Perimys
{{Short description|Extinct genus of rodents}}
{{Automatic taxobox
| fossil_range = Early-Late Miocene (Colhuehuapian-Huayquerian)
~{{fossil range|21.0|6.8}}
| image = Perimys tooth.png
| image_caption = Left m1 and m2 of Perimys sp.
| taxon = Perimys
| authority = Ameghino, 1887
| type_species = †Perimys erutus
| type_species_authority = Ameghino, 1887
| subdivision_ranks = Species
| subdivision = *P. ameghinoi {{small|Scott 1905}}
- P. dissimilis {{small|Ameghino 1902}}
- P. erutus {{small|Ameghino 1887}}
- P. impactus {{small|Ameghino 1894}}
- P. incavatus {{small|Ameghino 1902}}
- P. incurvus {{small|Ameghino 1902}}
- P. intermedius {{small|Kramarz 2002}}
- P. oemulus {{small|Ameghino 1894}}
- P. onustus {{small|Ameghino 1887}}
- P. pacificus {{small|Ameghino 1894}}
- P. perpinguis {{small|Ameghino 1891}}
- P. planaris {{small|Ameghino 1891}}
- P. puellus {{small|Ameghino 1891}}
- P. pueraster {{small|Ameghino 1891}}
- P. scalabrinianus {{small|Ameghino 1889}}
- P. transversus {{small|Ameghino 1902}}
| synonyms = Sphodromys {{small|Ameghino 1887}}
}}
Perimys is an extinct genus of neoepiblemid rodent that lived from the Early to Late Miocene in what is now South America. Fossils have been found in the Cerro Bandera,{{Cite journal |last1=Kramarz |first1=Alejandro |last2=Garrido |first2=Alberto |last3=Forasiepi |first3=Analía |last4=Bond |first4=Mariano |last5=Tambussi |first5=Claudia |date=2005 |title=Stratigraphy and vertebrates (Aves and Mammalia) from the Cerro Bandera Formation, Early Miocene of Neuquén Province, Argentina. |url=http://www.andeangeology.cl/index.php/revista1/article/view/V32n2-a06/html |journal=Revista Geológica de Chile |volume=32 |issue=2|doi=10.4067/S0716-02082005000200006|doi-access=free }} Cerro Boleadoras,{{Cite journal |last1=Vizcaino |first1=Sergio F. |last2=Bargo |first2=M. Susana |last3=Pérez |first3=M. Encarnación |last4=Aramendía |first4=Inés |last5=Cuitiño |first5=José I. |last6=Monsalvo |first6=Eduardo S. |last7=Vlachos |first7=Evangelos |last8=Noriega |first8=Jorge I. |last9=Kay |first9=Richard F. |date=2022-09-30 |title=Fossil vertebrates of the early-middle Miocene Cerro Boleadoras Formation, northwestern Santa Cruz Province, Patagonia, Argentina |url=http://www.andeangeology.cl/index.php/revista1/article/view/V49n3-3425 |journal=Andean Geology |language=en |volume=49 |issue=3 |pages=382–422 |doi=10.5027/andgeoV49n3-3425 |issn=0718-7106|doi-access=free|bibcode=2022AndGe..49..382V }}50x50px Material was copied from this source, which is available under a Creative Commons Attribution 3.0 International License Ituzaingó, Santa Cruz,{{Cite journal |last=Kramarz |first=Alejandro |date=2014-06-08 |title=Roedores chinchilloideos (Hystricognathi) de la Formación Pinturas, Mioceno temprano-medio de la provincia de Santa Cruz, Argentina |url=http://revista.macn.gob.ar/ojs/index.php/RevMus/article/view/9 |journal=Revista del Museo Argentino de Ciencias Naturales |series=Nueva Serie |volume=4 |issue=2 |pages=167–180 |issn=1853-0400}} and Sarmiento Formations of Argentina,{{Cite book |last1=Madden |first1=Richard H. |chapter-url=https://books.google.com/books?id=oY7wkK6lV4cC&q=Colhuehuapian+rodents+from+Gran+Barranca+and+other+Patagonian+localities%3A+the+state+of+the+art.&pg=PA206 |title=The Paleontology of Gran Barranca: Evolution and Environmental Change Through the Middle Cenozoic of Patagonia |last2=Carlini |first2=Alfredo A. |last3=Vucetich |first3=Maria Guiomar |last4=Kay |first4=Richard F. |date=2010-06-17 |publisher=Cambridge University Press |isbn=978-0-521-87241-6 |language=en |chapter=Colhuehuapian rodents from Gran Barranca and other Patagonian localities: the state of the art.}}
and the Galera,{{Cite journal |last1=McGrath |first1=Andrew J. |last2=Chick |first2=Jennifer |last3=Croft |first3=Darin A. |last4=Dodson |first4=Holly E. |last5=Flynn |first5=John J. |last6=Wyss |first6=André R. |date=2022-02-08 |title=Cavioids, Chinchilloids, and Erethizontoids (Hystricognathi, Rodentia, Mammalia) of the Early Miocene Pampa Castillo Fauna, Chile |journal=American Museum Novitates |issue=3984 |pages=1–46 |doi=10.1206/3984.1 |issn=0003-0082 |doi-access=free}} Santa Cruz{{Cite journal |last1=Bostelmann |first1=J. Enrique |last2=Roux |first2=Jacobous P. Le |last3=Vásquez |first3=Ana |last4=Gutiérrez |first4=Néstor M. |last5=Oyarzún |first5=José Luis |last6=Carreño |first6=Catalina |last7=Torres |first7=Teresa |last8=Otero |first8=Rodrigo |last9=Llanos |first9=Andrea |last10=Fanning |first10=C. Mark |last11=Hervé |first11=Francisco |date=2013-07-25 |title=Burdigalian deposits of the Santa Cruz Formation in the Sierra Baguales, Austral (Magallanes) Basin: Age, depositional environment and vertebrate fossils |url=http://www.andeangeology.cl/index.php/revista1/article/view/V40n3-a04 |journal=Andean Geology |language=en |volume=40 |issue=3 |pages=458–489 |doi=10.5027/andgeoV40n3-a04 |issn=0718-7106|doi-access=free|hdl=10533/138811 |hdl-access=free }} and Río Frías Formations of Chile.
Description
Perimys was a medium to large-sized rodent. Perimys can be distinguished from other caviomorphs in having euhypsodont and bilophodont cheek teeth, with the hypoflexus/id being conspicuously broader and filled with more cementum than in Prolagostomus and Pliolagostomus. As a result, the teeth of Perimys have a U-shape occlusal outline.
Taxonomy
Perimys was first described by Florentino Ameghino in 1887 based on remains found in the Santa Cruz Formation of Argentina, with the proposed type species being Perimys erutus. Several other species have been described as pertaining to this genus. Ameghino originally assigned it to the obsolete family Eryomyidae,{{Cite journal |last=Ameghino |first=Florentino |date=1891 |title=Nuevos restos de mamíferos fósiles descubiertos por Carlos Ameghino en el Eoceno inferior de la Patagonia austral. — Especies nuevas, adiciones y correcciones |url=https://www.biodiversitylibrary.org/part/76088 |journal=Revista argentina de historia natural |volume=1 |pages=289–328}} however, many later authors have assigned it to the Neoepiblemidae family.{{Cite journal |last1=Busker |first1=Felipe |last2=Dozo |first2=María Teresa |last3=Soto |first3=Ignacio María |date=2020-10-01 |title=New remains of Cephalomys arcidens (Rodentia, Caviomorpha) and a redefinition of the enigmatic Cephalomyidae |url=https://www.researchgate.net/publication/343807210 |journal=Journal of Systematic Palaeontology |volume=18 |issue=19 |pages=1589–1629 |doi=10.1080/14772019.2020.1796833 |bibcode=2020JSPal..18.1589B |s2cid=225308634 |issn=1477-2019}}{{Cite journal |last=Vucetich |first=María Guiomar |date=1989 |title=Rodents (Mammalia) of the Lacayani fauna revisited (Deseadan, Bolivia). Comparison with new Chinchillidae and Cephalomyidae from Argentina. |url=https://www.researchgate.net/publication/292546558 |journal=Bulletin du Muséum national d'histoire naturelle |volume=11 |issue=4 |pages=233–247}}
The following cladogram of the Caviomorpha is based on Busker et al. 2020, showing the position of Perimys.{{Cite journal |last1=Busker |first1=Felipe |last2=Dozo |first2=María Teresa |last3=Soto |first3=Ignacio María |date=2020-10-01 |title=New remains of Cephalomys arcidens (Rodentia, Caviomorpha) and a redefinition of the enigmatic Cephalomyidae |url=https://www.researchgate.net/publication/343807210 |journal=Journal of Systematic Palaeontology |volume=18 |issue=19 |pages=1589–1629 |doi=10.1080/14772019.2020.1796833 |bibcode=2020JSPal..18.1589B |s2cid=225308634 |issn=1477-2019}}
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