Reason: Scaly reptilian skin, no oral tissue.
You may ask further questions about the accuracy of this image at the image review page of Wikiproject Palaeontology on the English Wikipedia. Note that this image may be appropriate to illustrate obsolete paleontological views.
Summary
DescriptionDimetrodonKnight.jpg
Dimetrodon painting by Charles R. Knight, Edaphosaurus in the background.
This is a faithful photographic reproduction of a two-dimensional, public domain work of art. The work of art itself is in the public domain for the following reason:
Public domainPublic domainfalsefalse
The author died in 1953, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer.
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
The official position taken by the Wikimedia Foundation is that "faithful reproductions of two-dimensional public domain works of art are public domain". This photographic reproduction is therefore also considered to be in the public domain in the United States. In other jurisdictions, re-use of this content may be restricted; see Reuse of PD-Art photographs for details.
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