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112 results for “eutherian mammals”
FIGURE 10. RAM 10292 in New records of eutherian mammals from the Goler Formation (Tiffanian, Paleocene) of California and their biostratigraphic and paleobiogeographic implications
FIGURE 10. RAM 10292, left and partial right dentaries of Phenacodus cf. P. bisonensis from RAM locality V200802: A. occlusal view of left dentary with c–m3; B. labial view of RAM 10292; C. occlusal view of right dentary with i1-2, and c–m1.
Fig. 1. A in A eutherian mammal in the latest Cretaceous of Vitrolles, southern France
Fig. 1. A. Location of the Vitrolles la Plaine site (Arc Basin, Bouches−du−Rhône, southern France). B. Stratigraphic section through the fossiliferous layers.
Fig. 4 in A eutherian mammal in the latest Cretaceous of Vitrolles, southern France
Fig. 4. Enamel microstructure of Valentinella vitrollense gen. et sp. nov. (SEM micrographs). A. The p4 or dp4 of the holotype, ISEM/VLP−2; A1, vertical plane section showing outer prismless enamel and inner radial enamel; A2, detail of A1 in the radial enamel; IPM is badly preserved in this section. B. Rather vertical plane section through?p4, ISEM/VLP−4; IPM is better preserved and clearly appears not parallel to the prisms. The cristallites of the IPM are at angle with prisms long axes (40–45°). C. the m1, ISEM/VLP−2; C1, horizontal plane section, note the large diameter of prisms in this view (see text). Prisms are numerous and well packed with irregular arrangement; their cross−section vary from hexagonal to rounded aspect. The hole in center of prisms could correspond to the vanishing of Tomes' process according to Sanhi and Koenigswald (1997); C2, detail of C1, in this area the prisms show a clear rounded cross−section.
Data from: The evolution of gestation length in eutherian mammals
Open the record for dataset details and reuse information.
Fig. 38 in New Data On The Skull And Dentition In The Mongolian Late Cretaceous Eutherian Mammal Zalambdalestes
Fig. 38. Stereophotograph of the skull of Zalambdalestes lechei PSSMAE 135 in ventral view.
Fig. 12 in New Data On The Skull And Dentition In The Mongolian Late Cretaceous Eutherian Mammal Zalambdalestes
Fig. 12. Stereophotographs of the lower jaws of Zalambdalestes lechei AMNH 21708 in occlusal view.
Fig. 8 in New Data On The Skull And Dentition In The Mongolian Late Cretaceous Eutherian Mammal Zalambdalestes
Fig. 8. Stereophotographs of the upper dentition of Zalambdalestes lechei PSSMAE 130 in ventral
Fig. 25 in New Data On The Skull And Dentition In The Mongolian Late Cretaceous Eutherian Mammal Zalambdalestes
Fig. 25. Stereophotograph of the skull of Zalambdalestes lechei PSSMAE 108 in right lateral view.
Figure 8 in New eutherian mammals from the Late Cretaceous of Aix-en-Provence Basin, south-eastern France
Figure 8. Mistralestes arcensis gen. et sp. nov. from La Cairanne Highway, holotype MHNAix-PV.2008.1.1, right dentary fragment with p5 to m3 and roots of p4. A, lingual; B, labial; C, occlusal (stereoscopic) views; mental foramina are highlighted by black dotted lines; D, p5; E, m1 in occlusal view.
Figure 7 in New eutherian mammals from the Late Cretaceous of Aix-en-Provence Basin, south-eastern France
Figure 7. Valentinella vitrollense from Vitrolles-La Plaine. UM-VLP-3, probable right?P3 or?P4; A, occlusal; B, labial stereoviews. UP-VLP-07-04, fragment of a left upper molar; C, occlusal; D, distal stereoviews. Yellow, white, and red dotted lines indicate, respectively, the broken parts of the crown, the slope of the protocone, and the lingual slope of the hypocone on the postcingulum.
Figure 3 in New eutherian mammals from the Late Cretaceous of Aix-en-Provence Basin, south-eastern France
Figure 3. Valentinella vitrollense from Vitrolles-La Plaine, UP-VLP-10-01, left dentary fragment with roots of m1−m3. A, occlusal; B, labial views. Note the posteriorly inclined distal root of m3, mesially indented by a thin bony lamina.
Figure 2 in New eutherian mammals from the Late Cretaceous of Aix-en-Provence Basin, south-eastern France
Figure 2. Lithological logs and biochronological/magnetostratigraphical correlations of the Vitrolles-La Plaine and La Cairanne Highway sections. MAAST., Maastrichtian.
Figure 4 in New eutherian mammals from the Late Cretaceous of Aix-en-Provence Basin, south-eastern France
Figure 4. Valentinella vitrollense from Vitrolles-La Plaine, holotype UM-VLP-2, right dentary with p4−m3. A, twodimensional virtual slice images acquired by X-ray computed microtomography (μCT); three-dimensional reconstruction using μCT scan images; B, labial; C, mesial views.
Figure 10 in New eutherian mammals from the Late Cretaceous of Aix-en-Provence Basin, south-eastern France
Figure 10. Mistralestes arcensis gen. et sp. nov. from La Cairanne Highway, reconstruction of the holotype MHNAix- PV.2008.1.1, using three-dimensional X-ray computed microtomography scan images, in occlusal view showing the main structures of the molars, notably the gradual compression of the trigonid from m1 to m3.
Figure 9 in New eutherian mammals from the Late Cretaceous of Aix-en-Provence Basin, south-eastern France
Figure 9. Mistralestes arcensis gen. et sp. nov. from La Cairanne Highway, reconstruction of the holotype MHNAix-PV.2008.1.1, using three-dimensional X-ray computed microtomography scan images. A, occlusal (stereoscopic); B, lingual; C, labial views; mental foramina are highlighted by black dotted lines and yellow circles.
Figure 6 in New eutherian mammals from the Late Cretaceous of Aix-en-Provence Basin, south-eastern France
Figure 6. Valentinella vitrollense from Vitrolles-La Plaine, holotype UM-VLP-2, occlusal stereoview of p4−m1.
Figure 5 in New eutherian mammals from the Late Cretaceous of Aix-en-Provence Basin, south-eastern France
Figure 5. Valentinella vitrollense from Vitrolles-La Plaine, holotype UM-VLP-2, right dentary with p4−m3. A, labial; B, occlusal views; C, interpretative drawing in occlusal view, salmon-coloured areas indicate preserved patches of enamel.
Figure 1 in New eutherian mammals from the Late Cretaceous of Aix-en-Provence Basin, south-eastern France
Figure 1. Geological map and location of the Late Cretaceous sites Vitrolles-La Plaine (VLP), Vitrolles Couperigne (VCO) and La Cairanne Highway (LCH) in the Aix-en-Provence Basin.
Data from: Mitochondrial genome fragmentation unites the parasitic lice of eutherian mammals
Organelle genome fragmentation has been found in a wide range of eukaryotic lineages; however, its use in phylogenetic reconstruction has not been demonstrated. We explored the use of mitochondrial (mt) genome fragmentation in resolving the controversial suborder-level phylogeny of parasitic lice (order Phthiraptera). There are ~5,000 species of parasitic lice in four suborders (Amblycera, Ischnocera, Rhyncophthirina and Anoplura), which infest mammals and birds. The phylogenetic relationships among these suborders are unresolved despite decades of studies. We sequenced the mt genomes of eight species of parasitic lice and compared them with 17 other species of parasitic lice sequenced previously. We found that the typical single-chromosome mt genome is retained in the lice of birds but fragmented into many minichromosomes in the lice of eutherian mammals. The shared derived feature of mt genome fragmentation unites the eutherian mammal lice of Ischnocera (family Trichodectidae) with Anoplura and Rhyncophthirina to the exclusion of the bird lice of Ischnocera (family Philopteridae). This novel clade is also supported by phylogenetic analysis of mt genome and cox1 gene sequences. Our results demonstrate, for the first time, that organelle genome fragmentation is informative for resolving controversial high-level phylogenies.
Data from: Completeness of the eutherian mammal fossil record and implications for reconstructing mammal evolution through the Cretaceous/Paleogene mass extinction
There is a well-established discrepancy between paleontological and molecular data regarding the timing of the origin and diversification of placental mammals. Molecular estimates place interordinal diversification dates in the Cretaceous, whilst no unambiguous crown placental fossils have been found prior to the end-Cretaceous mass extinction. Here, the completeness of the eutherian fossil record through geological time is evaluated in order to assess the suggestion that a poor fossil record is largely responsible for the difference in estimates of placental origins. The completeness of fossil specimens was measured using the Character Completeness Metric, a metric that quantifies the completeness of fossil taxa as the percentage of phylogenetic characters that are available to be scored for any given taxon. Our dataset was comprised of 33 published cladistic matrices representing 445 genera, of which 333 were coded at the species-level. There was no significant difference in eutherian completeness across the Cretaceous/Palaeogene boundary. This suggests that the lack of placental mammal fossils in the Cretaceous is not due to a poor fossil record, but more likely represents a genuine absence of placental mammals in the Cretaceous. This result supports the 'explosive model' of early placental evolution, whereby placental mammals originated around the time of the Cretaceous/Palaeogene boundary and diversified soon after the event. No correlation was found between the completeness pattern observed in this study and those of previous completeness studies on birds and sauropodomorph dinosaurs, suggesting that different factors affect the preservation of these groups. No correlations were found with various isotope proxy measures, but Akaike Information Criterion analysis found that eutherian Character Completeness Metric scores were best explained by models involving the marine carbonate strontium isotope ratios (87Sr/86Sr), suggesting that the tectonic activity might play a role in controlling the completeness of the eutherian fossil record.
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Allen Brain Atlas
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International Brain Laboratory public data
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OpenNeuro
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