Longirostrotylopus holroydae

Longirostrotylopus holroydae is an extinct species of camelid, a member of the family Camelidae, and the only species of the genus Longirostrotylopus. It was named by Prothero and colleagues in 2026, and the Paleobiology Database records its holotype as UCMP 76605, a skull with jaws. The species is known from a nearly complete skull and mandible together with separate skull and body bones from several localities in the John Day Formation of Oregon, in Grant and Wheeler counties, and those finds fall in the early Arikareean to early Hemingfordian North American land mammal ages, in the late Oligocene to early Miocene. The Wikipedia article on the genus places it in the subfamily Floridatragulinae and calls it the first floridatraguline named from Oregon, since the group had been thought to be restricted to more southerly states and Panama. The database lists a terrestrial, ground-dwelling way of life and a browsing diet, values it takes from the wider Camelidae clade because fossils of the species itself do not show how it fed.