A Short Overview of the Systematics of Ctenomys: Species Limits and Phylogenetic Relationships

D’Elı́a, Guillermo; Teta, Pablo; Lessa, Enrique P.

doi:10.1007/978-3-030-61679-3_2

Cited by 24 publications

(20 citation statements)

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“…Sampling locations of Reserva Provincial Parque Luro, Anguil, Macachín, and Villa Maza grouped within the mendocinus clade in the phylogeny carried out with the cyt-b locus (these were sequenced only for this molecular marker: see Table 1 ) with a maximum posterior probability and greater affinity with C. azarae and C. porteousi . These results are partially in disagreement with those reported by D’Elía et al (2021) , who proposed that C. azarae and C. porteousi should be considered as subjective junior synonyms of C. mendocinus .…”

Section: Discussioncontrasting

confidence: 99%

“…Beyond this, these authors recognize the need for more in-depth comprehensive studies regarding aspects of morphological and molecular taxonomy. On the other hand, D’Elía et al (2021) did not mention some attributes of the natural phenotypic variation (e.g., body sizes; pelage colors) and the conformation of major phylogeographic groups highlighted in Mapelli et al (2017) .…”

Section: Discussionmentioning

confidence: 99%

“…Subterranean rodents of the genus Ctenomys (Ctenomyidae: Caviomorpha; Blainville, 1826) are the most diverse in number of species of all native South American rodents, with about 68 recognized species ( Bidau, 2015 ; Freitas, 2016 ; Teta and D’Elía, 2020 ; D’Elía et al, 2021 ). However, about 85 names have been assigned to biological entities of this genus and many taxa need to be properly delimited both geographically and systematically ( Woods and Kilpatrick, 2005 ; Parada et al, 2011 ; Mapelli et al, 2017 ; Caraballo et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

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Redefining the Distributional Boundaries and Phylogenetic Relationships for Ctenomids From Central Argentina

et al. 2021

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With about 68 recognized living species, subterranean rodents of the genus Ctenomys are found in a multiplicity of habitats, from the dunes of the Atlantic coast to the Andes Mountains, including environments ranging from humid steppes of Pampas to the dry deserts of Chaco region. However, this genus needs an exhaustive reevaluation of its systematic and phylogenetic relationships regarding the different groups that compose it. This knowledge is essential to propose biodiversity conservation strategies both at species level and at higher hierarchical levels. In order to clarify the taxonomy and the recent evolutionary history from populations of Ctenomys in the Pampas region, Argentina, phylogenetic relationships among them were evaluated using mitochondrial DNA sequences: gene encoding cytochrome b protein (1,140 bp) and the non-coding D-loop region (434 bp). To infer the divergence times inside the Ctenomys clade, a Bayesian calibrate tree using fossil remains data from different families within Caviomorpha was performed at first. Secondly, that calibration data was used as priors in a new Bayesian phylogenetic inference within the genus Ctenomys. This phylogenetic tree emphasized on species currently distributed on the Pampas region, more precisely considering both the talarum and mendocinus groups. Bayesian inferences (BI) were integrated with the results of a Maximum Likelihood approach (ML). Based on these results, the distributional limits of the mendocinus and talarum groups appear to be related to the physiognomy of the Pampas region soils. On the other hand, the validity of C. pundti complex as a differentiated species of C. talarum is debated. According to previous evidence from morphological and chromosomal studies, these results show a very low divergence between those species that originally were classified within the talarum group. Mitochondrial DNA sequences from populations associated with these putative species have not recovered as reciprocal monophyletic groups in the phylogenetic analyses. In conclusion, C. talarum and C. pundti complex might be considered as the same biological species, or lineages going through a recent or incipient differentiation process. The results obtained in this study have important implications for conservation policies and practices, since both species are currently categorized as Vulnerable and Endangered, respectively.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

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Redefining the Distributional Boundaries and Phylogenetic Relationships for Ctenomids From Central Argentina

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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%

“…Thus, species boundaries may often be difficult to define. In addition, remarkable morphological homogeneity is frequent even among long-standing differentiated species (D'Elía et al 2021). In such a still largely inconclusive scenario, however, major systematic and phylogenetic knowledge has been generated in just over two decades (e.g., Lessa and Cook 1998;D'Elía et al 1999;Mascheretti et al 2000;Slamovits et al 2001;Castillo et al 2005;Parada et al 2011;Gardner et al 2014;Bidau 2015;Freitas 2016Freitas , 2021Caraballo and Rossi 2018;Fornel et al 2018;Leipnitz et al 2020;Teta and D'Elía 2020;D'Elía et al 2021;De Santi 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 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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Speciation Within the Genus Ctenomys: An Attempt to Find Models

Freitas

2021

Tuco-Tucos

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A Short Overview of the Systematics of Ctenomys: Species Limits and Phylogenetic Relationships

Cited by 24 publications

References 63 publications

Redefining the Distributional Boundaries and Phylogenetic Relationships for Ctenomids From Central Argentina

Redefining the Distributional Boundaries and Phylogenetic Relationships for Ctenomids From Central Argentina

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

Speciation Within the Genus Ctenomys: An Attempt to Find Models

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