bornean flat-headed frog gets all of its oxygen through its skin. Local gold-mining operations, however, are fast polluting the streams where the frog lives. A single specimen of Barbourula was described in the s, but biologists had no idea, until now, that the frog had no lungs.

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World's only lungless frog leaves scientists gasping

This species is a medium-sized frog males to 66 mm SVL, females to The nostrils of this frog are located at the end of the snout and are flush with the skin. There is no canthus rostralis and no lores. Eyes are located anterolaterally on the head, with a free nasolacrimal papilla positioned just below the lower eyelid. The tympanic annulus is lacking.

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First Lungless Frog Discovered in Indonesia

All rights reserved. The invasion of land by the tetrapods — four-limbed animals that include mammals, reptiles and amphibians — was surely one of the most evocative events in animal evolution. The march onto terra firma began some million years ago and was driven by a suite of innovative adaptations that allowed back-boned animals to live out of water. Lungs were among the most crucial of these for they allowed the first land-lubbers to extract oxygen from the surrounding air.

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Bornean flat-headed frog

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