File:Platysomus gibbosus.jpg

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DescriptionPlatysomus gibbosus.jpg	Fig. 137.—Platysomus gibbosus, a "heterocercal" Ganoid, from the Middle Permian of Russia. Sharks. Not only are the Ganoids still the predominant group of Fishes, but all the known forms possess the unsymmetrical ("heterocercal") tail which is so characteristic of the Palæozoic Ganoids. Most of the remains of the Permian Fishes have been obtained from the "Marl-slate" of Durham and the corresponding "Kupfer-schiefer" of Germany, on the horizon of the Middle Permian; and the principal genera of the Ganoids are Palœoniscus and Platysomus (fig. 137).
Data	2 de octobre 1876
Origine	http://www.gutenberg.org/files/14279/14279-h/14279-h.htm
Autor	H. ALLEYNE NICHOLSON

Public domain	This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.	United States
	This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

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	Data/Hora	Miniatura	Dimensiones	Usator	Commento
actual	10:05, 2 augusto 2008		367 × 250 (46 KB)	FunkMonk	{{Information \|Description= \|Source= \|Date= \|Author= \|Permission= \|other_versions= }}
	16:35, 30 julio 2008		367 × 250 (23 KB)	FunkMonk	== Summary == {{Information \|Description=Fig. 137.—Platysomus gibbosus, a "heterocercal" Ganoid, from the Middle Permian of Russia. Sharks. Not only are the Ganoids still the predominant group of Fishes, but all the known forms possess the unsymmetrical

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