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Description
A very early Carboniferous synapsid (stem-mammal), Ianthasaurus had cross-bars on its neural spines that may have supported keratinous spines. At this point in mammal-line evolution, synapsids were still cold-blooded, so here our scaly subject is sunbathing.

Description
A very early Carboniferous synapsid (stem-mammal), Ianthasaurus had cross-bars on its neural spines that may have supported keratinous spines. At this point in mammal-line evolution, synapsids were still cold-blooded, so here our scaly subject is sunbathing.