Saurophthirus
Saurophthirus is an extinct genus of giant stem-group flea, and the only member of the family Saurophthiridae. The type species, "S. longipes" is found in early Cretaceous strata of Baissa, Siberia. Two other species "S. exquisitus" and "S. laevigatus" is from the Lower Cretaceous aged Yixian Formation of China. Description. Body length of largest species, "S. longipes" is long. They are generally seen as transitional between more primitive stem-fleas such as Pseudopulicidae and "Tarwinia" and modern fleas.