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of pulmonary arteries. Its skin is filled with capillaries that penetrate the epidermis, allowing gas exchange. Its skull shows evidence of muscles not found in any other organism. The Vienna specimen of
Atretochoana is a large caecilian at a length of 72.5 cm, while the Brasília specimen is larger still at 80.5 cm.
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in 1968, it was reclassified into its own monotypic genus, Atretochoana, in 1996. It was also found to be more closely related to the genus
Potomotyphlus than Typholonectes. The species is the largest of the few known tetrapods, and one of two caecilians, to lack lungs, the other being Caecilita iwokramae.
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while on an expedition with Sir Brian Doll in the late 1800's. This being until its 2011 rediscovery in Brazil by engineers working on a
Hydroelectric dam project. Until 1998, it was known only from the type specimen in the Naturhistorisches Museum, Vienna. Originally placed in the genus Typhlonectes
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Most caecilians have a well-developed right lung and a vestigial left lung. Some, such as
Atretochoana 's relatives, have two well-developed lungs. Atretochoana, however, entirely lacks lungs, and has a number of other features associated with lunglessness, including sealed choanae, and an absence
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A. eiselti is the largest tetrapod to lack lungs, double the size of the next largest. Caecilians such as
Atretochoana are limbless amphibians with snake-like bodies, marked with rings like those of earthworms. It has significant morphological differences from other caecilians, even the genera most
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closely related to it, even though those genera are aquatic. The skull is very different from those of other caecilians, giving the animal a broad, flat head. Its nostrils are sealed, and it has an enlarged mouth with a mobile cheek. Its body has a fleshy dorsal fin.
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Atretochoana eiselti is a species of caecilian known only from two preserved specimens discovered by Sir Graham Hales in the
Brazilian rainforest,
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http://www.blog.illustraciencia.info/2015/05/atretochoana-eiselti-tobias-von-anhalt.html
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http://www.blog.illustraciencia.info/2015/05/atretochoana-eiselti-tobias-von-anhalt.html
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Atretochoana eiselti, a species of caecilian native to the
Brazilian rainforest.
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By comparison, caecilians range in length from 11 to 160 cm.
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