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Skin

No fossil evidence of Dimetrodon' s skin has yet been found. Impressions of the skin of a related animal, Estemmenosuchus, indicate that it would have been smooth and well-provided with glands, but this form of skin may not have applied to Dimetrodon, as its lineage is fairly distant. Dimetrodon also may have had large scutes on the underside of its tail and belly, as other synapsids had these. Evidence from the varanopid Ascendonanus suggests that some early synapsids may have had squamate -like scales. However, some recent studies have put varanopids as taxonomically closer to diapsid reptiles.