Image: Petrolacosaurus BW
Petrolacosaurus_BW.jpg (800 × 313 pixels, file size: 20 KB, MIME type: image/jpeg)
Description: Petrolacosaurus kansensis, a primitive diapsida from the Late Carboniferous of Kansas, pencil drawing
Title: Petrolacosaurus BW
Credit: Own work
Author: Nobu Tamura (http://spinops.blogspot.com)
Usage Terms: Creative Commons Attribution 2.5
License: CC BY 2.5
License Link: http://creativecommons.org/licenses/by/2.5
Attribution Required?: Yes
Image usage
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