Tooth Size Variation in Assemblages of Tremacyllus (Hegetotheriidae, Notoungulata): Insights into Geographical Gradients, Systematics, and Sexual Dimorphism

Segmental Series and Size: Clade-Wide Investigation of Molar Proportions Reveals a Major Evolutionary Allometry in the Dentition of Placental Mammals

(2021) Guillaume Billet et al.   SYSTEMATIC BIOLOGY

The Great American Biotic Interchange revisited: a new perspective from the stable isotope record of Argentine Pampas fossil mammals

(2020) Laura Domingo et al.   Scientific Reports

Sedimentological analysis and radioisotopic age of the Las Cañas Formation in Dulce river outcrops, Río Hondo, Santiago del Estero (Northwestern Argentina)

(2020) Matías A. Armella et al.   JOURNAL OF SOUTH AMERICAN EARTH SCIENCES

More than 40 remains of Tremacyllus Ameghino 1891 (Notoungulata, Hegetotheriidae, Pachyrukhinae) from La Pampa Province (Argentina) are analyzed. They were recovered from different outcrops of the late Miocene Cerro Azul Formation at Laguna Chillhué, Quehué, Telén, Salinas Grandes de Hidalgo, Estancia Ré, Bajo Giuliani, Barrancas Coloradas and Caleufú. During the late Miocene, pachyrukhines are represented by two genera, Tremacyllus and Paedotherium. The present sample of Tremacyllus allows dental morphological variation to be evaluated, especially in lower and upper premolars. This study shows high variability in the diagnostic characters of two purported species, T. impressus (Pliocene-Pleistocene of the Pampean Region) and T. incipiens (late Miocene of Catamarca). We interpret these differences to actually correspond to intraspecific variation and, consequently, propose their synonymy. T. impressus has priority over T. incipiens, and an emended diagnosis is provided. This nomenclatural action implies, in turn, the extension of the biochron of Tremacyllus impressus from the late Miocene to the Pleistocene. T. impressus differs from Paedotherium in its smaller size, the presence of post-incisive impressions that extend beyond the level of P2 (reaching the anterior margin of P3), M3 shorter or equal to M2, relatively shorter mandibular symphysis, and lower premolars not molariform and more imbricated. Within the studied sample, we identify several juvenile specimens that confirm the dental eruption pattern previously proposed for Tremacyllus based on fewer remains.

(2018) Renata Sostillo et al.   AMEGHINIANA

Systematic and morphogeometric analyses of Pachyrukhinae (Mammalia, Hegetotheriidae) from the HuayquerÍas, Mendoza (Argentina): biostratigraphic and evolutionary implications

(2018) Bárbara Vera et al.   JOURNAL OF VERTEBRATE PALEONTOLOGY

Mode testing, critical bandwidth and excess mass

(2018) Jose Ameijeiras-Alonso et al.   TEST

Dental shape variation of Neogene Pachyrukhinae (Mammalia, Notoungulata, Hegetotheriidae): systematics and evolutionary implications for the late Miocene Paedotherium species

(2017) M. D. Ercoli et al.   JOURNAL OF SYSTEMATIC PALAEONTOLOGY

Ontogenetic variations and structural adjustments in mammals evolving prolonged to continuous dental growth

(2017) Helder Gomes Rodrigues et al.   Royal Society Open Science

Deciduous dentition and eruption pattern in late Miocene Pachyrukhinae (Hegetotheriidae, Notoungulata) from La Pampa Province, Argentina

(2016) Esperanza Cerdeño et al.   HISTORICAL BIOLOGY

Phylogenetic revision of the South American notopithecines (Mammalia: Notoungulata)

(2015) Bárbara Vera   JOURNAL OF SYSTEMATIC PALAEONTOLOGY

The Hegetotheriidae (Mammalia, Notoungulata) assemblage from the late Oligocene of Mendoza, central-western Argentina

(2015) Esperanza Cerdeño et al.   JOURNAL OF VERTEBRATE PALEONTOLOGY

mixtools: AnRPackage for Analyzing Finite Mixture Models

(2015) Tatiana Benaglia et al.   Journal of Statistical Software

Momocs: Outline Analysis UsingR

(2015) Vincent Bonhomme et al.   Journal of Statistical Software

A Paleolatitude Calculator for Paleoclimate Studies

(2015) Douwe J. J. van Hinsbergen et al.   PLoS One

Biostratigraphy and biochronology of the Monte Hermoso Formation (early Pliocene) at its type locality, Buenos Aires Province, Argentina

(2013) Rodrigo L. Tomassini et al.   JOURNAL OF SOUTH AMERICAN EARTH SCIENCES

Bergmann's Rule - what's in a name?

(2010) Shai Meiri   GLOBAL ECOLOGY AND BIOGEOGRAPHY

Enamel ridge alignment in upper molars of ruminants in relation to their natural diet

(2010) T. M. Kaiser et al.   JOURNAL OF ZOOLOGY

The scale of it all: postcanine tooth size, the taxon-level effect, and the universality of Gould's scaling law

(2010) Lynn E. Copes et al.   PALEOBIOLOGY

Static allometry of mammalian teeth and the correlation of tooth size and body size in contemporary mammals

(2009) G. Ken Creighton   JOURNAL OF ZOOLOGY