Tracing the Paleobiology of Paedotherium and Tremacyllus (Pachyrukhinae, Notoungulata), the Latest Sciuromorph South American Native Ungulates – Part II: Orbital, Auditory, and Occipito-Cervical Regions

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

Tracing the Paleobiology of Paedotherium and Tremacyllus (Pachyrukhinae, Notoungulata), the Latest Sciuromorph South American Native Ungulates – Part I: Snout and Masticatory Apparatus

(2020) Marcos D. Ercoli et al.   JOURNAL OF MAMMALIAN EVOLUTION

Unravelling the distinctive craniomandibular morphology of the Plio‐Pleistocene Eumysops in the evolutionary setting of South American octodontoid rodents (Hystricomorpha)

(2019) A. Itatí Olivares et al.   PALAEONTOLOGY

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

Skull Ontogeny of the Hyraxes Procavia capensis and Dendrohyrax arboreus (Procaviidae: Hyracoidea)

(2018) S. Rocío Moyano et al.   JOURNAL OF MAMMALIAN EVOLUTION

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

Differential influences of allometry, phylogeny and environment on the rostral shape diversity of extinct South American notoungulates

(2018) Helder Gomes Rodrigues et al.   Royal Society Open Science

A phylogenetic test of adaptation to deserts and aridity in skull and dental morphology across rodents

(2018) Bader H Alhajeri et al.   JOURNAL OF MAMMALOGY

First skeleton of the notoungulate mammal Notostylops murinus and palaeobiology of Eocene Notostylopidae

(2018) Malena Lorente et al.   LETHAIA

Functional analyses of the primate upper cervical vertebral column

(2017) Thierra K. Nalley et al.   JOURNAL OF HUMAN EVOLUTION

The tarsal-metatarsal complex of caviomorph rodents: Anatomy and functional-adaptive analysis

(2017) Adriana M. Candela et al.   JOURNAL OF MORPHOLOGY

A potential link between lateral semicircular canal orientation, head posture, and dietary habits in extant rhinos (Perissodactyla, Rhinocerotidae)

(2017) Rico Schellhorn   JOURNAL OF MORPHOLOGY

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

Why pacaranas never say no: analysis of the unique occipitocervical configuration of †Tetrastylus intermedius Rovereto, 1914, and other dinomyids (Caviomorpha; Dinomyidae)

(2017) Alicia Álvarez et al.   JOURNAL OF VERTEBRATE PALEONTOLOGY

Phylogeny and paleobiogeography of Hegetotheriidae (Mammalia, Notoungulata)

(2017) Federico D. Seoane et al.   JOURNAL OF VERTEBRATE PALEONTOLOGY

Evolution and function of anterior cervical vertebral fusion in tetrapods

(2016) Collin S. VanBuren et al.   BIOLOGICAL REVIEWS

Myology of the Head, Neck, and Thoracic Region of the Lesser Grison (Galictis cuja) in Comparison with the Red Panda (Ailurus fulgens) and Other Carnivorans: Phylogenetic and Functional Implications

(2016) Marcos D. Ercoli et al.   JOURNAL OF MAMMALIAN EVOLUTION

Craniodental ontogeny of the pacaranaDinomys branickiiPeters 1873 (Rodentia, Hystricognathi, Caviomorpha, Dinomyidae)

(2015) Norma L. Nasif et al.   JOURNAL OF MAMMALOGY

Leftover prey remains: a new taphonomic mode from the Late Miocene Cerro Azul Formation of Central Argentina

(2015) Claudia I. Montalvo et al.   LETHAIA

Ecological correlates to cranial morphology in Leporids (Mammalia, Lagomorpha)

(2015) Brian P. Kraatz et al.   PeerJ

The Cervical Osteology of Okapia johnstoni and Giraffa camelopardalis

(2015) Melinda Danowitz et al.   PLoS One

The Serrialis Bone, Interparietals, “X” Elements, Entotympanics, and the Composition of the Notoungulate Caudal Cranium

(2014) R.D.E. MacPhee   BULLETIN OF THE AMERICAN MUSEUM OF NATURAL HISTORY

Ecological and phylogenetic dimensions of cranial shape diversification in South American caviomorph rodents (Rodentia: Hystricomorpha)

(2013) Alicia Álvarez et al.   BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY

Ecomorphology of Mammalian Fossil Lineages: Identifying Morphotypes in a Case Study of Endemic South American Ungulates

(2013) Norberto Pedro Giannini et al.   JOURNAL OF MAMMALIAN EVOLUTION

The Placental Mammal Ancestor and the Post-K-Pg Radiation of Placentals

(2013) M. A. O'Leary et al.   SCIENCE

Basicranial Morphology and Relationships of Antillean Heptaxodontidae (Rodentia, Ctenohystrica, Caviomorpha)

(2012) R. D. E. MacPhee   BULLETIN OF THE AMERICAN MUSEUM OF NATURAL HISTORY

Patterns of covariation in the masticatory apparatus of hystricognathous rodents: Implications for evolution and diversification

(2012) Lionel Hautier et al.   JOURNAL OF MORPHOLOGY

Bite force and jaw biomechanics in the subterranean rodent Talas tuco-tuco (Ctenomys talarum) (Caviomorpha: Octodontoidea)

(2011) Federico Becerra et al.   CANADIAN JOURNAL OF ZOOLOGY

Phylogeny of the Notoungulata (Mammalia) based on cranial and dental characters

(2011) Guillaume Billet   JOURNAL OF SYSTEMATIC PALAEONTOLOGY

Morphology and function of the hyoid apparatus of fossil xenarthrans (mammalia)

(2010) Leandro M. Pérez et al.   JOURNAL OF MORPHOLOGY

Cranial Muscles of the Sulawesi Babirusa (Babyrousa celebensis)

(2009) A. F. L. M. Kneepkens et al.   ANATOMIA HISTOLOGIA EMBRYOLOGIA

Craniodental anatomy of late Oligocene archaeohyracids (Notoungulata, Mammalia) from Bolivia and Argentina and new phylogenetic hypotheses

(2009) GUILLAUME BILLET et al.   ZOOLOGICAL JOURNAL OF THE LINNEAN SOCIETY

Convergences in Scapula Morphology among Small Cursorial Mammals: An Osteological Correlate for Locomotory Specialization

(2008) Lauren Seckel et al.   JOURNAL OF MAMMALIAN EVOLUTION