A few years old (new to me) but very interesting. Jurassic "butterflies" (from before the time of flowers) look like true ones that appeared much later.
https://blogs.scientificamerican.com/artful-amoeba/butterflies-in-the-time-of-dinosaurs-with-nary-a-flower-in-sight/?fbclid=IwAR0RxObAJG7LIjG-ZMzvlZYG2mti1zJ0FAMUArv3UXZ6UusoT165IdriJDU