Looking under stones: A new Ctenomys species from the rocky foothills of the Sierras Grandes of central Argentina

Mapelli, Fernando J.; Teta, Pablo; Contreras, Facundo; Pereyra, Daniela; Priotto, José; Coda, José

doi:10.1007/s10914-022-09634-4

Cited by 14 publications

(2 citation statements)

References 77 publications

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“…in the Andean range (Bidau 2015;Freitas 2016). Currently, 66 species are recognized as formally described independent units (Bidau 2015;Freitas 2016;D'Elía et al 2021;Brook et al 2022;Mapelli et al 2022), and several other populations have been or are being recognized as separately evolving lineages, although they have not yet been formally nominated. As pointed out by D' Elía et al (2021), the systematics of Ctenomys remains in a state of flux due to both intrinsic aspects of its evolutionary process and the patchy history of its study.…”

Section: Introductionmentioning

confidence: 99%

A new species of the highly polytypic South American rodent Ctenomys increases the diversity of the magellanicus clade

Verzi

Santi

Olivares

et al. 2023

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The subterranean rodent Ctenomys is the most polytypic South American mammal genus and one of the most speciose and rapidly diversifying mammal genera in the world. Its systematics is unstable due to the underlying accelerated diversification processes that give rise to evolutionary lineages at different stages of differentiation and to remarkable morphological homogeneity even among long-differentiated species. As a result, species boundaries are often difficult to define. Diversity of this genus in the coastal area of central Argentina has been extensively studied, with two independent lineages currently recognized while a distinct third population had not been previously detected. Through a phylogenetic analysis based on combined morphological and molecular evidence, Bayesian estimates of divergence times, and morphometric and morphological assessments, we recognize this third population as an independently evolving lineage. The new species, Ctenomys pulcersp. nov., is here described for both the living fauna and the fossil record of the Pampean region of central Argentina. According to phylogenetic results, Ctenomys pulcersp. nov. belongs to the essentially Patagonian magellanicus clade, and would have diverged from its sister species, Ctenomys bidaui, during the middle Pleistocene (ca. 0.4 Ma). Its current distribution in the fixed and semifixed dunes of the coastal Pampean region is assumed to represent a relict of a wider and continuous distribution of potentially suitable environments during the late Pleistocene. Ctenomys pulcersp. nov. occurs in a particularly fragile natural system subjected to profound disturbances caused by diverse anthropic actions and therefore measures for the conservation of its habitat will be indispensable.

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Section: Introductionmentioning

confidence: 99%

A new species of the highly polytypic South American rodent Ctenomys increases the diversity of the magellanicus clade

Verzi

Santi

Olivares

et al. 2023

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“…The genus Ctenomys, a highly diverse genus of subterranean rodents popularly known as tuco-tucos (Freitas et al, 2021). Their about 70 species (Bidau, 2015;Teta and D'Elía, 2020;D'Elía et al, 2021;De Santi et al, 2021;Mapelli et al, 2022;Verzi et al, 2023) have a Pliocene origin, and virtually all diversification events took place during Quaternary (Verzi et al, 2021;De Santi et al, 2021), making tucotucos one of the most explosive mammalian radiations. This rapid diversification within different South American biomes has been inputted to the chromosomal mode of speciation (Freitas et al, 2021) because of their considerable karyotypic diversity, both inter and intraspecifically with diploid numbers ranging from 2n = 10 to 2n = 70 (Reig and Kiblisky, 1969;Kiblisky et al, 1977;Freitas and Lessa, 1984;Reig et al, 1990;Massarini et al, 1991;Freitas, 1997Freitas, , 2001Freitas, , 2021Slamovits et al, 2001;Freitas et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Cranial morphological variation of Ctenomys lami (Rodentia: Ctenomyidae) in a restricted geographical distribution

Fornel,

Maestri,

Cordeiro-Estrela

et al. 2023

Genet. Mol. Biol.

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The relationship between chromosomal and morphological variation in mammals is poorly understood. We analyzed the cranial size and shape variation in Ctenomys lami concerning to the geographic variation in their chromosome numbers. This subterranean rodent occurs in a narrow range of sand-dunes in the Coastal Plain of southern Brazil. This species presents a high karyotypic variation with diploid numbers varying from 2n = 54 to 2n = 58, involving the fission and fusion of chromosome pairs 1 and 2. Due to different chromosome rearrangement frequencies along their geographic distribution, four karyotypic blocks were proposed. This study, explored cranium shape and size variation in geographical, chromosomal polymorphism, and chromosome rearrangements contexts to test whether the four karyotypic blocks reflect morphologically distinct units. For this, we measured 89 craniums using geometric morphometrics and used uni and multivariate statistics to discriminate the predicted groups and test for an association among chromosomal and morphological variation. Our results show the size and shape of sexual dimorphism, with males larger than females, and support the existence of four karyotypic blocks for Ctenomys lami based on morphological variation. However, our results do not support a direct relationship between chromosomal and cranial morphological variation in C. lami.

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An exceptionally well-preserved fossil rodent of the South American subterranean clade Ctenomys (Rodentia, Ctenomyidae). Phylogeny and adaptive profile

De Santi,

Olivares,

Piñero

et al. 2024

J Mammal Evol

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Looking under stones: A new Ctenomys species from the rocky foothills of the Sierras Grandes of central Argentina

Cited by 14 publications

References 77 publications

A new species of the highly polytypic South American rodent Ctenomys increases the diversity of the magellanicus clade

A new species of the highly polytypic South American rodent Ctenomys increases the diversity of the magellanicus clade

Cranial morphological variation of Ctenomys lami (Rodentia: Ctenomyidae) in a restricted geographical distribution

An exceptionally well-preserved fossil rodent of the South American subterranean clade Ctenomys (Rodentia, Ctenomyidae). Phylogeny and adaptive profile

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