Longirostrotylopus

Longirostrotylopus; Temporal range: Oligocene–Early Miocene (Ar2–He1 [NALMA]) PreꞒ Ꞓ O S D C P T J K Pg N Pal. Eocene Oligo. Miocene P P
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Artiodactyla
Family:	Camelidae
Subfamily:	†Floridatragulinae
Genus:	†Longirostrotylopus; Prothero et al., 2026
Species:	†L. holroydae
Binomial name
	†Longirostrotylopus holroydae; Prothero et al., 2026
Synonyms
	Longirostromeryx Prothero et al., 2026 (lapsus calami);

Longirostrotylopus is an extinct genus of camelid artiodactyl in the subfamily Floridatragulinae. The genus contains a single species, Longirostrotylopus holroydae, known from a nearly complete skull and mandible, along with various nonassociated cranial and postcranial remains from different localities. It is known from the John Day Formation of Oregon, United States, which is assigned to the early Arikareean to early Hemingfordian North American land mammal ages (NALMAs), which are correlated to the Oligocene–early Miocene epochs. It is the first floridatraguline named from Oregon, extending the clade's range beyond the more southerly states and Panama, where it was previously thought to be restricted to.

References

↑ Jiménez-Hidalgo, Eduardo; Lander, E. Bruce; Israde-Alcántara, Isabel; Rodríguez-Caballero, Nadia Wendoline; Guerrero-Arenas, Rosalía (August 2021). "Earliest Arikareean (later early Oligocene) Iniyoo local Fauna from Chilapa Formation of Santiago Yolomécatl area in northwestern Oaxaca, southern Mexico". Journal of South American Earth Sciences. 109 103307. doi:10.1016/j.jsames.2021.103307.
↑ Hulbert Jr., Richard C. (2015-07-05). "Florida Vertebrate Fossils - Hemingfordian North American Land Mammal Age". Florida Museum. Archived from the original on 2026-08-04. Retrieved 2026-11-10.
↑ Prothero, Donald R.; Balassa, Daniella; Oganesyan, H. Cruz; Parod, Scarlet (2026). "Chapter 4: Chapter 4: Review of the primitive Camelidae: poebrotheres, stenomylines, floridatragulines, and nothokemadines". In Prothero, Donald R.; White, Richard S.; Morgan, Gary S.; Lucas, Spencer G.; Lichtig, Asher J. (eds.). Bulletin 104: The evolution of North American camels. Albuquerque: New Mexico Museum of Natural History and Science. pp. 31–56. ISSN 1524-4156.
↑ Prothero, Donald R.; Famoso, Nicholas A.; Parod, Scarlet; Welsh, Ed R.; Watmore, Kristin I. (2026). "Chapter 14: Late Oligocene-Late Miocene fossil camels from the John Day Basin, North-Central and Eastern Oregon". In Prothero, Donald R.; White, Richard S.; Morgan, Gary S.; Lucas, Spencer G.; Lichtig, Asher J. (eds.). Bulletin 104: The evolution of North American camels. Albuquerque: New Mexico Museum of Natural History and Science. pp. 293–309. ISSN 1524-4156.

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[J-H2021-1] Jiménez-Hidalgo, Eduardo; Lander, E. Bruce; Israde-Alcántara, Isabel; Rodríguez-Caballero, Nadia Wendoline; Guerrero-Arenas, Rosalía (August 2021). "Earliest Arikareean (later early Oligocene) Iniyoo local Fauna from Chilapa Formation of Santiago Yolomécatl area in northwestern Oaxaca, southern Mexico". Journal of South American Earth Sciences. 109 103307. doi:10.1016/j.jsames.2021.103307.

[Hulbert2015-2] Hulbert Jr., Richard C. (2015-07-05). "Florida Vertebrate Fossils - Hemingfordian North American Land Mammal Age". Florida Museum. Archived from the original on 2026-08-04. Retrieved 2026-11-10.

[Prothero_Ch.4-3] Prothero, Donald R.; Balassa, Daniella; Oganesyan, H. Cruz; Parod, Scarlet (2026). "Chapter 4: Chapter 4: Review of the primitive Camelidae: poebrotheres, stenomylines, floridatragulines, and nothokemadines". In Prothero, Donald R.; White, Richard S.; Morgan, Gary S.; Lucas, Spencer G.; Lichtig, Asher J. (eds.). Bulletin 104: The evolution of North American camels. Albuquerque: New Mexico Museum of Natural History and Science. pp. 31–56. ISSN 1524-4156.

[Longirostrotylopus-4] Prothero, Donald R.; Famoso, Nicholas A.; Parod, Scarlet; Welsh, Ed R.; Watmore, Kristin I. (2026). "Chapter 14: Late Oligocene-Late Miocene fossil camels from the John Day Basin, North-Central and Eastern Oregon". In Prothero, Donald R.; White, Richard S.; Morgan, Gary S.; Lucas, Spencer G.; Lichtig, Asher J. (eds.). Bulletin 104: The evolution of North American camels. Albuquerque: New Mexico Museum of Natural History and Science. pp. 293–309. ISSN 1524-4156.