Laying Low 200 Million Years Ago

He transmigrated to the Triassic period, 230 million years ago, and became a small modern-day-extinct Gobi lizard. In this primeval age, the Synapsids are on the decline, the Pseudosuchians reign supreme, and the Avemetatarsalians are just rising. As a squamate lizard, an ancient member of the lineage that would later give rise to lizards and snakes, should he lie low until the modern era, or lead his kind to fight the archosaurs for dominion over the world?

An evolution novel (in the vein of Forty-Six Billion Years), a strange-beast novel (prehistoric creatures in the early stages, mythology later on). The protagonist never becomes human.