Pliometanastes

Pliometanastes; Temporal range: Late Miocene-Early Pliocene (Hemphillian); ~10.3–4.9 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Pilosa
Family:	†Megalonychidae
Subfamily:	†Megalonychinae
Genus:	†Pliometanastes; Hirschfeld & Webb 1968
Species
	P. galushai Hirschfeld & Webb 1968; P. protistus Hirschfeld & Webb 1968 (type);

Pliometanastes is an extinct genus of ground sloths of the family Megalonychidae endemic to North America during the Late Miocene epoch through very early Pliocene epoch (Hemphillian in the NALMA classification). Its fossils have been found in Costa Rica and across the southern United States from California to Florida.^[1]

Description

Pliometanastes and Thinobadistes were the first of the giant sloths to appear in North America, the former around 9 million years ago.^[2] Both were in North America before the Panamanian Land Bridge formed around 2.7 million years ago, which led to the main pulse of the Great American Interchange. It is then reasonable to presume that the ancestors of Pliometanastes island-hopped across the Central American Seaway from South America, where ground sloths arose.^[3]

Pliometanastes gave rise to Megalonyx. Their closest extant relatives, based on molecular results (which clash with earlier conclusions derived from morphology) are the extant arboreal three-toed sloths (Bradypus).^[4]^[5]

P. protistus has been estimated to weigh 851 kg.^[6]

Taxonomy

Pliometanastes was named by Hirschfeld and Webb (1968). Its type is Pliometanastes protistus. It was assigned to Megalonychidae by Hirschfeld and Webb (1968) and Carroll (1988).^[7]^[8]

References

^ "Pliometanastes". Paleobiology Database. Retrieved 2011-07-16.
^ Tedford, R.H.; Albright, L.B.; Barnosky, A.D.; Ferrusquaia-Villafranca, I.; Hunt, R.M.; Storer, J.E.; Swisher, C.C.; Voorhies, M.R.; Webb, S.D.; Whistler, D.P. (21 April 2004). "Mammalian Biochronology of the Arikareean Through Hemiphilian Interval (Late Oligocene Through Early Pliocene Epochs)". In Woodburne, M.O. (ed.). Late Cretaceous and Cenozoic Mammals of North America: Biostratigraphy and Geochronology. Columbia University Press. pp. 169–231, see also p. 337. ISBN 978-0231503785. OCLC 880404891.
^ Tetrapod Zoology Archived 2011-03-18 at the Wayback Machine, Scienceblogs, Ten things you didn't know about sloths, by Darien Naish, University of Portsmouth January 23, 2007.
^ Presslee, S.; Slater, G. J.; Pujos, F.; Forasiepi, A. M.; Fischer, R.; Molloy, K.; Mackie, M.; Olsen, J. V.; Kramarz, A.; Taglioretti, M.; Scaglia, F.; Lezcano, M.; Lanata, J. L.; Southon, J.; Feranec, R.; Bloch, J.; Hajduk, A.; Martin, F. M.; Gismondi, R. S.; Reguero, M.; de Muizon, C.; Greenwood, A.; Chait, B. T.; Penkman, K.; Collins, M.; MacPhee, R.D.E. (2019). "Palaeoproteomics resolves sloth relationships" (PDF). Nature Ecology & Evolution. 3 (7): 1121–1130. Bibcode:2019NatEE...3.1121P. doi:10.1038/s41559-019-0909-z. PMID 31171860. S2CID 174813630.
^ Delsuc, F.; Kuch, M.; Gibb, G. C.; Karpinski, E.; Hackenberger, D.; Szpak, P.; Martínez, J. G.; Mead, J. I.; McDonald, H. G.; MacPhee, R.D.E.; Billet, G.; Hautier, L.; Poinar, H. N. (2019). "Ancient Mitogenomes Reveal the Evolutionary History and Biogeography of Sloths". Current Biology. 29 (12): 2031–2042.e6. Bibcode:2019CBio...29E2031D. doi:10.1016/j.cub.2019.05.043. hdl:11336/136908. PMID 31178321.
^ David Lambert, W. (2006). "Functional Convergence of Ecosystems: Evidence from Body Mass Distributions of North American Late Miocene Mammal Faunas". Ecosystems. 9 (9): 97–118. Bibcode:2006Ecosy...9...97L. doi:10.1007/s10021-005-0076-8. S2CID 30660487.
^ S. E. Hirschfeld and S. D. Webb. 1968. Bulletin of the Florida State Museum 12(5)
^ R. L. Carroll. 1988. Vertebrate Paleontology and Evolution. W. H. Freeman and Company, New York 1-698