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Irenomys

January 01, 1970

Irenomys tarsalis, also known as the Chilean climbing mouse,[1] Chilean tree mouse,[2] or long-footed irenomys,[3] is a rodent found in Chile, from about 36° to 46°S, and in adjacent Argentina, mainly in forests. It is a large, long-tailed, soft-furred mouse characterized by grooved upper incisors and specialized molars with transverse ridges, divided by deep valleys, which are connected by a transverse ridge along the midline of the molars.

Irenomys
Temporal range: Recent
↓
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Cricetidae
Subfamily: Sigmodontinae
Genus: Irenomys
Thomas, 1919
Species:
I. tarsalis
Binomial name
Irenomys tarsalis
(Philippi, 1900)
Synonyms

Mus tarsalis Philippi, 1900
Reithrodon longicaudatus Philippi, 1900
Irenomys longicaudatus: Thomas, 1919
Irenomys tarsalis: Osgood, 1943

I. tarsalis is a docile, herbivorous animal that lives in trees. It is so distinct from other species that it was placed in its own genus, Irenomys, in 1919. The name comes from the Ancient Greek word εἰρήνη (iren) meaning "peace", in reference to the end of World War I. Although it has been generally placed in the tribe Phyllotini, genetic evidence does not support any close relationships with other genera, so that it is now classified as a member of the subfamily Sigmodontinae incertae sedis (of uncertain position).

Taxonomy edit

In 1900, Rodolfo Armando Philippi named both Mus tarsalis (from Valdivia Province in mainland Chile) and Reithrodon longicaudatus (from a small island near Chiloé),[4] both of which are now classified as Irenomys tarsalis.[2] Philippi's Reithrodon longicaudatus was transferred into a new genus, Irenomys, by Oldfield Thomas in February 1919. The name, which means "peace mouse" in Greek, referred to the end of World War I four months before.[5] Another of the species Philippi described in 1900, Mus mochae, was later transferred to Irenomys because of a mismatch between the skin and skull,[6] but it is in fact a member of the genus Abrothrix and not closely related to Irenomys.[7] In his 1943 work on The mammals of Chile, Wilfred Hudson Osgood recognized the close relation between Philippi's Mus tarsalis and Reithrodon longicaudatus and referred them to a single species, then called Irenomys tarsalis.[8] Osgood retained two subspecies, Irenomys tarsalis tarsalis on the mainland and Irenomys tarsalis longicaudatus on Chiloé and nearby islands, on the basis of slight differences in pelage coloration. In the few mature specimens of the latter subspecies that Osgood had, the underparts are somewhat lighter than in examples of I. t. tarsalis, which has a pinkish color in the underparts, but Osgood stressed that further material could well indicate that the two forms could not be distinguished.[4]

In his description of the genus, Thomas opined that Irenomys is most closely related to Phyllotis.[5] The group of genera related to Phyllotis was later formalized as the tribe Phyllotini, and Irenomys was often included there, but also excluded from it by some authors.[9] In 1995, a cladistic analysis of Phyllotini on the basis of morphology provided evidence in favor of placement of Irenomys in the group, with some support for a close relation to Andinomys.[10] From 1999 on, DNA sequence data cast doubt on this assignment, as studies using the mitochondrial cytochrome b gene and the nuclear IRBP gene placed Irenomys in a variety of positions, all outside Phyllotini, with Scolomys, Sigmodon, Euneomys, and various large clades of sigmodontines all as sister groups in some analyses.[11] Accordingly, it is now classified outside Phyllotini and considered as Sigmodontinae incertae sedis.[3]

Description edit

Irenomys is a large mouse with a long, hairy tail, large eyes, and long and soft fur.[2] The upperparts are rufous with fine dark lines and the underparts are buff, with the exact color varying by subspecies.[12] The densely haired ears are medium-sized and blackish in color. The feet, which are large and broad, are nearly white. The tail, which ends in a slight pencil, is dark brown, with a somewhat lighter area present on the ventral side in some individuals.[13] The total length is 270 to 326 millimetres (10.63 to 12.83 in), averaging 280 millimetres (11.02 in), the tail length is 162 to 196 millimetres (6.38 to 7.72 in), averaging 165 millimetres (6.50 in), the hindfoot length is 28 to 32 millimetres (1.10 to 1.26 in), averaging 30 millimetres (1.18 in), the ear length is 20 to 25 millimetres (0.79 to 0.98 in), averaging 22 millimetres (0.87 in), and weight is 40 to 59 grams (1.4 to 2.1 oz), averaging 42 grams (1.5 oz).[2] The karyotype includes 64 chromosomes, with a fundamental number (FN) of 98.[14]

The skull resembles that of some Rhipidomys species. The interorbital region is narrow and the incisive foramina are long, extending between the first molars.[13] The upper incisors are deeply grooved. The molars are strongly hypsodont (high-crowned) and consist of transverse, diamond-shaped laminae (plates), separated by deep valleys, which are joined at the midline by narrow ridges, similar to those of the African elephant.[15]

Distribution and ecology edit

Irenomys tarsalis is restricted to forested habitats in Chile and western Argentina. In the northern part of its range, its distribution falls into two segments, one in coastal Chile and one further east in Chile and in adjacent Argentina, both of which extend north to about 36°S. Further south, it also occurs in Chile and adjacent Argentina, and also on numerous Chilean islands, including Chiloé. The southernmost records are at about 46°S.[16] No fossils are known.[2] It generally occurs in humid and densely forested habitats, often with bamboo vegetations, but a specimen has been reported from riparian vegetation at a small stream near the southern limit of its distribution and it is also found in unforested steppe habitat with scattered Austrocedrus chilensis trees.[17] It does not occur on high elevations.[18] It was a common species during a population peak of small rodents evidently caused by the flowering of quila (Chusquea quila) bamboo.[13]

It is found in association with other rodents such as Abrothrix olivaceus, Abrothrix longipilis, Oligoryzomys longicaudatus, Geoxus valdivianus, and Auliscomys pictus, as well as the marsupials Rhyncholestes raphanurus and Dromiciops gliroides.[19] Remains of Irenomys have been found in owl pellets of the great horned owl (Bubo virginianus),[19] rufous-legged owl (Strix rufipes),[20] and barn owl (Tyto alba); other potential predators include another owl, the Austral pygmy-owl (Glaucidium nanum), and the South American gray fox (Pseudalopex griseus), Darwin's fox (Pseudalopex fulvipes) and Kodkod (Leopardus guigna).[19]

Natural history and behavior edit

Irenomys lives mainly in trees, but has also been caught on the ground.[13] It climbs by moving both forefeet and both hindfeet alternately. It is docile, but will not readily enter a trap.[19] The breeding season is in the Southern Hemisphere spring, extending into late summer. Litter size is three to six.[21] The animal mostly eats seeds and fruits, but its diet also includes various other plant and fungal materials.[19]

Conservation status edit

Irenomys is not currently threatened and it is classified as "least concern" by the International Union for Conservation of Nature. It occurs in several protected areas, but destruction of its forest habitat may pose a threat to some populations.[1]

References edit

  1. ^ a b c Pardinas et al., 2008
  2. ^ a b c d e Kelt, 1993, p. 1
  3. ^ a b Musser and Carleton, 2005, p. 1121
  4. ^ a b Osgood, 1943, p. 220
  5. ^ a b Thomas, 1919, p. 201
  6. ^ Osgood, 1943, pp. 171–172
  7. ^ Musser and Carleton, 2005, p. 1090
  8. ^ Osgood, 1943, p. 219
  9. ^ Steppan, 1995, pp. 6–7
  10. ^ Steppan, 1995, figs. 22–24
  11. ^ Smith and Patton, 1999; D'Elía et al., 2003; D'Elía, 2003; D'Elía et al., 2006
  12. ^ Osgood, 1943, pp. 218, 220
  13. ^ a b c d Osgood, 1943, p. 218
  14. ^ Ojeda et al., 2004
  15. ^ Osgood, 1943, p. 218; Steppan, 1995, fig. 40; Hershkovitz, 1962, pp. 93–95; Thomas, 1919, p. 201
  16. ^ Kelt, 1993, p. 2; Kelt et al., 2006, p. 126
  17. ^ Kelt, 1993, p. 2; Kelt et al., 2006
  18. ^ Kelt, 1993, pp. 2–3
  19. ^ a b c d e Kelt, 1993, p. 3
  20. ^ Martínez, 1993, p. 214
  21. ^ Kelt, 1993, p. 2

Literature cited edit

  • D'Elía, G., Luna, L., González, E.M. and Patterson, B.D. 2006. On the sigmodontine radiation (Rodentia, Cricetidae): An appraisal of the phylogenetic position of Rhagomys. Molecular Phylogenetics and Evolution 38:558–564
  • D'Elía, G., González, E.M. and Pardiñas, U.F.J. 2003. Phylogenetic analysis of sigmodontine rodents (Muroidea), with special reference to the akodont genus Deltamys. Mammalian Biology 68:351–364.
  • D'Elía, G. 2003. Phylogenetics of Sigmodontinae (Rodentia, Muroidea, Cricetidae), with special reference to the akodont group, and with additional comments on historical biogeography. Cladistics 19:307–323.
  • Hershkovitz, P. 1962. Evolution of Neotropical cricetine rodents (Muridae) with special reference to the phyllotine group. Fieldiana Zoology 46:1–524.
  • Kelt, D.A. 1993. . Mammalian Species 447:1–3.
  • Kelt, D.A., Engilis, A. Jr., Torres, I.E. and Hitch, A.T. 2006. Ecologically significant range extension for the Chilean tree mouse, Irenomys tarsalis. Mastozoología Neotropical 15(1):125–128.
  • Martínez, D.R. 1993. Food habits of the rufous-legged owl (Strix rufipes) in temperate rainforests of southern Chile. Journal of Raptor Research 27(4):214–216.
  • Musser, G.G. and Carleton, M.D. 2005. Superfamily Muroidea. Pp. 894–1531 in Wilson, D.E. and Reeder, D.M. (eds.). Mammal Species of the World: a taxonomic and geographic reference. 3rd ed. Baltimore: The Johns Hopkins University Press, 2 vols., 2142 pp. ISBN 978-0-8018-8221-0
  • Ojeda, A.A., Ríos, C.A. and Gallardo, M.H. 2004. Chromosomal characterization of Irenomys tarsalis (Rodentia, Cricetidae, Sigmodontinae). Mastozoología Neotropical 11(1):95–98.
  • Osgood, W.H. 1943. The mammals of Chile. Fieldiana Zoology 30:1–268.
  • Pardinas, U., Patterson, B., D'Elia, G. and Teta, P. 2008. Irenomys tarsalis. In IUCN. IUCN Red List of Threatened Species. Version 2009.2. <>. Downloaded on November 6, 2009.
  • Smith, M.F. and Patton, J.L. 1999. Phylogenetic relationships and the radiation of sigmodontine rodents in South America: Evidence from cytochrome b. Journal of Mammalian Evolution 6(2):89–128.
  • Steppan, S.J. 1995. Revision of the tribe Phyllotini (Rodentia: Sigmodontinae), with a phylogenetic hypothesis for the Sigmodontinae. Fieldiana Zoology 80:1–112.
  • Thomas, O. 1919. On small mammals collected by Sr. E. Budin in North-western Patagonia. Annals and Magazine of Natural History (9)3:199–212.

January 01, 1970
irenomys, tarsalis, also, known, chilean, climbing, mouse, chilean, tree, mouse, long, footed, irenomys, rodent, found, chile, from, about, adjacent, argentina, mainly, forests, large, long, tailed, soft, furred, mouse, characterized, grooved, upper, incisors,. Irenomys tarsalis also known as the Chilean climbing mouse 1 Chilean tree mouse 2 or long footed irenomys 3 is a rodent found in Chile from about 36 to 46 S and in adjacent Argentina mainly in forests It is a large long tailed soft furred mouse characterized by grooved upper incisors and specialized molars with transverse ridges divided by deep valleys which are connected by a transverse ridge along the midline of the molars IrenomysTemporal range Recent PreꞒ Ꞓ O S D C P T J K Pg N Conservation status Least Concern IUCN 3 1 1 Scientific classification Domain Eukaryota Kingdom Animalia Phylum Chordata Class Mammalia Order Rodentia Family Cricetidae Subfamily Sigmodontinae Genus IrenomysThomas 1919 Species I tarsalis Binomial name Irenomys tarsalis Philippi 1900 Synonyms Mus tarsalis Philippi 1900 Reithrodon longicaudatus Philippi 1900 Irenomys longicaudatus Thomas 1919 Irenomys tarsalis Osgood 1943 I tarsalis is a docile herbivorous animal that lives in trees It is so distinct from other species that it was placed in its own genus Irenomys in 1919 The name comes from the Ancient Greek word eἰrhnh iren meaning peace in reference to the end of World War I Although it has been generally placed in the tribe Phyllotini genetic evidence does not support any close relationships with other genera so that it is now classified as a member of the subfamily Sigmodontinae incertae sedis of uncertain position Contents 1 Taxonomy 2 Description 3 Distribution and ecology 4 Natural history and behavior 5 Conservation status 6 References 7 Literature citedTaxonomy editIn 1900 Rodolfo Armando Philippi named both Mus tarsalis from Valdivia Province in mainland Chile and Reithrodon longicaudatus from a small island near Chiloe 4 both of which are now classified as Irenomys tarsalis 2 Philippi s Reithrodon longicaudatus was transferred into a new genus Irenomys by Oldfield Thomas in February 1919 The name which means peace mouse in Greek referred to the end of World War I four months before 5 Another of the species Philippi described in 1900 Mus mochae was later transferred to Irenomys because of a mismatch between the skin and skull 6 but it is in fact a member of the genus Abrothrix and not closely related to Irenomys 7 In his 1943 work on The mammals of Chile Wilfred Hudson Osgood recognized the close relation between Philippi s Mus tarsalis and Reithrodon longicaudatus and referred them to a single species then called Irenomys tarsalis 8 Osgood retained two subspecies Irenomys tarsalis tarsalis on the mainland and Irenomys tarsalis longicaudatus on Chiloe and nearby islands on the basis of slight differences in pelage coloration In the few mature specimens of the latter subspecies that Osgood had the underparts are somewhat lighter than in examples of I t tarsalis which has a pinkish color in the underparts but Osgood stressed that further material could well indicate that the two forms could not be distinguished 4 In his description of the genus Thomas opined that Irenomys is most closely related to Phyllotis 5 The group of genera related to Phyllotis was later formalized as the tribe Phyllotini and Irenomys was often included there but also excluded from it by some authors 9 In 1995 a cladistic analysis of Phyllotini on the basis of morphology provided evidence in favor of placement of Irenomys in the group with some support for a close relation to Andinomys 10 From 1999 on DNA sequence data cast doubt on this assignment as studies using the mitochondrial cytochrome b gene and the nuclear IRBP gene placed Irenomys in a variety of positions all outside Phyllotini with Scolomys Sigmodon Euneomys and various large clades of sigmodontines all as sister groups in some analyses 11 Accordingly it is now classified outside Phyllotini and considered as Sigmodontinae incertae sedis 3 Description editIrenomys is a large mouse with a long hairy tail large eyes and long and soft fur 2 The upperparts are rufous with fine dark lines and the underparts are buff with the exact color varying by subspecies 12 The densely haired ears are medium sized and blackish in color The feet which are large and broad are nearly white The tail which ends in a slight pencil is dark brown with a somewhat lighter area present on the ventral side in some individuals 13 The total length is 270 to 326 millimetres 10 63 to 12 83 in averaging 280 millimetres 11 02 in the tail length is 162 to 196 millimetres 6 38 to 7 72 in averaging 165 millimetres 6 50 in the hindfoot length is 28 to 32 millimetres 1 10 to 1 26 in averaging 30 millimetres 1 18 in the ear length is 20 to 25 millimetres 0 79 to 0 98 in averaging 22 millimetres 0 87 in and weight is 40 to 59 grams 1 4 to 2 1 oz averaging 42 grams 1 5 oz 2 The karyotype includes 64 chromosomes with a fundamental number FN of 98 14 The skull resembles that of some Rhipidomys species The interorbital region is narrow and the incisive foramina are long extending between the first molars 13 The upper incisors are deeply grooved The molars are strongly hypsodont high crowned and consist of transverse diamond shaped laminae plates separated by deep valleys which are joined at the midline by narrow ridges similar to those of the African elephant 15 Distribution and ecology editIrenomys tarsalis is restricted to forested habitats in Chile and western Argentina In the northern part of its range its distribution falls into two segments one in coastal Chile and one further east in Chile and in adjacent Argentina both of which extend north to about 36 S Further south it also occurs in Chile and adjacent Argentina and also on numerous Chilean islands including Chiloe The southernmost records are at about 46 S 16 No fossils are known 2 It generally occurs in humid and densely forested habitats often with bamboo vegetations but a specimen has been reported from riparian vegetation at a small stream near the southern limit of its distribution and it is also found in unforested steppe habitat with scattered Austrocedrus chilensis trees 17 It does not occur on high elevations 18 It was a common species during a population peak of small rodents evidently caused by the flowering of quila Chusquea quila bamboo 13 It is found in association with other rodents such as Abrothrix olivaceus Abrothrix longipilis Oligoryzomys longicaudatus Geoxus valdivianus and Auliscomys pictus as well as the marsupials Rhyncholestes raphanurus and Dromiciops gliroides 19 Remains of Irenomys have been found in owl pellets of the great horned owl Bubo virginianus 19 rufous legged owl Strix rufipes 20 and barn owl Tyto alba other potential predators include another owl the Austral pygmy owl Glaucidium nanum and the South American gray fox Pseudalopex griseus Darwin s fox Pseudalopex fulvipes and Kodkod Leopardus guigna 19 Natural history and behavior editIrenomys lives mainly in trees but has also been caught on the ground 13 It climbs by moving both forefeet and both hindfeet alternately It is docile but will not readily enter a trap 19 The breeding season is in the Southern Hemisphere spring extending into late summer Litter size is three to six 21 The animal mostly eats seeds and fruits but its diet also includes various other plant and fungal materials 19 Conservation status editIrenomys is not currently threatened and it is classified as least concern by the International Union for Conservation of Nature It occurs in several protected areas but destruction of its forest habitat may pose a threat to some populations 1 References edit a b c Pardinas et al 2008 a b c d e Kelt 1993 p 1 a b Musser and Carleton 2005 p 1121 a b Osgood 1943 p 220 a b Thomas 1919 p 201 Osgood 1943 pp 171 172 Musser and Carleton 2005 p 1090 Osgood 1943 p 219 Steppan 1995 pp 6 7 Steppan 1995 figs 22 24 Smith and Patton 1999 D Elia et al 2003 D Elia 2003 D Elia et al 2006 Osgood 1943 pp 218 220 a b c d Osgood 1943 p 218 Ojeda et al 2004 Osgood 1943 p 218 Steppan 1995 fig 40 Hershkovitz 1962 pp 93 95 Thomas 1919 p 201 Kelt 1993 p 2 Kelt et al 2006 p 126 Kelt 1993 p 2 Kelt et al 2006 Kelt 1993 pp 2 3 a b c d e Kelt 1993 p 3 Martinez 1993 p 214 Kelt 1993 p 2Literature cited editD Elia G Luna L Gonzalez E M and Patterson B D 2006 On the sigmodontine radiation Rodentia Cricetidae An appraisal of the phylogenetic position of Rhagomys Molecular Phylogenetics and Evolution 38 558 564 D Elia G Gonzalez E M and Pardinas U F J 2003 Phylogenetic analysis of sigmodontine rodents Muroidea with special reference to the akodont genus Deltamys Mammalian Biology 68 351 364 D Elia G 2003 Phylogenetics of Sigmodontinae Rodentia Muroidea Cricetidae with special reference to the akodont group and with additional comments on historical biogeography Cladistics 19 307 323 Hershkovitz P 1962 Evolution of Neotropical cricetine rodents Muridae with special reference to the phyllotine group Fieldiana Zoology 46 1 524 Kelt D A 1993 Irenomys tarsalis Mammalian Species 447 1 3 Kelt D A Engilis A Jr Torres I E and Hitch A T 2006 Ecologically significant range extension for the Chilean tree mouse Irenomys tarsalis Mastozoologia Neotropical 15 1 125 128 Martinez D R 1993 Food habits of the rufous legged owl Strix rufipes in temperate rainforests of southern Chile Journal of Raptor Research 27 4 214 216 Musser G G and Carleton M D 2005 Superfamily Muroidea Pp 894 1531 in Wilson D E and Reeder D M eds Mammal Species of the World a taxonomic and geographic reference 3rd ed Baltimore The Johns Hopkins University Press 2 vols 2142 pp ISBN 978 0 8018 8221 0 Ojeda A A Rios C A and Gallardo M H 2004 Chromosomal characterization of Irenomys tarsalis Rodentia Cricetidae Sigmodontinae Mastozoologia Neotropical 11 1 95 98 Osgood W H 1943 The mammals of Chile Fieldiana Zoology 30 1 268 Pardinas U Patterson B D Elia G and Teta P 2008 Irenomys tarsalis In IUCN IUCN Red List of Threatened Species Version 2009 2 lt www iucnredlist org gt Downloaded on November 6 2009 Smith M F and Patton J L 1999 Phylogenetic relationships and the radiation of sigmodontine rodents in South America Evidence from cytochrome b Journal of Mammalian Evolution 6 2 89 128 Steppan S J 1995 Revision of the tribe Phyllotini Rodentia Sigmodontinae with a phylogenetic hypothesis for the Sigmodontinae Fieldiana Zoology 80 1 112 Thomas O 1919 On small mammals collected by Sr E Budin in North western Patagonia Annals and Magazine of Natural History 9 3 199 212 Retrieved from https en wikipedia org w index php title Irenomys amp oldid 1152712811, wikipedia, wiki, book, books, library,

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