Thylamys

Thylamys is a genus of opossums in the family Didelphidae. The premaxillae are rounded rather than pointed. The females lack a pouch. The females' nipples are arranged in two symmetrical rows on the abdomen.[2] All species but T. macrurus store fat in their tails.,[3] although this is not necessarily true for all species in the genus.[4] Fossils belonging to the genus date back to the Miocene, with the oldest specimens being found in the Cerro Azul Formation of Argentina and the Honda Group of Colombia.[5] Genetic studies indicate that the genus may have originated around 14 million years ago.[6]

Thylamys[1]
Temporal range: Mid Miocene (Colloncuran) to Recent
~14–0 Ma
Elegant fat-tailed mouse opossum
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Infraclass: Marsupialia
Order: Didelphimorphia
Family: Didelphidae
Subfamily: Didelphinae
Tribe: Thylamyini
Genus: Thylamys
Gray, 1843
Type species
Didelphis elegans
Species

See text

Taxonomy

Cladogram of living Thylamys species.[7][8]

 
 
 

T. karimii (Petter 1968) Reig, Kirsch & Marshall 1987 (Karimi's fat-tailed mouse opossum)

 
 

T. velutinus (Wagner 1842) Miranda-Ribeiro 1936 (Dwarf fat-tailed mouse opossum)

 
 
 
 
 

T. tatei (Handley 1957) Reig, Kirsch & Marshall 1987 (Tate's fat-tailed mouse opossum)

 
 
 

T. elegans (Waterhouse 1839) Gray 1843b (Elegant fat-tailed mouse opossum)

 
 

T. pallidior (Thomas 1902) Gardner & Creighton 1989 (White-bellied fat-tailed mouse opossum)

 
 
 
 
 
 

T. citellus (Thomas 1912c) [9]

 
 
 

T. pulchellus (Cabrera 1934) [10] (Argentine fat-tailed mouse opossum)

 
 

T. pusillus (Desmarest 1804) Reig, Kirsch & Marshall 1987 (Common fat-tailed mouse opossum)

 
 
 
 
 

T. macrurus (Olfers 1818) Gardner & Creighton 1989 (Paraguayan fat-tailed mouse opossum)

 
 
 

T. venustus Thomas 1902 (Buff-bellied fat-tailed mouse opossum)

 
 
 

T. cinderella (Thomas 1902) Flores, Díaz & Barquez 2000 (Cinderella fat-tailed mouse opossum)

 
 

T. sponsorius (Thomas 1921) Flores, Díaz & Barquez 2000 (Argentine fat-tailed mouse opossum)

 
 
 
 
 
 
 

Other species of Thylamys.[11]

  • †T. colombianus Goin 1997
  • T. fenestrae (Marelli 1932) [12]
  • †T. minutus Goin 1997
  • †T. pinei Goin, Montalvo & Visconti 2000
  • †T. zettii Goin 1997

References
  1. Gardner, A.L. (2005). "Order Didelphimorphia". In Wilson, D.E.; Reeder, D.M (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. pp. 17–18. ISBN 978-0-8018-8221-0. OCLC 62265494.
  2. Eisenberg, John Frederick; Redford, Kent Hubbard (1999). Mammals of the Neotropics: The Central Neotropics: Ecuador, Peru, Bolivia, Brazil. University of Chicago Press. p. 624. ISBN 978-0-226-19542-1.
  3. Gardner, Alfred L. (2008). Mammals of South America: Marsupials, xenarthrans, shrews, and bats. University of Chicago Press. p. 669. ISBN 978-0-226-28240-4.
  4. Voss, R.S. & Jansa, S.A. (2003). "Nonmolecular data and new IRBP sequences: separate and combined analyses of didelphine relationships with denser taxon sampling". Bulletin of the American Museum of Natural History. 276: 1–82. doi:10.1206/0003-0090(2003)276<0001:PSODMI>2.0.CO;2. hdl:2246/444.
  5. Braun, J.K.; et al. (2005). "Phylogenetic and biogeographic relationships of mouse opossums Thylamys (Didelphimorphia, Didelphidae) in southern South America". Journal of Mammalogy. 86 (1): 147–159. doi:10.1644/1545-1542(2005)086<0147:PABROM>2.0.CO;2.
  6. Steiner, C.; et al. (2005). "New DNA data from transthyretin nuclear intron suggest an Oligocene to Miocene diversification of living South American opossums (Marsupialia: Didelphidae)". Molecular Phylogenetics and Evolution. 35 (2): 363–379. doi:10.1016/j.ympev.2004.12.013. PMID 15804409.
  7. Upham, Nathan S.; Esselstyn, Jacob A.; Jetz, Walter (2019). "Inferring the mammal tree: Species-level sets of phylogenies for questions in ecology, evolution and conservation". PLOS Biol. 17 (12): e3000494. doi:10.1371/journal.pbio.3000494. PMC 6892540. PMID 31800571.
  8. Amador, Lucila I.; Giannini, Norberto P. (2016). "Phylogeny and evolution of body mass in didelphid marsupials (Marsupialia: Didelphimorphia: Didelphidae)". Organisms Diversity & Evolution. 16 (3): 641–657. doi:10.1007/s13127-015-0259-x. S2CID 17393886.
  9. Flores, D.; Teta, P. (2016). "Thylamys citellus". IUCN Red List of Threatened Species. 2016: e.T199835A22172943. doi:10.2305/IUCN.UK.2016-2.RLTS.T199835A22172943.en. Retrieved 9 January 2020.
  10. Flores, D.; Teta, P. (2016). "Thylamys pulchellus". IUCN Red List of Threatened Species. 2016: e.T199834A22172571. doi:10.2305/IUCN.UK.2016-2.RLTS.T199834A22172571.en. Retrieved 9 January 2020.
  11. Thylamys at Fossilworks.org
  12. Martin, G.M.; Flores, D. (2016). "Thylamys fenestrae". IUCN Red List of Threatened Species. 2016: e.T199836A22172852. doi:10.2305/IUCN.UK.2016-2.RLTS.T199836A22172852.en. Retrieved 9 January 2020.


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