'''''Meizonyx''''' is an extinct genus of [[Megalonychidae|megalonychid]] [[ground sloth]] from the Pleistocene of [[El Salvador]] and southern [[Mexico]]. The type and only species, ''Meizonyx salvadorensis,'' was described in 1985 from a mandible found in Barranca del Sisimico and other remains found at Rio Tomayate in El Salvador considered to be [[Middle Pleistocene]] in age.<ref>S. D. Webb and S. C. Perrigo. 1985. New megalonychid sloths from El Salvador. ''The evolution and ecology of armadillos, sloths, and vermilinguas'' 113-120</ref> Later, in 2021, atwo partial skeletonskeletons waswere described from Late Pleistocene aged deposits in [[Sistema Huautla]] cave in, Oxaca, Mexico, with one of these dating to around 12,562 ± 130 years [[Before Present|BP]]. It is considered closely related to ''[[Xibalbaonyx]].''<ref>{{Cite journal|last1=McDonald|first1=H. Gregory|last2=Arroyo-Cabrales|first2=Joaquín|last3=Alarcón-Durán|first3=Iván|last4=Espinosa-Martínez|first4=Deborah V.|date=2020-11-16|title=First record of Meizonyx salvadorensis (Mammalia: Xenarthra: Pilosa) from the late Pleistocene of Mexico and its evolutionary implications|url=https://www.tandfonline.com/doi/full/10.1080/14772019.2020.1842816|journal=Journal of Systematic Palaeontology|language=en|volume=18|issue=22|pages=1829–1851|doi=10.1080/14772019.2020.1842816|s2cid=231636912 |issn=1477-2019}}</ref> It is thought to be comparable or somewhat greater in size than ''[[Megalonyx|Megalonyx jeffersonii]].'' It inhabited relatively mountainous areas.<ref>McDonald, H. G. 2021. Yukon to the Yucatan: Habitat partitioning in North American Late Pleistocene Ground Sloths (Xenarthra, Pilosa). Journal of Palaeosciences 70: 237–251.</ref>
