The long-furred Atlantic tree-rat or Thomas's Atlantic tree-rat (''Phyllomys medius''), is a spiny rat species found in

Brazil Brazil, officially the Federative Republic of Brazil, is the largest country in South America. It is the world's List of countries and dependencies by area, fifth-largest country by area and the List of countries and dependencies by population ...

. In recent years, this species have unveiled itself in different parts of Brazil where researchers and scientists are still closely looking into due to lack of knowledge on this species. The ''Phyllomys medius'' is closely related to two other species that have recently been connected to the long furred Atlantic tree rat due to similarities in physical characteristics and DNA. (Yuri et.al., 2008) (Edson et al., 2018)

References

Edson Fiedler de Abreu-Júnior, Alexandre Reis Percequillo, Lena Geise, Yuri L.R. Leite, Ana Carolina Loss. (2018) Unveiling the identity of Kerr's Atlantic tree rat, ''Phyllomys kerri'' (Rodentia, Echimyidae). ''Mammalian Biology, Vol. 92,'' 57-70. https://doi.org/10.1016/j.mambio.2018.03.008 Yuri L. R. Leite, Alexandre U. Christoff, Valéria Fagundes, A New Species of Atlantic Forest Tree Rat, Genus ''Phyllomys'' (Rodentia, Echimyidae) from Southern Brazil, ''Journal of Mammalogy'', Volume 89, Issue 4, 15 August 2008, Pages 845–851, https://doi.org/10.1644/07-MAMM-A-343.1 Phyllomys Mammals described in 1909 Taxa named by Oldfield Thomas {{Echimyidae-stub