María Encarnación Pérez

María Encarnación Pérez
Museo Paleontológico Egidio Feruglio

PhD

About

49
Publications
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956
Citations
Citations since 2016
21 Research Items
707 Citations
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120

Publications

Publications (49)
Article
Full-text available
Hystricognath rodents arrived in South America from Africa during the Paleogene. The oldest South American rodents (Caviomorpha) were intensively studied in recent years. One of these assemblages is the caviomorph paleofauna from Santa Rosa, Peru. Their age was originally estimated as ?Eocene. Here, we report new caviomorph fossils from Santa Rosa...
Article
Full-text available
The Subfamily Dolichotinae comprises two living species, Dolichotis patagonum, an emblematic component of the Patagonian fauna of Argentina, and Dolichotis salinicola, endemic to the Chaco ecoregion. These two species are also considered as pertaining to different genera, D. patagonum and Pediolagus salinicola. The oldest records of Dolichotis come...
Article
Late Oligocene caviomorphs represent one of the most important early adaptive radiations of this group of rodents. They show a high taxonomic diversity and a wide geographic distribution, with those found in the upper Oligocene of Salla (Bolivia) and Patagonia (Argentina) being particularly diverse. However, caviomorphs from the Deseadan South Amer...
Poster
Full-text available
Caviomorphs are a diverse group of South American rodents exhibiting broad ecological and morphological diversity, and variable habits. Between them, the cavioid “Prodolichotis” pridiana Field, from the middle Miocene of La Venta (Colombia) is the sister-group of the striking Caviidae (current maras, capybaras, and guinea-pig relatives). A microCT...
Article
The Miocene represents a key moment in the South American evolution, since meaningful geographic and climatic processes occurred, promoting the development of several biologic changes. The isolation of South America together with major global and regional climatic changes resulted in an enormous variety of biomes and endemic diversity of flora and...
Article
Full-text available
Fossil rodents from the Río Santa Cruz (RSC) classic localities (Santa Cruz Formation, Early–Middle Miocene) are known by the works of F. Ameghino and W.B. Scott since the end of the 19th and beginning of the 20th centuries. These caviomorph rodents have not been comprehensively reviewed since then. In this contribution, we studied new fossil speci...
Article
Full-text available
A new genus and species of chinchilloid rodent is described here. It was found in Colhue-huapian levels (early Miocene) of the localities of Bryn Gwyn and Gran Barranca, Chubut Province, Argentina. The new taxon shows a unique combination of characters (e.g., pro-tohypsodont teeth, upper molars trilophodont, m1 and m2 tri-or tetralophodont with the...
Article
Cavioids are one of the most eco-morphologically divergent clades among South American caviomorph rodents. In an unique way, they display three mandibular morpho-types which are linked to the relative positions and relations among masseteric muscles. The derived configuration present in Caviidae would be linked to a preponderance of grinding functi...
Conference Paper
Full-text available
The continental early Miocene Santa Cruz Formation (SCF) is widely distributed in southern Patagonia. It fossil mammals comprise the basis of the Santacrucian Land Mammal Age. Fossil prospecting of exposures along the southern escarpment of Río Chalía have been neglected until now. They represent the greatest known aerial exposure and sedimentary t...
Article
Caviomorph rodents have been an important component of South American mammal faunas at least since the Oligocene. Those from the Deseadan South American Land Mammal Age (SALMA; late Oligocene) have been exhaustively studied because they are considered key to understanding the evolution of South American rodents. Deseadan faunas are widely distribut...
Article
Full-text available
Caviidae is one of the groups of rodents with the greatest ecomorphological disparity, and with currently three known lineages: Caviinae (cuises), Dolichotinae (maras), and Hydrochoerinae (capybaras). Caviinae include small caviids represented by three extant genera (Microcavia, Cavia, and Galea) and three fossils forms (Dolicavia, Palaeocavia, and...
Article
Full-text available
Cephalomyidae was established in the XIX century, and was considered by different authors as a heterogeneous group of hypsodont South American hystricognath rodents. Other authors corroborated this family as a natural group among caviomorphs and recognized some taxa recorded from the Deseadan-Colhuehuapian South American Land Mammals Ages (SALMAs)....
Article
Full-text available
A new hydrochoerine rodent, Cardiatherium calingastaense sp. nov. (Caviidae), is described based on the specimen INGEO-PV 87. It was recovered from the late Miocene Las Flores Formation, cropping out at the Puchuzum locality, San Juan Province, Argentina. The new species is based on a particular combination of characters, among which the following...
Article
Objectives: The purpose of this work is to present a new primate locality with evidence that increases the knowledge on the radiation of the extinct platyrrhine primates. Materials and methods: We studied the new specimen and compared it to specimens identified as Mazzonicebus almendrae. Results: The new first and second molars were comparable...
Article
Cardiomyine’ rodents are extinct large terrestrial Caviidae closely related to capybaras, that inhabited large parts of South America during the middle Miocene and Pliocene. They are mostly preserved as isolated teeth, but also as skull and jaw fragments. Here we revise the taxonomy of this group and describe two new species, each pertaining to one...
Article
Full-text available
One of the most striking components of the modern assemblage of South American mammals is the semiaquatic capybara (Caviidae, Hydrochoerinae), the biggest rodent in the world. The large hydrochoerines are recorded from the middle Miocene to the present, mainly in high latitudes of South America. Although less known, they are also recorded in low la...
Chapter
Full-text available
Abstract. The rich fossil record of caviomorph rodents provides good basis for understanding the major trends of their evolution in southern South America. The most important features of their evolutionary history are here analyzed since their entrance during the middle Eocene by rafting from Africa. The initial radiation of caviomorphs was complex...
Article
The family Caviidae is one of the most diverse groups among South American hystricognath rodents and is represented by three main living lineages: Caviinae (cavies), Dolichotinae (maras) and Hydrochoerinae (capybaras). Caviinae includes the smaller forms of caviids represented by the extant Microcavia, Cavia and Galea. They are distributed in a wid...
Article
We provide a synopsis of ~60 million years of life history in Neotropical lowlands, based on a comprehensive survey of the Cenozoic deposits along the Quebra da Cachiyacu near Contamana in Peruvian Amazonia. The 34 fossil-bearing localities identified have yielded a diversity of fossil remains, including vertebrates, mollusks, arthropods, plant fos...
Conference Paper
Full-text available
Se presentan los primeros resultados de estudios multidisciplinarios efectuados en la secuencia continental paleógena del O y NO de Sierra Talquino, donde se analizaron seis perfiles y se comprobaron tres Edades Mamífero (EM). La sucesión examinada comprende el Grupo Río Chico (Formaciones Peñas Coloradas, Las Flores, Koluel-Kaike) y la Formación S...
Article
Full-text available
The new combination Phugatherium dichroplax nov. comb. (Ahearn and Lance) is proposed for the North American species “Neochoerus” dichroplax Ahearn and Lance, and “N.” cordobai Carranza-Castañeda and Miller. Its age range is here expanded (late Early Blancan—latest Blancan; Piacenzian—Gelasian), being the youngest species of Phugatherium and thus e...
Article
Full-text available
Caviomorph rodents, the New World Hystricognathi, are one of the most characteristic groups of South American mammals. Although they have been in the continent at least since the middle Eocene, those of the Deseadan Land mammal Age (early–late Oligocene) are the best source to understanding their early history due of their good record, large geogra...
Chapter
Full-text available
Caviomorph rodents have a very rich fossil record that provided good bases for understanding the major pathways of their evolution, at least in southern South America. The evolution of caviomorphs in intertropical South America is less known, although the knowledge of the Quaternary record has been improved in recent years. In this chapter we analy...
Article
Full-text available
Living capybaras are a unique group of rodents. They have ever-growing cheek teeth with a complicated occlusal morphology that changes even after birth. Concerning fossil capybaras this morphological change, associated with increasing size, led to regard them as taxonomically highly diverse, including small species with simple dental morphology, an...
Article
Full-text available
Octodontoidea is the most diverse caviomorph clade presently represented in South America by Octodontidae, Echimyidae, and Abrocomidae. Some evidence suggests that in the past they were taxonomically even more diverse, including several independent lineages with no modern representatives, sometimes considered as families. One of them is Acaremyidae...
Article
Full-text available
Octodontoidea is the most speciose and ecologically diverse superfamily of caviomorph rodents. The systematic relation-ships of modern octodontoids is moderately accepted, however, the relationships of fossils (from the Eocene?-middle Miocene) are not clear. In recent years the hypothesis of a complex early evolution of the superfamily has emerged,...
Chapter
Full-text available
Caviomorph rodents, the New World Hystricognathi, are one of the most noteworthy groups of mammals in South America. Isolated for more than 30 Ma, they have given rise to several extraordinary rodents including the pacas (Cuniculusspp.), cavies (Caviaspp.), vizcachas (Lagostomusspp.), agouties (Dasyproctaspp.), as well as two giants: Phoberomys, fr...
Article
Cavioidea is represented today by Dasyproctidae (agouties), Cuniculidae (pacas), and Caviidae (cavies or “guinea pigs”, maras, mocos, and capybaras). Cavioidea sensu stricto (Cavioidea s.s.) clusters the extant and extinct Caviidae together with a diverse assemblage of extinct taxa grouped in the family Eocardiidae. Recent phylogenetic analyses of...
Article
Full-text available
Background Caviidae is a diverse group of caviomorph rodents that is broadly distributed in South America and is divided into three highly divergent extant lineages: Caviinae (cavies), Dolichotinae (maras), and Hydrochoerinae (capybaras). The fossil record of Caviidae is only abundant and diverse since the late Miocene. Caviids belongs to Cavioidea...
Data
Supporting information of the phylogenetic analysis conducted on the combined dataset. (DOC)
Data
List of taxa used for the Phylogenetic Analysis and GenBank accession numbers. (DOC)
Data
List of morphological characters used in the phylogenetic analysis. (DOC)
Data
Script for calibrating phylogenetic trees using the chronostratigraphic information for fossil taxa in TNT (calculates MSM*, GER, and provides a calibrated topology in nexus format). (TXT)
Data
Combined data matrix containing molecular and morphological characters in Nexus format. (TNT)
Article
Full-text available
Cavioidea sensu stricto (Cavioidea s.s.) is one of the most divergent lineages within the South American Hystricognathi, and is currently represented by cavies, maras (Caviidae), and capybaras (Hydrochoeridae). Caviids and hydrochoerids have been interpreted as forming the crown group, whereas the stem group of Cavioidea s.s. is formed by “Eocardii...
Article
Full-text available
Asteromys punctus Ameghino was only known from the holotype, found in the Deseadan locality Cabeza Blanca (Chubut Province, Argentina). This species was included in the Family “Eocardiidae” because of its high-crowned cheek teeth and reduction of the mesoflexid-mesofossettid. In turn, “Eocardiidae”, together with Caviidae and Hydrochoeridae, has be...
Article
Full-text available
Hydrochoerinae is a clade of caviomorph rodents broadly distributed in South America, which includes the maximum body size recorded among extant rodent taxa. The most basal forms of this group are an assemblage of small to medium body size extinct taxa with a plesiomorphic dentition, traditionally clustered in the group cardiomyines. One of the old...
Chapter
Coastal exposures of the Santa Cruz Formation in southern Patagonia have been a fertile ground for recovery of Early Miocene vertebrates for more than 100 years. This volume presents a comprehensive compilation of important mammalian groups which continue to thrive today. It includes the most recent fossil finds as well as important new interpretat...
Article
Full-text available
The family Caviidae is represented in modern faunas by cavies and maras, whereas the family Hydrochoeridae is represented by capybaras. The evolutionary origin of these families has been related to a diversity of plesiomorphic fossil forms (recorded from the late Oligocene up to the middle Miocene) traditionally grouped in the family “Eocardiidae”....
Chapter
Full-text available
The discovery of abundant fossil mammals from two different levels of the lowest third of the Chinches Formation (Manantiales basin) located in Cordillera Frontal of San Juan, between 32°30’ and 33°S, is reported. These synorogenic Miocene deposits were deposited by the structural evolution of Cordón de La Ramada fold and thrust belt. Two diverse f...
Article
Full-text available
Cavioidea sensu stricto groups three traditionally recognized families that are characterized by hypsodont, double-heart-shaped cheek teeth and moderate hystricognathy: Eocardiidae, Caviidae, and Hydrochoeridae. Eocardiidae was erected to include a diverse assemblage of extinct and plesiomorphic taxa, whereas Caviidae and Hydrochoeridae (the crown...
Article
Full-text available
Caviidae and Hydrochoeridae (extant Cavioidea s.s.), probably the most peculiar among rodents, are characterized by their evergrowing double-heart-shaped cheekteeth. They have classically been rooted in Eocardiidae, which ranges from Deseadan to 'Colloncuran' (late Oligocene-middle Miocene) in Patagonia, although in the Deseadan and Colhuehuapian (...
Article
Full-text available
Here we describe the oldest rodents from Patagonia, found in the La Cantera level at Gran Barranca, intermediate in age between Tinguirirican and Deseadan South American Land Mammal Age (SALMA). The represented taxa are the Octodontoidea Draconomys verai gen. et sp. nov., Vallehermosomys mazzonii gen. et sp. nov., and Vallehermosomys? merlinae sp....
Article
Full-text available
Sexual dimorphism and morphometric geographic variability of Hybreoleptops aureosignatus (lnsecta: Coleoptera: Cuxculionidae). Abstract: The single most important quantitative variable in animals is, perhaps, body size variability. Body size variability has a great influence on so diverse biological questions as corporal architecture, physiology,...
Article
Hybreoleptops Kuschel was established in a key to Chilean “Leptopini” for four species previously included in other genera. Those species are: H. tuberculifer (Boheman), H. aureosignatus (Blanchard), H. vestitus (Blanchard), and H. xanthomelas (Fairmaire and Germain). The genus is endemic to southern South America, inhabiting the southernmost part...

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Projects (3)
Project
Collaboration studies on the anatomy of the cranial endocast, inner ear, nasal cavity, craniofacial innervation, and vasculature of certain extinct mammalian groups: Cervidae, Rodentia, Cingulata, Notoungulata
Project
Evolución de los roedores Cavioidea y Octodontoidea de Patagonia durante el Oligoceno-Mioceno. Implicancias sistemáticas, filogenéticas, paleoambientales y paleobiogeográficas
Project
Despite the vast biological diversity of extant tropical perhumid ecosystems, they are drastically underinvestigated from a paleobiological perspective. This limits our understanding of the dynamics that underlies the evolution of tropical ecosystems. However, the tropical-equatorial areas of South America (i.e., Amazonian lowlands and Andean highlands) have yielded fossil evidence suggesting that they were already hosting major biodiversity hotspots throughout the Cenozoic. Moreover, South America counts among the most remarkable examples of geographic isolation for the Cenozoic period, reflected by the evolution of a unique flora and fauna. This makes this unique biogeographic region a prime example to scrutinize the impact of global and local events on living and past communities.