Diego H. Verzi

Universidad Nacional de La Plata | UNLP · Sección Mastozoología

Full text available at http://rdcu.be/mE6K.___________________________________ Octodontoidea is the most species-rich clade among hystricomorph rodents. Based on a combined parsimony analysis of morphological and molecular data of extinct and extant species, we analyze the history of South American octodontoids and propose ages of divergence older...

South American Octodontoidea is the most species-rich clade among both extinct and extant hystricomorph rodents. The evolutionary histories of its two major groups, Octodontidae and Echimyidae, are differentially linked to the main Cenozoic palaeoenviromental changes. According to a combined parsimony analysis of morphological and molecular data, t...

A quali-quantitative morphofunctional analysis of the craniomandibular joint in subterranean rodents of the family Ctenomyidae showed that specializations of this joint are coupled with adaptations to digging. The presence of a postglenoid articular region in the skull of Eucelophorus and Ctenomys implies a new position of the mandible in digging,...

Differentiation of genera of the modern (Late Miocene to Recent) South American rodent family Ctenomyidae would have been linked to the acquisition of disparate adaptations to digging and life underground. In accordance with this hypothesis, the delimitation of lineages and genera in the ctenomyid fossil record is evaluated here following an adapta...

Biostratigraphy and biochronology of the Late Miocene of central Argentina is analyzed through evolutionary patterns of octodontoid rodents. The studied faunas were found in continental sediments assigned to the Cerro Azul and Saldungaray formations (La Pampa and Buenos Aires provinces, respectively). Taphonomic attributes of recovered mammals, lin...

Brain morphological variation is analysed through virtual endocasts in a highly diversified clade of caviomorph rodents belonging to the family Echimyidae. Diversification in brain size and shape is explored through geometric morphometrics and comparative phylogenetic analyses. The results indicate that brain shape is largely independent of general...

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...

Cerro Patagua is a locality with fossiliferous outcrops of the Cerro Azul Formation in La Pampa Province (central Argentina). First fossil remains were known in 1999 and assigned to the Chasicoan Stage/Age (Late Miocene, Tortonian) after the presence of the Octodontoidea rodent Chasichimys bonaerense. Later references to vertebrate remains were sca...

Occurrence charts of Pleistocene mammals in the Pampean area, eastern Argentina

Echimyidae is the most widely diversified family among hystricognath rodents, both in the number of species and variety of lifestyles. In the Patagonian Subregion of southern South America, extinct echimyids related to living arboreal species (Echimyini) are recorded up to the middle Miocene, whereas all the known southern fossils since the late Mi...

Read-only version: https://onlinelibrary.wiley.com/share/author/J39BSPUMDFDQAGW3XQPP?target=10.1002/spp2.1368 ------------ Abstract. We analyse the taxonomic status and diversity of the late Miocene Octodontoidea (Hystricognathi) Cercomys primitiva and related samples, a taxon previously known only from the holotype specimen. New findings associate...

Available at https://www.tandfonline.com/eprint/NHMCHA46SJECQUCPMWJF/full?target=10.1080/14772019.2021.1910583___Abstract: The South American Ctenomys is the most speciose genus among both hystricomorphs and subterranean rodents of the world. Here, we present the most exhaustive phylogenies and timetree of living and extinct Ctenomys attempted thus...

The Guanaco Formation (Orán Group) is one of the Neogene units outcropping in the Subandean region of northwestern Argentina. The fossil assemblage from the middle section was studied in a few contributions. Here we present new remains for the middle section (~6.3 Ma) and the first records for the upper section (<5.7 Ma) of this unit, collected in...

Caviomorphs are a mainly South American rodent clade with high taxonomic and ecomorphological diversity. In this study, we combine geometric morphometric, functional, ancestral reconstruction, and macroevolutionary analyses to quantify the magnitude, direction, and rates of shape diversification of the caviomorph mandible, and to explore the morpho...

We review the history of the South American hystricomorph rodent family Ctenomyidae as told by its fossil record and phylogenetic hypotheses. Differing interpretations of the evolutionary significance of extinct taxa have led to disparate accounts of the history of the family. Thus, assessing hypotheses that assign fossils to the different evolutio...

This paper presents the zooarchaeological research carried out on Ctenomys (Rodentia: Ctenomyidae) bone remains recovered at Quebrada del Real 1 (ca. 7400–360 years BP), an archaeological site located in the Sierras of Córdoba upper mountain grassland range of Argentina. Here, we focus on the importance of Ctenomys implications to wild‐life managem...

In the last years, a murine identified as Paraethomys aff. abaigari has been repeatedly recognized in several early Pliocene localities of the Iberian Peninsula. We have revised these occurrences, as well as other samples of similar morphology, and propose that all these records correspond to a new species. We diagnose Paraethomys baeticus sp. nov....

We combine morphological (qualitative and quantitative data) and genetic (one mitochondrial and one nuclear gene) data from a large set of specimens of Octodon from the four currently recognized living species of the genus. The integration of the results (qualitative assessment, multivariate analysis of cranial measurements, and gene trees) allows...

Echimyidae is a species‐rich clade of Neotropical rodents, which diversified in association with forested biomes. Since the late Miocene, a few lineages from southern South America have been adapted to open environments. Eumysops is one of these southern echimyids, and its peculiar craniomandibular morphology has been assumed to be a result of adap...

Caviomorph rodents constitute a highly diverse clade of Neotropical mammals. They are recorded since at least the late Middle Eocene and have a long and complex evolutionary history. Using geometric morphometric data, we analysed the variation in mandibular shape of this clade through integration analyses, allometry and shape optimizations onto a p...

Caviomorph rodents constitute a highly diverse clade of Neotropical mammals. They are recorded since at least the late Middle Eocene and have a long and complex evolutionary history. Using geometric morphometric data, we analysed the variation in mandibular shape of this clade through integration analyses, allometry and shape optimizations onto a p...

El roedor subterráneo Ctenomys Blainville es el único representante viviente de la familia Ctenomyidae, y es el género de Hystricomorpha más rico en especies. Su registro fósil se inicia en el Plioceno tardío y muestra incremento en diversidad desde el Pleistoceno. La mayoría de los fósiles descriptos pertenecen a especies extintas, y unas pocas es...

Available in this link: https://www.tandfonline.com/eprint/ZJwadBvi8jB857Nk4k3m/full ------ Abstract: We offer brief commentaries on Boivin and Marivaux's account of caviomorph molar morphology and evolution. In accordance with Van Valen’s statement ‘Homology is resemblance caused by a continuity of information’, we reaffirm that understanding the...

Se estudió la morfología del laberinto del oído interno en siete representantes vivientes y extintos de las cuatro familias de roedores Octodontoidea. Las reconstrucciones 3D se obtuvieron mediante MIMICS 10.01 a partir de microtomografías computadas de alta resolución, con un tamaño de píxel de entre 40 y 52 um. En las especies analizadas, las cóc...

Echimyidae is an ancient, widely diversified hystricomorph clade whose evolutionary history is linked to the Neotropical forested areas. Its fossil record, mostly from southern South America, shows temporal stages concurrent with Cenozoic climatic trends. Fossils from the late Oligocene to middle Miocene are related to living arboreal species, wher...

Full text available at http://www.tandfonline.com/eprint/rM39dqrI8CkgnUFCRzh6/full We analyse the crest homologies of lower deciduous premolars (Dp4) of South American caviomorphs in a comparative context including other hystricomorphs and under a dynamic topological criterion. An hexalophodont pattern in which the three anteriormost crests are a...

We explored the distribution of tooth- and scratch-digging specializations in species of the subterranean rodent Ctenomys (tuco-tucos) from diverse environments and representing different clades. Principal component analysis of craniodental and postcranial indexes with functional relevance showed that specializations for tooth-digging on one hand,...

El género sudamericano Ctenomys (único representante viviente de la familia Ctenomyidae) es el género de roedores histricomorfos más rico en especies, y el más rico entre los roedores subterráneos del mundo. Su registro fósil está pendiente de revisión; comienza en el Plioceno tardío y es abundante a partir del Pleistoceno. Aquí se brindan resultad...

Online access available at http://www.tandfonline.com/eprint/WwqYDYYiXszZmBDVv7V2/full ABSTRACT—A new genus of echimyid rodent, Ullumys, from the uppermost Miocene of northwestern Argentina is described. It includes two species, U. pattoni sp. nov. and Ullumys intermedius nov. comb. Ullumys pattoni is known from a skull fragment and the correspondi...

Caviomorph rodents are one of the most diverse mammalian groups in the Neotropics; they display astonishing eco-morphological variation, including unparalleled size range. Here we analyze evolutionary patterns among extant caviomorphs, particularly their rates of diversification and size evolution. The results show large heterogeneity in the evolut...

Available at: http://www.tandfonline.com/eprint/sQite5kmMD8JTbfAnHQ5/full ABSTRACT.--Octodontoidea is the most species-rich clade among hystricomorph rodents, and has a fossil record going back to at least the late Oligocene. Affinities of fossils previous to the late Miocene differentiation of the extant families Abrocomidae, Echimyidae and Octo...

†Eumysops is a peculiar representative of the currently tropical family Echimyidae, which evolved in increasingly dry and cold Plio–Pleistocene environments of southern South America. The results of a systematic and stratigraphic review of the genus, and of phylogenetic analyses based on both morphology and a combined morphological–molecular datase...

Full text available at http://rdcu.be/mHTO The mammalian cranium is a complex structure composed by three partially independent modules: face, cranial base and cranial vault. At the same time, it interacts with the mandible by sharing the masticatory function. Since these units develop and work together, their function and evolution may occur thro...

Phylogeny and evolutionary patterns of South American octodontoid rodents. Acta Palaeontologica Polonica 59 (4): 757–769. Octodontoidea is the most diverse clade of hystricognath rodents, and is richly recorded in South America since at least the Oligocene. A parsimony-based morphological phylogenetic analysis of a wide range of extant and extinct...

The genus Reigechimys (Rodentia, Echimyidae) was originally described on the basis of two mandibular fragments recovered from Huayquerian (late Miocene) outcrops of the Cerro Azul Formation in La Pampa Province (Argentina). The included species (R. plesiodon Verzi et al. and R. octodontiformis Verzi et al.) represent a peculiar lineage characterize...

Caviomorph rodents represent an excellent model to explore morphological diversification on a macroevolutionary scale, as they are ecologically and morphologically diverse. We analysed cranial shape variation using geometric morphometrics and phylogenetic comparative methods. Most variation involved the shape of the rostrum, basicranium, and crania...

Octodontoidea is the most diverse clade of hystricognath rodents, and is richly recorded in South America since at least the Oligocene. A parsimony-based morphological phylogenetic analysis of a wide range of extant and extinct octodontoids recovered three major clades, here recognised as Echimyidae, Octodontidae, and Abrocomidae. Taxa previously a...

The Caviidae (Rodentia) are taxonomically diverse caviomorphs. Their fossil record is abundant and their oldest representatives date back to the middle/late Miocene. The genus Galea Meyen includes small-sized species, exclusively distributed in South America. In this work we describe new remains of Galea (Rodentia, Caviidae) from the Toropí Formati...

DEFINITION OF THE GENUS EUMYSOPS AMEGHINO, 1888 (RODENTIA, ECHIMYIDAE) AND SYSTEMATICS OF THE SPECIES FROM THE EARLY PLIOCENE OF CENTRAL ARGENTINA A definition of the genus Eumysops Ameghino and a systematic review of its oldest species, E. laeviplicatus Ameghino and E. formosus Ameghino, from the early Pliocene of the Monte Hermoso and “Irene” For...

The Monte Hermoso Formation (Farola Monte Hermoso, Buenos Aires Province, early Pliocene) is very important because it is the type locality of biostratigraphic units of the South American mammal bearing Pliocene. These deposits were the base for the recognition of the Montehermosan and Lower Chapadmalalan stages/ages. The correlation of this unit,...

The evolutionary pattern of the molar morphology of the small caviomorph (Octodontidae) Neophanomys from the late Miocene Cerro Azul Formation of central Argentina is analyzed. Two new species (chronomorphs) are recognized, which constitute an anagenetically evolving lineage with a gradual and directional pattern of increasing molar hypsodonty. Den...

Caviomorphs are a clade of South American rodents recorded at least since the early Oligocene (> 31.5 Ma) that exhibit ample eco-morphological variation. It has been proposed that phylogenetic structure is more important than ecological factors for understanding mandibular shape variation in this clade. This was interpreted as a result of the long-...

Among the ecomorphologically diverse Octodontoidea rodents, fossorial habits are prevalent in Ctenomyidae and Octodontidae and occur in some members of Echimyidae. To detect traits linked to scratch-digging, we analyzed morpho-structural variation in the carpus and metacarpus of 27 species of extinct and living octodontoids with epigean, fossorial...

We analyzed mandible shape variation of 17 genera belonging to three superfamilies (Cavioidea, Chinchilloidea, and Octodontoidea) of South American caviomorph rodents using geometric morphometrics. The relative influence of phylogeny and ecology on this variation was assessed using phylogenetic comparative methods. Most morphological variation was...

A new species of Ctenomyidae from the late Pliocene of Uquía Formation (northwestern Argentina) is described. The new remains consist of a fragmentary rostrum, and a left mandible with partial lower dentition. Its phylogenetic affinity and morphological specializations for tooth-digging support its assignation to the South American rodent genus Cte...

Ontogenetic allometries of craniomandibular and dental features linked to digging were analyzed in 5 species of the South American subterranean rodent Ctenomys (tuco-tucos). With the exception of upper incisor procumbency, variables showed high correlation with overall skull size. In particular, craniomandibular variables related to the production...

Correlations among stratigraphic sequences of the continental late Cenozoic of southeastern Buenos Aires province have been historically based on lithostratigraphy and paleontological content. Recent magnetostratigraphic studies supplied new evidence which, together with biostratigraphy, allowed improvement of the chronostratigraphic framework. Rec...

To examine the evolution of burrowing specializations in the sister families Octodontidae and Ctenomyidae (Rodentia: Caviomorpha), we produced a synthetic phylogeny (supertree), combining both molecular and morphological phylogenies, and including both fossil and extant genera. We mapped morphological specializations of the digging apparatus onto o...