Ricardo is part of an international team which discovered fly specimens in El Soplao cave (Cantabria, Spain). Study of these specimens found pollination in an extinct group of flies preserved in Spanish amber for more than a hundred million years.
http://www.ub.edu/web/ub/en/menu_eines/noticies/2015/07/020.html
Read more about the find and its significance in:
Peñalver E, Arillo A, Pérez-de la Fuente R, Riccio ML, Delclòs X, Barrón E, Grimaldi DA. ...
Read more about Pollination of Creteaceous plants