The History of Ctenomys in the Fossil Record: A Young Radiation of an Ancient Family

Verzi, Diego H.; Santi, Nahuel A. De; Olivares, A. Itatí; Morgan, Cecilia C.; Álvarez, Alicia

doi:10.1007/978-3-030-61679-3_1

Cited by 9 publications

(5 citation statements)

References 42 publications

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“…talarum by Pardiñas (2001). They were interpreted as an independent lineage belonging to the mendocinus species group by De Santi et al (2018, 2021, Verzi et al (2021), andDe Santi (2022).…”

Section: Description and Comparisonmentioning

confidence: 99%

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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: Description and Comparisonmentioning

confidence: 99%

“…Moreover, when preliminarily recognized as a morphologically distinct entity (informally as Ctenomys "monte", Morgan 2009;Morgan andVerzi 2006, 2011;Morgan et al 2017 or Ctenomys sp. C, Verzi et al 2021;De Santi 2022), it was incorrectly assigned to the mendocinus species group (De Santi et al 2021;Verzi et al 2021).…”

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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“…Así, añadimos nuevas áreas para la distribución de estas especies y presentamos sus relaciones filogenéticas. (Verzi et al 2021). The systematics of the genus has been very difficult to understand, perhaps because of the great number of species, or for the lack of differentiation, a consequence of rapid episodes of cladogenesis, or both (Verzi et al 2010;Parada et al 2011;Gardner et al 2014;.…”

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confidence: 99%

“…Ctenomys –a genus of subterranean caviomorph rodents commonly known as tuco-tucos, tunduques, or ocultos–is endemic to the southern portion of South America, where it inhabits a range of environments, from sea level up to 5,000 m elevation, between 10° and 55° South latitude in Argentina, Bolivia, Brazil, Paraguay, Peru, and Uruguay (Bidau 2015). The current diversity includes 65 nominal species (Brook et al 2021; D'Elía et al 2021) that evolved over up to 3.5 million years (Verzi et al 2021). The systematics of the genus has been very difficult to understand, perhaps because of the great number of species, or for the lack of differentiation, a consequence of rapid episodes of cladogenesis, or both (Verzi et al 2010; Parada et al 2011; Gardner et al 2014; Teta and D'Elía 2020).…”

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confidence: 99%

Review of three neglected species of Ctenomys (Rodentia: Ctenomyidae) from Argentina

Tomasco

Díaz

Bárquez

2023

Journal of Mammalogy

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Ctenomys is one of the most speciose genera among South American rodents, whose systematics have not yet been fully elucidated. One of the difficulties for clarifying the identity of its species is the limited information available on some of them, erected more than a century ago and of which only the original descriptions are known, generally very poorly detailed. Our study provides new information about Ctenomys coludo Thomas 1920, based on the collection of topotype specimens that allowed us to perform more detailed morphological and molecular analyses, and to compare them with the available information referred to the holotype, with specimens deposited in museum collections, and other species of the genus that have been proposed as related to C. coludo. Our results allow us to place C. coludo as a member of the mendocinus group, proposing C. famosus Thomas, 1920 as a junior synonym for C. coludo. We also recognize Ctenomys johannis as a valid and full species, and provide unpublished information on it from the collection of specimens at the type locality. Thus, we add new areas for the distribution of these species and present their phylogenetic relationships.

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The History of Ctenomys in the Fossil Record: A Young Radiation of an Ancient Family

Cited by 9 publications

References 42 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

Review of three neglected species of Ctenomys (Rodentia: Ctenomyidae) from Argentina

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