XLV.—<i>The Spedan Lewis South American Exploration</i>.—II. <i>On mammals collected in the Tarija Department, Southern Bolivia</i>

F.R.S., Oldfield Thomas

doi:10.1080/00222932608633418

Cited by 9 publications

(8 citation statements)

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“…It was described by Thomas (1916) on specimens from Villa Nougu6s, San Pablo, 1200m, Tucumfin Province, Argentina. Later, Thomas (1926) renamed this form as A. varius simulator. Recently, Myers (1989) assembled several species of the genus Akodon in what he called the varius group, which includes: A.…”

Section: Previous Taxonomic and Karyosystematic Workmentioning

confidence: 99%

Multiple autosomal polymorphism in populations of Akodon simulator simulator Thomas, 1916 from Tucum�n, Argentina (Rodentia, Cricetidae)

1990

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Cytogenetic analysis was performed on twenty seven specimens of Akodon simulator simulator collected in three different localities of Tucumfin Province, Argentina. Diploid number, chromosomal morphology and C and G banding patterns were studied. Eight different karyomorphs were found, with diploid numbers of 2n = 38, 39, 40, 41, and 42. All individuals showed the same number of chromosomal arms (FN = 42). G-bands enable to identify chromosomal pairs (1, 10, 11, 12, 13, and 14) involved in three centric fusions. C-bands revealed that the heterochromatin is located in centromeric regions of the telocentric and biarmed chromosomes. The present study allowed us to document a new example of a floating multiple Robertsonian fusion polymorphism. The data are discussed in relation to the occurrence of Robertsonian polymorphism in natural populations. ResumenPolimorfismo autos6mico mtiltiple en poblaciones de Akodon simulator simulator Thomas, 1916 de Tucum~in, Argentina (Rodentia, Cricetidae). Se realiz6 un andlisis citogen6tico de 27 especimenes de Akodon simulator simulator colectados en tres localidades diferentes de la provincia de Tucumfin, Argentina. Se determin6 el nfimero diploide, la morfologia cromos6mica y los patrones de bandeo C y G. Se encotraron 8 cariomorfos diferentes, con nfimeros diploides de 2n ---38, 39, 40, 41, y 42. Todos los individuos presentaron el mismo ntimero de brazos cromos6micos (FN = 42). Las bandas G permitieron identificar los pares cromos6micos (1, 10, I 1, 12, 13, y 14) involucrados en tres fusiones c6ntricas y las bandas C revelaron que la heterocromatina estfi localizada en las regiones centrom6ricas de los cromosomas teloc6ntricos y de los cromosomas bibraquiados. E1 presente estudio nos permite analizar un nuevo ejemplo de un polimorfismo robertsoniano. Los datos son discutidos en relaci6n con la presencia de los polimorfismos robertsonianos en la naturaleza.

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Section: Previous Taxonomic and Karyosystematic Workmentioning

confidence: 99%

Multiple autosomal polymorphism in populations of Akodon simulator simulator Thomas, 1916 from Tucum�n, Argentina (Rodentia, Cricetidae)

1990

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“…Given the results obtained in the present study, in addition to the published chromosomal data and biogeographical distributions (see Table 3), in the following paragraphs, we will summarise the relevant information for each species and discuss any unresolved taxonomic issues. Thomas (1901) described two species now belonging (or associated) to the C. callosus complex: Calomys boliviae (Thomas, 1901) and Calomys fecundus (Thomas, 1926). In his original descriptions, reported larger morphological measurements for C. fecundus than for C. boliviae, although he did not explicitly compare them.…”

Section: Integration Of Molecular Data With Geographic Distributions ...mentioning

confidence: 99%

Molecular systematics and biogeographic insights of the Calomys callosus complex (Rodentia, Cricetidae)

et al. 2022

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The genus Calomys includes several species that have very similar external morphologies, which often leads to confusing field identification and has resulted in conflictive taxonomic histories. One of its clades involves large‐sized body forms, known as the Calomys callosus complex. In a previous study, a biogeographic hypothesis was proposed to explain a south‐to‐north colonisation of South America by species of this complex. However, other studies which not included all members of the complex' members and that used different molecular markers, did not support that biogeographic hypothesis. Here we explore the relationships among C. callosus sensu stricto (s.s.), C. fecundus, C. callidus, C. venustus, C. tocantinsi and Calomys sp. using two mitochondrial genes (Cyt‐b and Control Region) and two nuclear genes (Rhp3 and i7FGB) data. We also applied several gene trees and species delimitation methods to elucidate the taxonomy, distribution and evolutionary relationships among the analysed species. By including sequences of individuals from Argentina, Brazil, Bolivia and Paraguay, we reconstructed the possible ancestral biogeographic origin of the complex. Two main clades were recovered: the western showed the relationships (C. venustus [C. fecundus–Calomys sp.]), while the eastern (C. callidus [C. callosus s.s.–C. tocantinsi]). These results support the original biogeographic hypothesis and suggest the following scenario: in the west, from the Espinal ecoregion, first the Tucumane–Bolivian Yungas and later, the Beni savanna would have been colonised. In the east, from the Espinal, first the Chaco and later the Cerrado ecoregions may have been occupied.

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“…Thomas, 1926 (Figure 6 A, B, C, D, E; Map, Figure 10) Common Name: Lewis's tuco-tuco, tuco-tuco de Lewis. Morphology: (n = 15) Body length 268; tail 76; hindfoot 39; ear 8; weight 291 g. Thomas (1926) characterized C. lewisi as a large reddish-brown species with unusually proodont incisors. He stated: "Ctenomys leucodon has similarly proodont incisors, but these (C. leucodon) are comparatively slender, are not so strongly flattened in front, and are almost unpigmented. "…”

Section: Ctenomys Leucodon Waterhouse 1848mentioning

confidence: 99%

“…He stated: "Ctenomys leucodon has similarly proodont incisors, but these (C. leucodon) are comparatively slender, are not so strongly flattened in front, and are almost unpigmented. " Because Thomas (1926) compared C. leucodon with C. lewisi, we will make some similar comparisons here. Individuals of C. lewisi that we trapped at the Iscayachi locality were of a rich dark black/brown color dorsally and lighter with grey ventrally.…”

Section: Ctenomys Leucodon Waterhouse 1848mentioning

confidence: 99%

“…Natural history: This species was first collected from burrows in wet stream banks, which led Thomas (1926) to suggest C. lewisi had semi-aquatic habits. No such habit has been suggested for any other species of tuco-tuco and some, but not all, of the specimens captured by members of our expedition in 1986 near Iscayachi were trapped from burrows in damp soil near the Rio Tomayapo.…”

Section: Ctenomys Lewisimentioning

confidence: 99%

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Conservation status and natural history of Ctenomys, tuco-tucos in Bolivia

Gardner

Botero-Cañola

Rossel

et al. 2021

Therya

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The genus Ctenomys consists of about 70 species and in addition to the Geomyidae of the Nearctic, Neotropical tuco-tucos represent a well-documented case of diversification in the subterranean biotype. Here we will: i) Provide an updated summary of the natural history of the 12 species of extant tuco-tucos from Bolivia; ii) Update information on distributions of each species; and iii) Using ecological niche modeling, evaluate recent and projected habitat transformation or habitat degradation within the known range of each species to provide a preliminary assessment of the preservation or conservation status of ctenomyids within Bolivia. We follow Gardner et al. (2014) and combine species summaries with both updated published and new data to compile a complete list of known extant species of tuco-tucos from Bolivia. Occurrence data for Ctenomys in Bolivia and surrounding areas were extracted from the database Arctos and GBIF. All individual specimen-based locality records were checked and georeferenced by referring to original museum collection records. We created species distribution models for the species with enough locality records using climate and soil data, while for the rest of the species we estimated the ranges based on the known occurrence localities. Finally, we quantified the amount of large-scale habitat conversion occurring within each species range, as well as the potential effect of climatic change on species distribution. Here we present information regarding the biology of tuco-tuco (Ctenomys) species known to occur in Bolivia, including unpublished natural history data such as habitat association, interactions and activity patterns gathered by the authors through extensive field work. Besides this, we estimated the current distribution of Ctenomys species, quantified large-scale habitat transformation within each species range and assessed the potential effect of climatic change on five tuco-tuco species. We found that the habitats within the ranges of C. boliviensis and C. steinbachi have experienced significant land-cover conversions in recent years. We also show that C. opimus, as well as the above mentioned species are expected to undergo range contractions resulting from climatic change by 2070. Our review shows that there is a dearth of information regarding natural history, taxonomy and distribution for many Bolivian tuco-tuco species. Nonetheless, the information presented here can be a tool for directing and focusing field studies of these species. This is of great importance if we take into account that most of the Bolivian tuco-tucos are subject to one or several conservation/preservation threats. These include: Habitat destruction via land use or climatic changes in conjunction with geographic ranges of Ctenomys that are small in areal extent and which in many cases are not adequately covered by protected areas.

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XLV.—The Spedan Lewis South American Exploration.—II. On mammals collected in the Tarija Department, Southern Bolivia

Cited by 9 publications

References 0 publications

Multiple autosomal polymorphism in populations of Akodon simulator simulator Thomas, 1916 from Tucum�n, Argentina (Rodentia, Cricetidae)

Multiple autosomal polymorphism in populations of Akodon simulator simulator Thomas, 1916 from Tucum�n, Argentina (Rodentia, Cricetidae)

Molecular systematics and biogeographic insights of the Calomys callosus complex (Rodentia, Cricetidae)

Conservation status and natural history of Ctenomys, tuco-tucos in Bolivia

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