https://www.livescience.com/60013-cretaceous-mantis-fossil.html
Scientists described an exceptionally well-preserved praying mantis fossil embedded in a rock slab excavated from a site in northeastern Brazil, dating the mantis to about 110 million years ago and identifying it as Santanmantis axelrodi, according to a new study.
Here is a link to the open access paper:
https://peerj.com/articles/3605/