The first Late Eocene continental faunal assemblage from tropical North America

Jiménez-Hidalgo, Eduardo; Smith, Krister T.; Guerrero-Arenas, Rosalía; Alvarado‐Ortega, Jesús

doi:10.1016/j.jsames.2014.12.001

Cited by 32 publications

(20 citation statements)

References 47 publications

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“…The first geomyids, from the extinct subfamily Entoptychinae, are found in 34 million year old deposits of southern Mexico (Jiménez‐Hidalgo et al . ). Entoptychines became particularly abundant a few million years later, around 30 million years ago (earliest Arikareean North American Land Mammal ‘age’; Tedford et al .…”

Section: Previous Taxonomic Diagnoses Of Gopher Speciesmentioning

confidence: 97%

Geometric morphometric analyses of worn cheek teeth help identify extant and extinct gophers (Rodentia, Geomyidae)

Calede

Glusman

2017

Palaeontology

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Studies of the biostratigraphy and palaeoecology of fossil vertebrate assemblages require large samples of accurately identified specimens. Such analyses can be hampered by the inability to assign isolated and worn remains to specific taxa. Entoptychine gophers are a diverse group of burrowing rodents found in Oligo‐Miocene deposits of the western United States. In both entoptychines and their extant relatives the geomyines, diagnostic characters of the occlusal surface of the teeth are modified with wear, making difficult the identification of many isolated fossil teeth. We use geometric morphometrics to test the hypothesis that tooth shape informs taxonomic affinities and expected levels of morphological variation across gopher taxa. We also incorporate data from microcomputer tomography to investigate changes in occlusal surface shape through wear within individuals. Our analyses demonstrate the usefulness of our approach in identifying extant geomyines to the genus, subgenus and species levels, and fossil entoptychines to the genus and, in some cases, the species level. Our results cast doubt on the validity of some species within Entoptychus and suggest future revisions to entoptychine taxonomy. The amounts of morphological divergence observed among fossil and extant genera are similar. Fossil species do not differ greatly from extant ones in that regard either. Further work evaluating the morphological variation within and across entoptychine species, including unworn teeth and osteological material, will allow revised analyses of the biostratigraphy and palaeoecology of important Oligo‐Miocene mammalian assemblages of the western United States and help to infer the phylogenetic relationships and evolution of gophers.

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Section: Previous Taxonomic Diagnoses Of Gopher Speciesmentioning

confidence: 97%

Geometric morphometric analyses of worn cheek teeth help identify extant and extinct gophers (Rodentia, Geomyidae)

Calede

Glusman

2017

Palaeontology

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“…The specimens were selected for their completeness and preservation quality. They were collected in outcrops of the Yolomécatl Formation, in southern Mexico (for detailed description of the area and the location of localities, see Jiménez-Hidalgo et al, 2015. All the specimens come from a single stratigraphic level.…”

Section: Methodsmentioning

confidence: 99%

How much variation is in the shape of fossil pupation chambers? An exploratory geometric morphometric analysis of Fictovichnus gobiensis from the Late Eocene of Oaxaca, southern Mexico

Guerrero-Arenas¹,

Zúñiga-Marroquin²,

Jiménez-Hidalgo³

2018

BSGM

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cámaras pupales fosilizadas producidas por coleópteros, por medio de morfometría geométrica. El objetivo del análisis fue analizar diversos conjuntos de cámaras pupales con forma similar, indicativos de varios coleópteros productores. Los 42 ejemplares analizados proceden de afloramientos del Eoceno tardío, en los alrededores del poblado de Santiago Yolomécatl, noroeste de Oaxaca. En los ejemplares se registraron 2 marcas y 34 semimarcas para coordenadas cartesianas en 2 dimensiones. La variación de la forma se analizó con distancias Procrustes como una medida de similitud; el método de agrupamiento de pares con la media aritmética no ponderada se utilizó para el análisis de los agrupamientos, así como un análisis de componentes principales y un análisis de variantes canónicas para explorar la variación de formas y las diferencias entre los grupos. La forma elipsoidal de las cámaras es variable, pero fue posible distinguir 4 morfos principales, lo cual sugiere que existen 4 productores posibles. Los morfos reconocidos en este estudio representan una evidencia indirecta de la diversidad de escarabajos, la cual no está preservada directamente en el registro fósil. Análisis futuros de cámaras pupales de coleópteros recientes permitirán establecer la naturaleza de los productores. Investigaciones adicionales podrán establecer si existen más morfos en muestras más numerosas procedentes de las localidades de Yolomécatl.

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“…Lithological units represent a fluviolacustrine succession with several paleosol horizons (Fig 2). Stratigraphical description of the study zone had previously been reported in detail [5][6][7].…”

Section: Geological Settingmentioning

confidence: 99%

Burrow systems evince non-solitary geomyid rodents from the Paleogene of southern Mexico

2020

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We describe a new complex burrow system produced by geomyids in southern Mexico. Yaviichnus inyooensis igen. isp. nov. is composed of main large chambers near the top of the paleosol, from which shafts showing different morphologies and orientations radiate, some of them ending in or connected to small deeper chambers. Gregorymys spp. is proposed as the producer based on its fossorial habits, abundance in the outcrops, presence of remains inside the burrows, and paired grooves in the walls, which are compatible with the traces of geomyid incisors. The complexity of these burrows attests to an extended underground life that would have been triggered by semiarid to arid conditions. Morphological complexity also suggests that the burrows were excavated and inhabited by more than one individual, indicating that Oligocene Gregorymys of southern Mexico would be a unique gregarious geomyid.

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The first Late Eocene continental faunal assemblage from tropical North America

Cited by 32 publications

References 47 publications

Geometric morphometric analyses of worn cheek teeth help identify extant and extinct gophers (Rodentia, Geomyidae)

Geometric morphometric analyses of worn cheek teeth help identify extant and extinct gophers (Rodentia, Geomyidae)

How much variation is in the shape of fossil pupation chambers? An exploratory geometric morphometric analysis of Fictovichnus gobiensis from the Late Eocene of Oaxaca, southern Mexico

Burrow systems evince non-solitary geomyid rodents from the Paleogene of southern Mexico

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