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Megalagus brachyodon

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Figure 4. Right lower molar (m2) of Megalagus brachyodon, CM 8620. A) Buccal view. B) Lingual view. C) Labial view. D) Occlusal view. E) Distal view. The asymmetrical enamel and the hiatus at the anterior wall of trigonid is typical of the lagomorphs with unilateral hypsodonty. Note separated roots of the lower molar which is primitive condition characteristic for basal lagomorphs.

Figure 4. Right lower molar (m2) of Megalagus brachyodon , CM 8620. A) Buc...

Published: 01 December 2010
Figure 4. Right lower molar (m2) of Megalagus brachyodon , CM 8620. A) Buccal view. B) Lingual view. C) Labial view. D) Occlusal view. E) Distal view. The asymmetrical enamel and the hiatus at the anterior wall of trigonid is typical of the lagomorphs with unilateral hypsodonty. Note separated
Journal Article

THE USE OF GROSS DENTAL WEAR IN DIETARY STUDIES OF EXTINCT LAGOMORPHS

DANIELLE FRASER, JESSICA M. THEODOR
Published: 01 July 2010
Journal of Paleontology (2010) 84 (4): 720–729.
DOI: https://doi.org/10.1666/09-066.1
... in the Horse Local Fauna, Palaeolagus temnodon and Megalagus brachyodon . Qualitative analysis of the gross dental wear of the lagomorphs of the Horse Local Fauna indicates that M. brachyodon was mainly folivorous and P. temnodon was primarily frugivorous, suggesting that the contemporaneous ecosystem was tree...
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Journal Article

A late Eocene (Chadronian) mammalian fauna from the White River Formation in Kings Canyon, northern Colorado

Karen J. Lloyd, Jaelyn J. Eberle
Published: 01 January 2012
Rocky Mountain Geology (2012) 47 (2): 113–132.
DOI: https://doi.org/10.2113/gsrocky.47.2.113
... , and Leptomeryx ; and the perissodactyls Mesohippus , Megacerops , and Rhinocerotidae. The mammalian fauna corroborates the Chadronian (late Eocene) age of the White River Formation in Kings Canyon suggested by others. The co-occurrence of Megalagus brachyodon , Leptomeryx speciosus , and Pseudoprotoceras...
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View PDF for article title, A late Eocene (Chadronian) mammalian fauna from the White River Formation in Kings Canyon, northern Colorado
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Image
Figure 1. Fossil actinomycetous bacteria from vertical (A, C) and transverse (B, D) sections of an isolated molar (m1 or m2) of Megalagus brachyodon (CM 85804). A) Bacterial microcolonies; note their high density in cementum (right). B) Bacterial colony in cementum passing into enamel (top central right); arrow indicates position of the filament figured in D. C) Abundant filaments in cementum. D) Branching filament passing out of cementum.

Figure 1. Fossil actinomycetous bacteria from vertical (A, C) and transvers...

Published: 01 December 2010
Figure 1. Fossil actinomycetous bacteria from vertical (A, C) and transverse (B, D) sections of an isolated molar (m1 or m2) of Megalagus brachyodon (CM 85804). A) Bacterial microcolonies; note their high density in cementum (right). B) Bacterial colony in cementum passing into enamel (top
Image
Figure6—HDR images of fossil lagomorph teeth showing the distribution of Phase I and Phase II wear. The buccal surface is to the top and the mesial surface is to the left. The scale is 1.0 mm. 1, a left M2 of Megalagus brachyodon (P2113.142) showing the presence of a distinct shearing facet on the mesial side of the occlusal surface and the lack of Phase II wear. The image shows the shearing facet on the left side; 2, a left M1 of Palaeolagus temnodon (P2113.111) showing the lack of a distinct shearing facet on the mesial side of the occlusal surface and the lack of Phase II wear. The drawing shows the lack of shearing facet.

Figure 6 —HDR images of fossil lagomorph teeth showing the distribution of...

Published: 01 July 2010
Figure 6 —HDR images of fossil lagomorph teeth showing the distribution of Phase I and Phase II wear. The buccal surface is to the top and the mesial surface is to the left. The scale is 1.0 mm. 1 , a left M2 of Megalagus brachyodon (P2113.142) showing the presence of a distinct shearing facet
Journal Article

EARLIEST RECORD OF DENTAL PATHOGEN DISCOVERED IN A NORTH AMERICAN EOCENE RABBIT

ŁUCJA FOSTOWICZ-FRELIK, GRZEGORZ J. FRELIK
Journal: PALAIOS
Published: 01 December 2010
PALAIOS (2010) 25 (12): 818–822.
DOI: https://doi.org/10.2110/palo.2010.p10-084r
...Figure 4. Right lower molar (m2) of Megalagus brachyodon , CM 8620. A) Buccal view. B) Lingual view. C) Labial view. D) Occlusal view. E) Distal view. The asymmetrical enamel and the hiatus at the anterior wall of trigonid is typical of the lagomorphs with unilateral hypsodonty. Note separated...
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View PDF for article title, EARLIEST RECORD OF DENTAL PATHOGEN DISCOVERED IN A NORTH AMERICAN EOCENE RABBIT
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Journal Article

A new insect and plant Lagerstätte from a Tertiary lake deposit along the Canyon Ferry Reservoir, southwestern Montana

Emily A. CoBabe, Kevin R. Chamberlain, Michael A. Ivie, J. Joseph Giersch
Published: 01 January 2002
Rocky Mountain Geology (2002) 37 (1): 13–30.
DOI: https://doi.org/10.2113/gsrocky.37.1.13
... of Chadronian taxa, including some that are considered by Emry et al. (1987) to be index fossils for the age ( Titanotheriomys veterior Matthew, Paleolagus temnodon Douglass, and Megalagus brachyodon (Matthew) and some taxa generally restricted to the Chadron (“ Ictops ” acutidens Douglass...
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Book Chapter

The Chadronian mammalian fauna of the Florissant Formation, Florissant Fossil Beds National Monument, Colorado

Author(s)
Karen J. Lloyd, Marie P. Worley-Georg, Jaelyn J. Eberle
Book: Paleontology of the Upper Eocene Florissant Formation, Colorado
Publisher: Geological Society of America
Published: 01 January 2008
DOI: 10.1130/2008.2435(08)
... to differentiate species of Palaeolagus are present in the lower third premolar ( Dawson, 1958 ), which is not present in the specimen described here. As such, FLFO 5973 (UCM 99576) cannot be assigned to a species. FLFO 5973 (UCM 99576) is ∼40% smaller than Megalagus brachyodon ( Wood, 1940 ), also known from...
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Abstract
View PDF for content titled, The Chadronian mammalian fauna of the Florissant Formation, Florissant Fossil Beds National Monument, Colorado
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During the past five years, renewed prospecting and collecting of mammalian fossils in the Florissant Formation within Florissant Fossil Beds National Monument in central Colorado has nearly tripled the known diversity of fossil mammals from this rock unit. Taxa first recorded here from the Florissant Formation include the eomyid rodent Paradjidaumo trilophus , the lagomorph Palaeolagus , and the rare artiodactyl Pseudoprotoceras longinaris . We also describe an isolated deciduous premolar of a protoceratid. We update the mammalian faunal list of the Florissant Formation, which includes some 16 species in 13 families and 6 orders. The mammalian fauna corroborates the Chadronian (latest Eocene) age determined by others. Geographic ranges of Pelycomys , Palaeolagus , and Paradjidaumo trilophus are extended slightly southwest from northeastern Colorado, and the range of Pseudoprotoceras longinaris is extended southwest from Wyoming and Nebraska. Based upon comparison with nearest living relatives and plausible analogs, the mammalian taxa represented in the Florissant Formation seem to be consistent with the moist, warm temperate, relatively high elevation wetland and woodland habitats that have been inferred by others for the area in and around late Eocene Lake Florissant.