Echimyini

Echimyini is a tribe of echimyid rodents, proposed in 2016, and containing 13 extant genera: all of the tree rats Echimys, Phyllomys, Makalata, Pattonomys, Toromys, Diplomys, Santamartamys, and Isothrix, the long recognized dactylomines Dactylomys, Olallamys, and Kannabateomys, and the enigmatic and previously classified as eumysopines Lonchothrix and Mesomys.[1][2] All these spiny rats genera are arboreal. Worth of note, the arboreal genus Callistomys – the painted-tree rat – does not belong to the tribe Echimyini. Because it is phylogenetically closer to Myocastor, Hoplomys, Proechimys, and Thrichomys than to the above-mentioned Echimyini genera, it is classified in the tribe Myocastorini.[3][2]

Echimyini
Mesomys hispidus
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Rodentia
Superfamily:	Octodontoidea
Family:	Echimyidae
Subfamily:	Echimyinae
Tribe:	Echimyini Fabre et al. 2016 [1]
Genera
Dactylomys Diplomys Echimys Isothrix Kannabateomys Lonchothrix Makalata Mesomys Olallamys Pattonomys Phyllomys Santamartamys Toromys

Phylogeny

Five assemblages can be distinguished in the genus-level cladogram of Echimyini:

• Echimys is closely related to Phyllomys, Makalata, Pattonomys and Toromys. This clade is in accordance with the fact that Phyllomys was classified within Echimys,[4] and that Pattonomys and Toromys were placed in Makalata.[5]
• Dactylomys, Olallamys, and Kannabateomys share unique features, and these South American bamboo rats are grouped under the informal clade name of "Dactylomyines".[1]
• Diplomys and Santamartamys are sister group, reflecting the fact that the latter genus has been split from the former.[6]
• Lonchothrix and Mesomys are sister group, and have often been classified within "Eumysopines", a subfamily otherwise shown to be polyphyletic.[1]
• Isothrix occupies an isolated, deep-branching position.

Genus-level cladogram of the Echimyini.

root                                                         Echimys       Phyllomys         Makalata                   Pattonomys       Toromys   (Giant tree-rat)           "Dactylomyines"                 Dactylomys       Olallamys         Kannabateomys   (Atlantic bamboo rat)           Diplomys       Santamartamys   (Red-crested tree-rat)           "Eumysopines"       Lonchothrix   (Tuft-tailed spiny tree-rat)       Mesomys           Isothrix

The cladogram has been reconstructed from mitochondrial and nuclear DNA characters.[7][8][9][10][11][3][12][13][2]

References

1. Fabre, Pierre-Henri; Patton, James L.; Leite, Yuri L. R. (2016). "Family Echimyidae (hutias, South American spiny-rats and coypu)". In Wilson, Don E.; Lacher, Thomas E. Jr; Mittermeier, Russell A. (eds.). Handbook of the Mammals of the World. Vol 6. Lagomorphs and Rodents I. Barcelona: Lynx Edicions. pp. 552–641. ISBN 978-84-941892-3-4.
2. Fabre, Pierre-Henri; Upham, Nathan S.; Emmons, Louise H.; Justy, Fabienne; Leite, Yuri L. R.; Loss, Ana Carolina; Orlando, Ludovic; Tilak, Marie-Ka; Patterson, Bruce D.; Douzery, Emmanuel J. P. (2017-03-01). "Mitogenomic Phylogeny, Diversification, and Biogeography of South American Spiny Rats". Molecular Biology and Evolution. 34 (3): 613–633. doi:10.1093/molbev/msw261. ISSN 0737-4038. PMID 28025278.
3. Loss, Ana; Moura, Raquel T.; Leite, Yuri L. R. (2014). "Unexpected phylogenetic relationships of the painted tree rat Callistomys pictus (Rodentia: Echimyidae)" (PDF). Natureza on Line. 12: 132–136.
4. Eisenberg, J. F.; Redford, K. H. (May 15, 2000). Mammals of the Neotropics, Volume 3: The Central Neotropics: Ecuador, Peru, Bolivia, Brazil. University of Chicago Press. pp. 487–488. ISBN 978-0-226-19542-1. OCLC 493329394.
5. Woods, C.A.; Kilpatrick, C.W. (2005). "Infraorder Hystricognathi". 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. 1538–1600. ISBN 978-0-8018-8221-0. OCLC 62265494.
6. Emmons, Louise Hickock (2005). "A revision of the genera of arboreal Echimyidae (Rodentia: Echimyidae, Echimyinae), with descriptions of two new genera". Mammalian Diversification: From Chromosomes to phylogeography (A Celebration of the Career of James L. Patton). 133. University of California Press. pp. 247–310. ISBN 9780520098534.
7. Lara, Márcia C.; Patton, James L.; da Silva, Maria Nazareth F. (1996). "The Simultaneous Diversification of South American Echimyid Rodents (Hystricognathi) Based on Complete Cytochrome b Sequences". Molecular Phylogenetics and Evolution. 5 (2): 403–413. doi:10.1006/mpev.1996.0035. PMID 8728398.
8. Leite, Yuri L. R.; Patton, James L. (2002). "Evolution of South American spiny rats (Rodentia, Echimyidae): the star-phylogeny hypothesis revisited". Molecular Phylogenetics and Evolution. 25 (3): 455–464. doi:10.1016/s1055-7903(02)00279-8.
9. Galewski, Thomas; Mauffrey, Jean-François; Leite, Yuri L. R.; Patton, James L.; Douzery, Emmanuel J. P. (2005). "Ecomorphological diversification among South American spiny rats (Rodentia; Echimyidae): a phylogenetic and chronological approach". Molecular Phylogenetics and Evolution. 34 (3): 601–615. doi:10.1016/j.ympev.2004.11.015. PMID 15683932.
10. Upham, Nathan S.; Patterson, Bruce D. (2012). "Diversification and biogeography of the Neotropical caviomorph lineage Octodontoidea (Rodentia: Hystricognathi)". Molecular Phylogenetics and Evolution. 63 (2): 417–429. doi:10.1016/j.ympev.2012.01.020. PMID 22327013.
11. Fabre, Pierre-Henri; Galewski, Thomas; Tilak, Marie-ka; Douzery, Emmanuel J. P. (2013-03-01). "Diversification of South American spiny rats (Echimyidae): a multigene phylogenetic approach". Zoologica Scripta. 42 (2): 117–134. doi:10.1111/j.1463-6409.2012.00572.x. ISSN 1463-6409.
12. Fabre, Pierre-Henri; Vilstrup, Julia T.; Raghavan, Maanasa; Der Sarkissian, Clio; Willerslev, Eske; Douzery, Emmanuel J. P.; Orlando, Ludovic (2014-07-01). "Rodents of the Caribbean: origin and diversification of hutias unravelled by next-generation museomics". Biology Letters. 10 (7): 20140266. doi:10.1098/rsbl.2014.0266. ISSN 1744-9561. PMC 4126619. PMID 25115033.
13. Upham, Nathan S.; Patterson, Bruce D. (2015). "Evolution of Caviomorph rodents: a complete phylogeny and timetree for living genera". In Vassallo, Aldo Ivan; Antenucci, Daniel (eds.). Biology of caviomorph rodents: diversity and evolution. Buenos Aires: SAREM Series A, Mammalogical Research — Sociedad Argentina para el Estudio de los Mamíferos. pp. 63–120.