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369 results for “Cranial morphology”
FIG. 28. Hsiangolestes youngi, IVPP V7438, serial sections 234–257 in Cranial And Postcranial Morphology Of The Insectivoran-Grade Mammals Hsiangolestes And Naranius (Mammalia, Eutheria) With Analyses Of Their Phylogenetic Relationships
FIG. 28. Hsiangolestes youngi, IVPP V7438, serial sections 234–257 (from back forward).
FIG. 43. Hsiangolestes youngi, IVPP V5797 in Cranial And Postcranial Morphology Of The Insectivoran-Grade Mammals Hsiangolestes And Naranius (Mammalia, Eutheria) With Analyses Of Their Phylogenetic Relationships
FIG. 43. Hsiangolestes youngi, IVPP V5797, stereophotograph of right pes in palmar view.
FIG. 26. Hsiangolestes youngi, IVPP V7438, serial sections 283–331 in Cranial And Postcranial Morphology Of The Insectivoran-Grade Mammals Hsiangolestes And Naranius (Mammalia, Eutheria) With Analyses Of Their Phylogenetic Relationships
FIG. 26. Hsiangolestes youngi, IVPP V7438, serial sections 283–331 (from back forward).
FIG. 27. Hsiangolestes youngi, IVPP V7438, serial sections 260–278 in Cranial And Postcranial Morphology Of The Insectivoran-Grade Mammals Hsiangolestes And Naranius (Mammalia, Eutheria) With Analyses Of Their Phylogenetic Relationships
FIG. 27. Hsiangolestes youngi, IVPP V7438, serial sections 260–278 (from back forward).
FIG. 23. Hsiangolestes youngi skull, IVPP V5346 in Cranial And Postcranial Morphology Of The Insectivoran-Grade Mammals Hsiangolestes And Naranius (Mammalia, Eutheria) With Analyses Of Their Phylogenetic Relationships
FIG. 23. Hsiangolestes youngi skull, IVPP V5346, left lateral view
FIG. 11 in Cranial And Postcranial Morphology Of The Insectivoran-Grade Mammals Hsiangolestes And Naranius (Mammalia, Eutheria) With Analyses Of Their Phylogenetic Relationships
FIG. 11. Skull and lower jaw of Hsiangolestes youngi, IVPP V7454.
FIG. 22. Hsiangolestes youngi skull, IVPP V5797 in Cranial And Postcranial Morphology Of The Insectivoran-Grade Mammals Hsiangolestes And Naranius (Mammalia, Eutheria) With Analyses Of Their Phylogenetic Relationships
FIG. 22. Hsiangolestes youngi skull, IVPP V5797: A. dorsal and B. left lateral views.
FIG. 17. Hsiangolestes youngi lower jaw, IVPP V7435 in Cranial And Postcranial Morphology Of The Insectivoran-Grade Mammals Hsiangolestes And Naranius (Mammalia, Eutheria) With Analyses Of Their Phylogenetic Relationships
FIG. 17. Hsiangolestes youngi lower jaw, IVPP V7435: A. left lateral and B. right lateral views.
FIG. 19. Hsiangolestes youngi skull, IVPP V5797 in Cranial And Postcranial Morphology Of The Insectivoran-Grade Mammals Hsiangolestes And Naranius (Mammalia, Eutheria) With Analyses Of Their Phylogenetic Relationships
FIG. 19. Hsiangolestes youngi skull, IVPP V5797: A. ventral and B. right lateral views.
FIG. 14 in Cranial And Postcranial Morphology Of The Insectivoran-Grade Mammals Hsiangolestes And Naranius (Mammalia, Eutheria) With Analyses Of Their Phylogenetic Relationships
FIG. 14. Right maxilla of Hsiangolestes youngi, IVPP V5346, stereophotograph in occlusal view.
FIG. 17 in A sabre-tooth predator from the Neotropics: Cranial morphology of Anachlysictis gracilis Goin, 1997 (Metatheria, Thylacosmilidae), based on new specimens from La Venta (Middle Miocene, Colombia)
FIG. 17. — Reconstructed head of Anachlysictis gracilis Goin, 1997. Artist: Tatsuya Shinmura.
Cranial morphology of a new phytosaur (Diapsida, Archosauria) from the Upper Triassic of India: implications for phytosaur phylogeny and biostratigraphy
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Data from: The cranial morphology, phylogenetic position and biogeography of the upper Permian dicynodont Compsodon helmoedi van Hoepen (Therapsida, Anomodontia)
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Data from: Wolf cranial morphology tracks population replacement in Fennoscandia
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Data from: Evolutionary processes and its environmental correlates in the cranial morphology of western chipmunks (Tamias)
The importance of the environment in shaping phenotypic evolution lies at the core of evolutionary biology. Chipmunks of the genus Tamias (subgenus Neotamias) are part of a very recent radiation, occupying a wide range of environments with marked niche partitioning among species. One open question is if and how those differences in environments affected phenotypic evolution in this lineage. Herein we examine the relative importance of genetic drift versus natural selection in the origin of cranial diversity exhibited by clade members. We also explore the degree to which variation in potential selective agents (environmental variables) are correlated with the patterns of morphological variation presented. We found that genetic drift cannot explain morphological diversification in the group, thus supporting the potential role of natural selection as the predominant evolutionary force during Neotamias cranial diversification, although the strength of selection varied greatly among species. This morphological diversification, in turn, was correlated with environmental conditions, suggesting a possible causal relationship. These results underscore that extant Neotamias represent a radiation in which aspects of the environment might have acted as the selective force driving species' divergence.
Data from: Do convergent ecomorphs evolve through convergent morphological pathways? Cranial shape evolution in fossil hyaenids and borophagine canids (Carnivora, Mammalia)
Cases of convergent evolution, particularly within ecomorphological contexts, are instructive in identifying universally adaptive morphological features across clades. Tracing of evolutionary pathways by which ecomorphological convergence takes place can further reveal mechanisms of adaptation, which may be strongly influenced by phylogeny. Ecomorphologies of carnivorous mammals represent some of the most outstanding cases of convergent evolution in the Cenozoic radiation of mammals. This study examined patterns of cranial shape change in the dog (Canidae) and hyena (Hyaenidae) families, in order to compare the evolutionary pathways that led to the independent specialization of bone-cracking hypercarnivores within each clade. Geometric morphometrics analyses of cranial shape in fossil hyaenids and borophagine canids provided evidence for deep-time convergence in morphological pathways toward the independent evolution of derived bone-crackers. Both clades contained stem members with plesiomorphic generalist/omnivore cranial shapes, which evolved into doglike species along parallel pathways of shape change. The evolution of specialized bone-crackers from these doglike forms, however, continued under the constraint of a full cheek dentition and restriction on rostrum length reduction in canids, but not hyaenids. Functionally, phylogenetic constraint may have limited borophagine canids to crack bones principally with their carnassial instead of the third premolar as in hyaenids, but other cranial shape changes associated with durophagy nevertheless evolved in parallel in the two lineages. Size allometry was not a major factor in cranial shape evolution in either lineage, supporting the interpretation of functional demands as drivers for the observed convergence. The comparison between borophagines and hyaenids showed that differential effects of alternative functional "solutions" that arise during morphological evolution may be multiplied with processes of the "macroevolutionary ratchet" already in place to further limit the evolutionary pathways available to specialized lineages.
FIGURE 5 in Morphological distinction of species of Thrichomys (Rodentia: Echimyidae) through ontogeny of cranial and dental characters
FIGURE 5. The shapes of the hamular processes of: (A) Thrichomys laurentius, (B) T. pachyurus and (C) T. inermis. Scale bar is 1mm.
FIGURE 3 in Morphological distinction of species of Thrichomys (Rodentia: Echimyidae) through ontogeny of cranial and dental characters
FIGURE 3. Wear pattern of superior cheekteeth of Thrichomys inermis in sequence of age groups described from younger (A) to older (I). Scale bar is 1 mm.
FIGURE 1 in Morphological distinction of species of Thrichomys (Rodentia: Echimyidae) through ontogeny of cranial and dental characters
FIGURE 1. Wear pattern of superior cheekteeth of Thrichomys laurentius in the sequence of age groups described from younger (A) to older (I). Scale bar is 1mm.
FIGURE 2 in Morphological distinction of species of Thrichomys (Rodentia: Echimyidae) through ontogeny of cranial and dental characters
FIGURE 2. Wear pattern of superior cheekteeth of Thrichomys pachyurus in the sequence of age groups described from younger (A) to older (H). Scale bar is 1mm.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
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