Geomys bursarius (Rodentia: Geomyidae)

Connior, Matthew B.

doi:10.1644/879.1

Cited by 23 publications

(16 citation statements)

References 111 publications

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“…Within Geomys , we do find the M3 to be generally more commonly bicolumnar in the pinetis group than in the bursarius group. Although Connior () suggested that G. bursarius is difficult to identify on the basis of dental morphology, our results indicate that the shapes of M3 and p4 are useful in identifying this taxon. Our analysis of tooth shape within Orthogeomys confirms that the morphology of the posterior loph of M3 can be used to distinguish the three subgenera of Orthogeomys .…”

Section: Discussioncontrasting

confidence: 53%

“…The extant sample (Table ) includes 214 M3s and 196 p4s representing four genera and 16 species (67% of the genera and 40% of the species of extant geomyine gophers). Both male and female specimens were included in the analysis to account for the extreme sexual dimorphism of gophers (Connior ; Mathis et al . ).…”

Section: Methodsmentioning

confidence: 99%

“…Although often diagnosed by soft tissue features and genetic characteristics (e.g. Connior ; Keinath et al . ; Mathis et al .…”

Section: Previous Taxonomic Diagnoses Of Gopher Speciesmentioning

confidence: 99%

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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: Discussioncontrasting

confidence: 53%

Section: Methodsmentioning

confidence: 99%

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

Calede

Glusman

2017

Palaeontology

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“…Table 1 includes the abbreviation used to represent each animal, the scientific name for each, and the suborder of each rodent. Information about behavioral characteristics of these animals was obtained from several sources (Nelson, 1930; Boorer, 1971; Gulotta, 1971; Hoogland, 1996; Nowak, 1999; Martin et al, 2001; Samuels and Van Valkenburgh, 2008; Connor, 2011) in case there might be some correlation with hearing ability. Characteristics noted include locomotor category (arboreal, terrestrial, fossorial, semifossorial, and saltatorial) and time of major activity (diurnal, nocturnal, crepuscular, and both day and night).…”

Section: Methodsmentioning

confidence: 99%

Volumes of cochlear nucleus regions in rodents

et al. 2016

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The cochlear nucleus receives all the coded information about sound from the cochlea and is the source of auditory information for the rest of the central auditory system. As such, it is a critical auditory nucleus. The sizes of the cochlear nucleus as a whole and its three major subdivisions – anteroventral cochlear nucleus (AVCN), posteroventral cochlear nucleus (PVCN), and dorsal cochlear nucleus (DCN) - have been measured in a large number of mammals, but measurements of its subregions at a more detailed level for a variety of species have not previously been made. Size measurements are reported here for the summed granular regions, DCN layers, AVCN, PVCN, and interstitial nucleus in 15 different rodent species, as well as a lagomorph, carnivore, and small primate. This further refinement of measurements is important because the granular regions and superficial layers of the DCN appear to have some different functions than the other cochlear nucleus regions. Except for DCN layers in the mountain beaver, all regions were clearly identifiable in all the animals studied. Relative regional size differences among most of the rodents, and even the 3 non-rodents, were not large and did not show a consistent relation to their wide range of lifestyles and hearing parameters. However, the mountain beaver, and to a lesser extent the pocket gopher, two rodents that live in tunnel systems, had relative sizes of summed granular regions and DCN molecular layer distinctly larger than those of the other mammals. Among all the mammals studied, there was a high correlation between the size per body weight of summed granular regions and that of the DCN molecular layer, consistent with other evidence for a close relationship between granule cells and superficial DCN neurons.

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“…The residents of Rainbow altered the landscape by managing wild plants and tending small scale gardens of Cucurbita squash; they may have also potentially used fire to manage the prairie landscape and create attractive clearings for game such as deer and bison (Hammett 1992;Russell 1983;Smith 2009;Truett et al 2001). Fire used to encourage the presence of grassland as graze for large herbivores might also consequently attract pocket gophers, though soil properties seem to be more important to pocket gopher distribution than the herbaceous make-up of the habitat (Connior 2011).…”

Section: Niche Construction and Garden Gamementioning

confidence: 99%

Hunt, gather, garden

Wismer¹

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Several individuals and institutions made the research included in this dissertation possible. John Cordell (Iowa Office of the State Archaeologist) was instrumental in providing access to the many collections examined in this dissertation. Dr. Destiny Crider (Luther College) and her students worked quickly to organize collections so they could be included in this research. Tiffany Adrain (University of Iowa) connected me to additional materials.

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Geomys bursarius (Rodentia: Geomyidae)

Cited by 23 publications

References 111 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)

Volumes of cochlear nucleus regions in rodents

Hunt, gather, garden

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