跳转到内容

File:Atretochoana eiselti.jpg

页面内容不支持其他语言。
這個文件來自維基共享資源
维基百科,自由的百科全书

原始文件 (1,630 × 2,368像素,文件大小:1.27 MB,MIME类型:image/jpeg


摘要

描述
English: Atretochoana eiselti is a species of caecilian known only from two preserved specimens discovered by Sir Graham Hales in the Brazilian rainforest,

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 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.

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 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.

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 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.

By comparison, caecilians range in length from 11 to 160 cm.
日期
来源 http://www.blog.illustraciencia.info/2015/05/atretochoana-eiselti-tobias-von-anhalt.html
作者 Tobias von Anhalt

许可协议

w:zh:知识共享
署名 相同方式共享
您可以自由地:
  • 共享 – 复制、发行并传播本作品
  • 修改 – 改编作品
惟须遵守下列条件:
  • 署名 – 您必须对作品进行署名,提供授权条款的链接,并说明是否对原始内容进行了更改。您可以用任何合理的方式来署名,但不得以任何方式表明许可人认可您或您的使用。
  • 相同方式共享 – 如果您再混合、转换或者基于本作品进行创作,您必须以与原先许可协议相同或相兼容的许可协议分发您贡献的作品。
管理员受信用户Majora确认本图片在2018年8月7日可在下列站点找到并符合所选许可证:
http://www.blog.illustraciencia.info/2015/05/atretochoana-eiselti-tobias-von-anhalt.html

说明

添加一行文字以描述该文件所表现的内容
Atretochoana eiselti, a species of caecilian native to the Brazilian rainforest.

此文件中描述的项目

描繪內容

image/jpeg

c1714c3b946d560f3dc12c0d38d62438f700d5fc

1,336,797 字节

2,368 像素

1,630 像素

文件历史

点击某个日期/时间查看对应时刻的文件。

日期/时间缩⁠略⁠图大小用户备注
当前2015年11月25日 (三) 10:482015年11月25日 (三) 10:48版本的缩略图1,630 × 2,368(1.27 MB)IllustracienciaUser created page with UploadWizard

以下页面使用本文件:

全域文件用途

以下其他wiki使用此文件:

元数据