Calomys cerqueirai is a species of rodent in the genus Calomys from southeastern Brazil. Distinct from other Calomys in its karyotype and characters of the fur, it is known only from two places in Minas Gerais. The karyotype was first described in 1996 and the species was formally named in 2010.
In 1996, Geise and coworkers described a new karyotypic variant of Calomys from Lagoa Santa, Minas Gerais with 36 chromosomes and a fundamental number of 66 autosomal arms (2n = 36, FNa = 66), and a 2007 genetic analysis confirmed that the new variant represents an evolutionary lineage separate from other Calomys species.[1] In 2010, Bonvicino and others described another karyotypic variant from Capitão Andrade, also in Minas Gerais, with 2n = 38 and FNa = 66, and concluded that both karyotypic variants represented a single, previously undescribed species, which they named Calomys cerqueirai. The specific name honors Brazilian mammalogist Rui Cerqueira. A single fusion or fission event is sufficient to derive one of the two karyotypes from the other.[2]
Calomys cerqueirai is a relatively small member of the Sigmodontinae, but is large for a Calomys. The upperparts are yellowish brown, becoming lighter towards the sides; this coloration is sharply delineated from the whitish underparts. The external ears (pinnae) are small and rounded and have a patch of white hair behind them. The tail, which is dark above and white below, is relatively short. The feet are fairly long and narrow and are covered above by white hairs.[4] In two specimens from Capitão Andrade, the head and body length is 86 to 112 mm (3.4 to 4.4 in), the tail length is 75 to 85 mm (3.0 to 3.3 in), the hindfoot length is 21 to 22 mm (0.83 to 0.87 in), the ear length is 16 to 18 mm (0.63 to 0.71 in), and the body mass is 25 to 35 g (0.88 to 1.23 oz).[5]
In the skull, the front region (rostrum) is short and the braincase is broadened. The incisive foramina are long, extending between the first molars. The palate itself is also long, extending beyond the third molars, and near the third molars is perforated by a pair of posterolateral palatal pits.[6] The cutting faces of the upper incisors are inclined backwards (opisthodont). The upper third molars are reduced in size.[7]
It differs from other Calomys by its karyotype and by characters of the fur.[8]
Ecology and behavioredit
The species is known from two localities in Minas Gerais, southeastern Brazil, near the border of the Atlantic Forest and Cerrado biomes.[9] Both specimens from Capitão Andrade were caught in grass near a stream. The species is infected by species of Taenia and Hepsilon and unidentified nematodes.[10]
Wikispecies has information related to Calomys cerqueirai.
Bonvicino, C.R., de Oliveira, J.A. and Gentile, R. 2010. A new species of Calomys (Rodentia: Sigmodontinae) from southeastern Brazil. Zootaxa 2336:19–35.
May 07, 2024
calomys, cerqueirai, species, rodent, genus, calomys, from, southeastern, brazil, distinct, from, other, calomys, karyotype, characters, known, only, from, places, minas, gerais, karyotype, first, described, 1996, species, formally, named, 2010, scientific, cl. Calomys cerqueirai is a species of rodent in the genus Calomys from southeastern Brazil Distinct from other Calomys in its karyotype and characters of the fur it is known only from two places in Minas Gerais The karyotype was first described in 1996 and the species was formally named in 2010 Calomys cerqueirai Scientific classification Domain Eukaryota Kingdom Animalia Phylum Chordata Class Mammalia Order Rodentia Family Cricetidae Subfamily Sigmodontinae Genus Calomys Species C cerqueirai Binomial name Calomys cerqueiraiBonvicino de Oliveira and Gentile 2010 Contents 1 Taxonomy 2 Description 3 Ecology and behavior 4 References 5 Literature citedTaxonomy editIn 1996 Geise and coworkers described a new karyotypic variant of Calomys from Lagoa Santa Minas Gerais with 36 chromosomes and a fundamental number of 66 autosomal arms 2n 36 FNa 66 and a 2007 genetic analysis confirmed that the new variant represents an evolutionary lineage separate from other Calomys species 1 In 2010 Bonvicino and others described another karyotypic variant from Capitao Andrade also in Minas Gerais with 2n 38 and FNa 66 and concluded that both karyotypic variants represented a single previously undescribed species which they named Calomys cerqueirai The specific name honors Brazilian mammalogist Rui Cerqueira A single fusion or fission event is sufficient to derive one of the two karyotypes from the other 2 According to evidence from the mitochondrial cytochrome b gene Calomys cerqueirai is sister to a group of four other species within a clade of large bodied Calomys 3 Description editCalomys cerqueirai is a relatively small member of the Sigmodontinae but is large for a Calomys The upperparts are yellowish brown becoming lighter towards the sides this coloration is sharply delineated from the whitish underparts The external ears pinnae are small and rounded and have a patch of white hair behind them The tail which is dark above and white below is relatively short The feet are fairly long and narrow and are covered above by white hairs 4 In two specimens from Capitao Andrade the head and body length is 86 to 112 mm 3 4 to 4 4 in the tail length is 75 to 85 mm 3 0 to 3 3 in the hindfoot length is 21 to 22 mm 0 83 to 0 87 in the ear length is 16 to 18 mm 0 63 to 0 71 in and the body mass is 25 to 35 g 0 88 to 1 23 oz 5 In the skull the front region rostrum is short and the braincase is broadened The incisive foramina are long extending between the first molars The palate itself is also long extending beyond the third molars and near the third molars is perforated by a pair of posterolateral palatal pits 6 The cutting faces of the upper incisors are inclined backwards opisthodont The upper third molars are reduced in size 7 It differs from other Calomys by its karyotype and by characters of the fur 8 Ecology and behavior editThe species is known from two localities in Minas Gerais southeastern Brazil near the border of the Atlantic Forest and Cerrado biomes 9 Both specimens from Capitao Andrade were caught in grass near a stream The species is infected by species of Taenia and Hepsilon and unidentified nematodes 10 References edit Bonvicino et al 2010 pp 19 28 Bonvicino et al 2010 pp 27 28 Bonvicino et al 2010 fig 3 p 32 Bonvicino et al 2010 p 28 Bonvicino et al 2010 table 3 Bonvicino et al 2010 p 29 Bonvicino et al 2010 p 30 Bonvicino et al 2010 pp 31 32 Bonvicino et al 2010 p 20 Bonvicino et al 2010 p 21Literature cited edit nbsp Wikispecies has information related to Calomys cerqueirai Bonvicino C R de Oliveira J A and Gentile R 2010 A new species of Calomys Rodentia Sigmodontinae from southeastern Brazil Zootaxa 2336 19 35 Retrieved from https en wikipedia org w index php title Calomys cerqueirai amp oldid 1221798252, wikipedia, wiki, book, books, library,
