https://phys.org/news/2018-05-ancient-fossil-million-year-gap-rewrites.html

It turns out that Megachirella, an intriguing little fossil reptile about the size of a bluetongue skink, is the ideal intermediate between modern lizards and their closest relatives, a broad group of reptiles that includes today's tuataras from New Zealand.

Only once in a blue moon is a fossil discovered that has a profound impact on our understanding of how major animal groups originated and evolved.