Taxonomic status of large- and middle-sized<i>Calomys</i>(Cricetidae: Sigmodontinae) from the southern central Andes inferred through geometric morphometrics of the skull

Martínez, Juan José; Sandoval, María Leonor; Carrizo, Luz Valeria

doi:10.1093/jmammal/gyw123

Cited by 9 publications

(4 citation statements)

References 42 publications

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“…Regarding the distribution of large‐bodied Calomys in the Tucumane–Bolivian Yungas ecoregion of southern Bolivia and north‐western Argentina, Pinotti et al (2020) genetically analysed 97 specimens from 24 localities and all corresponded to C. fecundus . This evidence contrast with data reported by Martínez et al (2016) who highlight the occurrence of C. venustus and C. callosus s.s. for this forested region, probably a misidentification due to the strong morphological resemblance among these species. Also, the potential distribution of C. fecundus , C. venustus , C. callidus and C. callosus s.s. hardly overlap (Pinotti, 2021).…”

Section: Discussioncontrasting

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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Section: Discussioncontrasting

confidence: 99%

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

et al. 2022

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“…1). A total of 129 adult mice (i.e., with the molars fully erupted and variable tooth wear [32]), were analyzed in this study: A. olivacea N = 80 and O. longicaudatus N = 49 ( Table 1). A total of 111 crania were evaluated by linear and three-dimensional geometric morphometric methods simultaneously.…”

Section: Study Area and Samplesmentioning

confidence: 99%

“…Each 3D model was digitized two times and an average landmark's configuration was obtained for a single cranium in MorphoJ v.1.06d [35]. The landmarks used in this study corresponded to a subset of the landmarks studied by Martínez et al [32] for other sigmodontine rodents. See details of landmark's anatomical location and description in Fig.…”

Section: Three-dimensional Geometric Morphometric Analysesmentioning

confidence: 99%

“…Centroid Table 2 Anatomical description of the landmarks used for three-dimensional geometric morphometric analyses. Anatomical description followed to Martínez et al [32] Landmark size is calculated as the square root of the sum of squared distances of each landmark to the center of the configuration [43]. Later, a Procrustes ANOVA was performed to test the differences in the centroid size between insular and mainland individuals of each species in MorphoJ v.1.06d [35].…”

Section: Three-dimensional Geometric Morphometric Analysesmentioning

confidence: 99%

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Morphological variation in two sigmodontine rodents along the mainland and the Fuegian archipelago in Chilean southern Patagonia

Valladares-Gómez

Huenumilla-Linares

Rodríguez‐Serrano

et al. 2020

Rev. Chil. de Hist. Nat.

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Background: Analysis of morphological variation in archipelagos has been essential to understand the evolution of terrestrial vertebrates. In particular, these natural scenarios allow to assess morphological changes experienced by insular fauna compared to their mainland counterparts. In mammals, morphological changes of insular forms have been observed in size and shape of body and cranial traits. The southern Patagonia of Chile represents a unique scenario to analyze morphological variation in two of the most widely distributed small rodents along western southern South America: Abrothrix olivacea and Oligoryzomys longicaudatus. Methods: We applied linear and three-dimensional geometric morphometric tools to analyze the variation in cranial morphology of A. olivacea (N = 80) and O. longicaudatus (N = 49). Sampled localities were distributed in the mainland and islands of the Fuegian archipelago in Chilean Patagonia. Standard multivariate methods, as Principal Components Analysis, and Logistic Regression models were carried out to evaluate differences in size and shape of crania. Results: We detected higher levels of morphological variation in the crania of A. olivacea if compared to O. longicaudatus. The variation was associated to cranial size instead of shape. We observed significant differences between insular and mainland individuals in A. olivacea, being the cranium size of this species significantly bigger on islands. Indeed, specimens of A. olivacea from "Isla Wellington", exhibited the higher increment in cranium size compared to any other mainland and insular site sampled for this species. In contrast, insular and mainland forms of O. longicaudatus did not show significant differences in cranial morphology. Conclusions: We suggest that the patterns of morphological variation observed in these two small rodents along Patagonia, could be explained in terms of the historical biogeography of the region, and the different ecological features of the studied species.

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Cranial geometric morphometrics of jumping mice (Genera: Eozapus, Napaeozapus, and Zapus; Zapodinae, Rodentia): Implications for subspecies conservation

Alhajeri

2023

J Mammal Evol

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Taxonomic status of large- and middle-sizedCalomys(Cricetidae: Sigmodontinae) from the southern central Andes inferred through geometric morphometrics of the skull

Cited by 9 publications

References 42 publications

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

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

Morphological variation in two sigmodontine rodents along the mainland and the Fuegian archipelago in Chilean southern Patagonia

Cranial geometric morphometrics of jumping mice (Genera: Eozapus, Napaeozapus, and Zapus; Zapodinae, Rodentia): Implications for subspecies conservation

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