Megatheriinae

Megatheriinae Temporal range: Early Miocene to Early Holocene (Hemphillian-Rancholabrean (NALMA) & Santacrucian-Lujanian) (SALMA)17.5–0.010  Ma PreꞒ Ꞓ O S D C P T J K Pg N
Megatherium americanum skeleton, Natural History Museum, London
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Pilosa
Family:	† Megatheriidae
Subfamily:	† Megatheriinae Gill, 1872
Genera
† Anisodontherium † Diabolotherium † Eomegatherium † Eremotherium † Megathericulus † Megatheridium † Megatheriops † Megatherium † Ocnopus † Perezfontanatherium † Plesiomegatherium † Pliomegatherium † Proeremotherium † Promegatherium † Pyramiodontherium † Sibotherium [1] † Urumaquia

Megatheriinae is a subfamily of the Megatheriidae, an extinct family of ground sloths that lived from the Middle Miocene to the Early Holocene. ^{[2] [3]}

Classification

Within the Megatheriidae there are two (possibly three) subfamilies; the Megatheriinae and the Planopsinae. The phylogenetically older group is represented by the Planopsinae from the Lower and Middle Miocene. These still possessed a caniniform anterior tooth, which was separated from the posterior molar-like teeth by a small diastema . The more derived Megatheriinae, which are known from the Middle Miocene to the Early Holocene, on the other hand, had fully homodontic molars in a closed row. ^[4] Originally, the subfamilies of the Nothrotheriinae and the Schismotheriinae were also placed in the Megatheriidae. ^[5] Based on skull studies, the Nothrotheriidae, in which, among other genera, Nothrotherium , Nothrotheriops, and the semiaquatic Thalassocnus are placed, are regarded as a separate family, which forms the sister group of the Megatheriidae. ^[6]

Megatheriidae	Planopsinae Prepoplanops Planops Prepotherium Megatheriinae Diabolotherium Megathericulus Anisodontherium Pyramiodontherium Proeremotherium Eremotherium Megatherium

References

1. Rincón, Ascanio D.; Valerio, Ana L.; Laurito, César A.; Rincón, Ascanio D.; Valerio, Ana L.; Laurito, César A. (June 2020). "First fossil record of a Megatheriidae-Megatheriinae in the Early Hemphillian (Late Miocene) from San Gerardo de Limoncito, Curré Formation, Costa Rica". Revista Geológica de América Central (62): 1–24. doi:10.15517/rgac.v62i0.41278 (inactive 1 November 2024). ISSN   0256-7024.
2. Luliis, Gerardo De (1996). A systematic review of the Megatheriinae (Mammalia: Xenarthra Megatheriidae) (Thesis).
3. Varela, Luciano; Tambusso, P Sebastián; McDonald, H Gregory; Fariña, Richard A (2018-09-15). "Phylogeny, Macroevolutionary Trends and Historical Biogeography of Sloths: Insights From a Bayesian Morphological Clock Analysis" . Systematic Biology. 68 (2): 204–218. doi:10.1093/sysbio/syy058. ISSN   1063-5157. PMID   30239971.
4. Carlini, Alfredo A.; Brandoni, Diego; Dal Molin, Carlos N. (2013). "A new genus and species of Planopinae (Xenarthra: Tardigrada) from the Miocene of Santa Cruz Province, Argentina". Zootaxa. 3694 (6): 565–578. doi:10.11646/zootaxa.3694.6.4. hdl: 11336/18925 . ISSN   1175-5326. PMID   26312311.
5. McKenna, Malcolm C.; Bell, Susan K. (1997-10-17). Classification of Mammals: Above the Species Level. Columbia University Press. ISBN   978-0-231-52853-5.
6. Gaudin, T. J. (2004). "Phylogenetic relationships among sloths (Mammalia, Xenarthra, Tardigrada): The craniodental evidence". Zoological Journal of the Linnean Society. 140 (2): 255–305. doi: 10.1111/j.1096-3642.2003.00100.x .