New Miocene rodents from Patagonia (Argentina) and their bearing on the early radiation of the octodontoids (Hystricognathi)

Vucetich, Marı́a Guiomar; Kramarz, Alejandro Gustavo

doi:10.1671/0272-4634(2003)023[0435:nmrfpa]2.0.co;2

Cited by 36 publications

(51 citation statements)

References 8 publications

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“…Butler (1985) proposed that the molar morphology of caviomorphs is at an evolutionary grade in which the occlusal surface is a flattened grinding area adjusted to a single chewing movement, a simplification of the two-phase chewing of cuspidate molars. More recent findings have shown the existence of cuspidate patterns in early caviomorphs Antoine et al 2012), at least in juvenile stages (see e.g., Vucetich and Verzi 1996;Vucetich and Kramarz 2003;Vucetich and Vieytes 2006). In any case, Butler's proposal seems to be the rule for modern octodontoids (from the late Miocene on) and even for adult individuals of earlier species.…”

Section: Morphology Of Lower Molars and Nomenclature Of Crestsmentioning

confidence: 96%

“…Both Ctenomyinae and Octodontinae cluster traditional (euhypsodont) representatives of each subfamily along with genera that were previously classified as Echimyidae, as Octodontoidea with uncertain affinities, or as stem Octodontoidea (Appendix). In this arrangement, Octodontinae includes the 'acaremyids' †Platypittamys and †Acaremys (including †Sciamys) as in Wood and Patterson (1959;see also Winge 1941:190), as well as the more recently described 'acaremyid' †Galileomys (Vucetich and Kramarz 2003) and the taxa †Plesiacarechimys, †Acarechimys minutus, and †Acarechimys minutissimus. The topology of living Octodontinae is consistent with previous molecular phylogenies (Gallardo and Kirsch 2001;Honeycutt et al 2003;Opazo 2005;Upham and Patterson 2012), and only the position of the mountain degu Octodontomys was unstable (cf.…”

Section: Delimitation Of Higher Taxamentioning

confidence: 99%

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Contrasting Phylogenetic and Diversity Patterns in Octodontoid Rodents and a New Definition of the Family Abrocomidae

et al. 2015

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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 than interpreted so far. Early Abrocomidae are recognized for the first time, and a new definition of the family is provided. Traditionally accepted fossil-based times of origin for the southern clades are reinterpreted as later stages of differentiation markedly uncoupled from the origin, differentiation implying specializations for open environments as shown in a morphospace of skull variation. Origin of crown groups is also strongly uncoupled from origin of clades as a consequence of extinction of deep lineages. In the resulting diversity pattern of modern southern clades of octodontoids, the combination of greater disparity, less content of evolutionary history, and lower taxonomic diversity, compared to their northern counterparts, appears at first counterintuitive. We propose that primary components of diversity derived from evolutionary transformation or anagenesis, on the one hand, and from cladogenesis and extinction, on the other, should not be considered associated, or at least not necessarily. Certain patterns of relationships between these distinct components could be driven by environmental dynamics. Like environments, octodontoid diversity would have been more stable in northern South America, whereas in the south, both strong adaptive change and extinction would have been triggered by emerging derived environments.

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Section: Morphology Of Lower Molars and Nomenclature Of Crestsmentioning

confidence: 96%

Section: Delimitation Of Higher Taxamentioning

confidence: 99%

Contrasting Phylogenetic and Diversity Patterns in Octodontoid Rodents and a New Definition of the Family Abrocomidae

et al. 2015

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“…Extant Octodontoidea includes the Octodontidae, Ctenomyidae, Echimyidae, Abrocomidae, and Capromyidae (Woods and Kilpatrick 2005;Fabre et al 2013). Octodontoids from the Oligocene-middle Miocene represent different and independent lineages that are not directly related to modern families (Vucetich and Kramarz 2003;Arnal 2012;Arnal and Pérez 2013;Arnal et al 2014;Arnal and Vucetich 2015; but see Verzi et al 2014). One of these basal lineages is represented by Prospaniomys (Arnal 2012;Arnal et al 2014), which is a monospecific octodontoid genus represented by Prospaniomys priscus from the Patagonian early Miocene (Colhuehuapian South American Land Mammal Age, SALMA).…”

Section: Introductionmentioning

confidence: 99%

First Approach to the Paleobiology of Extinct Prospaniomys (Rodentia, Hystricognathi, Octodontoidea) Through Head Muscle Reconstruction and the Study of Craniomandibular Shape Variation

Álvarez

Arnal

2015

J Mammal Evol

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†Prospaniomys is a basal octodontoid recorded in the early Miocene in Patagonia (Argentina; Colhuehuapian SALMA). Nearly complete cranial and mandibular remains known for this genus provide a unique opportunity to explore its paleobiology. For this, masticatory muscles were reconstructed and craniomandibular shape variation assessed. While such reconstruction indicates that most masticatory muscles would have presented moderate development, both the masseter lateralis and posterior muscles were poorly developed. In contrast, we found that the temporalis muscle was well developed, while conspicuous postorbital constriction, postorbital processes, and superior temporal lines revealed a substantial orbital portion of this muscle. According to geometric morphometric results, craniomandibular shape was interpreted as generalized. Features such as shortened palate, narrower bizygomatic width, orthodont incisors, enlarged incisive foramina, and a shallow jaw could be linked to epigean habits. The moderate development of auditory bullae in Prospaniomys suggests that it is unlikely that it may have lived in extreme arid environments. Additionally, based on its generalized dental morphology, an omnivorous or generalized herbivorous diet that may have included leaves, fruit, and potentially animal matter was inferred. By the early Miocene, Patagonia experienced the initial expansion stage of arid-adapted vegetation, with grasses present in low amounts and abundant forests. Generalized habits and soft and nonabrasive diet suggest that Prospaniomys was possibly associated with more closed environments. Morphology alone cannot be used as an environmental proxy, but it could undoubtedly contribute to the interpretations based on data provided by paleobotanical and geological frameworks in studies on the evolution of environments.

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“…Eosteiromys is also found in the Pinturas Formation (Santa Cruz Province, Argentina; Kramarz, 2004). Eoviscaccia is also recorded in some Deseadan localities such as Cabeza Blanca (Chubut Province, Argentina) and Lacayani (Bolivia) (Vucetich, 1989), and in the Tinguirirican locality of Chile (Bertrand et al, 2012), whereas Galileomys is found in Cañadon del Tordillo ("Colloncuran" SALMA, Neuquén Province; Vucetich & Kramarz, 2003) and Pinturas Formation (Kramarz, 2004). Leucokephalos (exclusive of the Deseadan age; Vucetich et al, 2015b) come from Cabeza Blanca.…”

Section: Discussionmentioning

confidence: 99%

First record of Banderomys leanzai Kramarz, 2005 (Rodentia, Caviomorpha) in Chubut Province, Patagonia (Argentina)

Busker

Pérez

Krause

et al. 2017

MACN

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New Miocene rodents from Patagonia (Argentina) and their bearing on the early radiation of the octodontoids (Hystricognathi)

Cited by 36 publications

References 8 publications

Contrasting Phylogenetic and Diversity Patterns in Octodontoid Rodents and a New Definition of the Family Abrocomidae

Contrasting Phylogenetic and Diversity Patterns in Octodontoid Rodents and a New Definition of the Family Abrocomidae

First Approach to the Paleobiology of Extinct Prospaniomys (Rodentia, Hystricognathi, Octodontoidea) Through Head Muscle Reconstruction and the Study of Craniomandibular Shape Variation

First record of Banderomys leanzai Kramarz, 2005 (Rodentia, Caviomorpha) in Chubut Province, Patagonia (Argentina)

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