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=== Ligazóns externas ===
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===== Xeneralidades sobre tetrápodos =====
* [http://www.palaeos.com/Vertebrates/Units/150Tetrapoda/150.000.html#What's a "Tetrapod"? What is a tetrapod?]
* [http://www.ucmp.berkeley.edu/vertebrates/tetrapods/tetraintro.html UCMP Taxonomy page]
* [http://news.softpedia.com/news/How-did-fish-grow-legs-15424.shtml How did fish grow legs?] ▼* [http://www.palaeos.com/Vertebrates/Units/150Tetrapoda/150.000.html Tetrapod cladograms]
▲* [http://news.softpedia.com/news/How-did-fish-grow-legs-15424.shtml How did fish grow legs?]
* [http://go.reuters.com/newsArticle.jhtml?type=scienceNews&storyID=11761794&src=rss/scienceNews New fossils fill gap between water and land animals]
* [http://www.livescience.com/animalworld/060119_breathing_ears.html Human Ears Evolved from Ancient Fish Gills]
* [http://www.sciam.com/print_version.cfm?articleID=000DC8B8-EA15-137C-AA1583414B7F0000 Scientific American: Getting a Leg Up on Land]
===== Tetrápodos do devónico =====
* [http://news.nationalgeographic.com/news/2002/12/1218_021218_tetrapod.html ''Sinostegia'' discovery reported in ''National Geographic'']
* [http://www.devoniantimes.org/index.html ''Devonian Times'']
* [http://www.devoniantimes.org/Order/trackways.html ''Devonian Times'' - Tetrapod Trackways]
===== Tetrápodos do carbonífero =====
* [http://www.origins.tv/darwin/tetrapods.htm Detailed account of early tetrapod evolution]
* [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12097908&dopt=Abstract Abstract of Jennifer A. Clack, "An early tetrapod from 'Romer's Gap'"] in ''Nature'', July 2002
* [http://www.nature.com/cgi-taf/DynaPage.taf?file=/nature/journal/v394/n6688/abs/394066a0_r.html Abstract of Jennifer Clack's identification of a primitive baphetid tetrapod]
* [http://www.origins.tv/darwin/tetrapods.htm "The evolution of tetrapods and the closing of Romer's Gap."]
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