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1,817 results for “Late Cretaceous”
Fig. 17 in Gladiopycnodontidae, a new family of pycnodontiform fishes from the Late Cretaceous of Lebanon, with the description of three genera
Fig. 17. Rostropycnodus gayeti gen. et sp. nov. Paratype CLC S-595.
Fig. 6 in Osteology and relationships of Rhinopycnodus gabriellae gen. et sp. nov. (Pycnodontiformes) from the marine Late Cretaceous of Lebanon
Fig. 6. Rhinopycnodus gabriellae gen. et sp. nov. Caudal region of holotype CLC S-725.
Fig. 2 in Osteology and relationships of Rhinopycnodus gabriellae gen. et sp. nov. (Pycnodontiformes) from the marine Late Cretaceous of Lebanon
Fig. 2. Rhinopycnodus gabriellae gen. et sp. nov. Reconstruction of holotype CLC S-725.
Fig. 1 in Osteology and relationships of Rhinopycnodus gabriellae gen. et sp. nov. (Pycnodontiformes) from the marine Late Cretaceous of Lebanon
Fig. 1. Rhinopycnodus gabriellae gen. et sp. nov. Holotype CLC S-725.
Fig. 20 in On the "Coccodus" lindstroemi species complex (Pycnodontiformes, Gladiopycnodontidae) from the marine Late Cretaceous of Lebanon, with the description of two new genera
Fig. 20. Pankowskichthys libanicus gen. et sp. nov. Caudal skeleton of holotype, IRSNB P 9278.
Fig. 17 in On the "Coccodus" lindstroemi species complex (Pycnodontiformes, Gladiopycnodontidae) from the marine Late Cretaceous of Lebanon, with the description of two new genera
Fig. 17. Pankowskichthys libanicus gen. et sp. nov. Holotype, IRSNB P 9278.
Fig. 12 in On the "Coccodus" lindstroemi species complex (Pycnodontiformes, Gladiopycnodontidae) from the marine Late Cretaceous of Lebanon, with the description of two new genera
Fig. 12. Joinvillichthys kriweti gen. et sp. nov. Holotype, CLC S-137.
Fig. 9 in On the "Coccodus" lindstroemi species complex (Pycnodontiformes, Gladiopycnodontidae) from the marine Late Cretaceous of Lebanon, with the description of two new genera
Fig. 9. Joinvillichthys lindstroemi (Davis, 1890). Caudal skeleton of sample IRSNB N° P 9276.
Fig. 2 in On the "Coccodus" lindstroemi species complex (Pycnodontiformes, Gladiopycnodontidae) from the marine Late Cretaceous of Lebanon, with the description of two new genera
Fig. 2. Joinvillichthys lindstroemi (Davis, 1890). Sample IRSNB N° P 9276.
Fig. 1 in On the "Coccodus" lindstroemi species complex (Pycnodontiformes, Gladiopycnodontidae) from the marine Late Cretaceous of Lebanon, with the description of two new genera
Fig. 1. Joinvillichthys lindstroemi (Davis, 1890). Holotype, NRM PZ P. 2073.
Fig. 7 in On the "Coccodus" lindstroemi species complex (Pycnodontiformes, Gladiopycnodontidae) from the marine Late Cretaceous of Lebanon, with the description of two new genera
Fig. 7. Joinvillichthys lindstroemi (Davis, 1890). Vomerian region of sample CLC S-138
Fig. 3 in On the "Coccodus" lindstroemi species complex (Pycnodontiformes, Gladiopycnodontidae) from the marine Late Cretaceous of Lebanon, with the description of two new genera
Fig. 3. Joinvillichthys lindstroemi (Davis, 1890). Sample CLC S-138.
Fig. 8 in On the "Coccodus" lindstroemi species complex (Pycnodontiformes, Gladiopycnodontidae) from the marine Late Cretaceous of Lebanon, with the description of two new genera
Fig. 8. Joinvillichthys lindstroemi (Davis, 1890). Orbital region of sample IRSNB N° P 9276.
Evolutionary stasis, ecophenotypy, and environmental controls on ammonite morphology in the Late Cretaceous (Maastrichtian) Western Interior Seaway, USA
<p class="Abstract">We test for the presence of evolutionary stasis in a species of Late Cretaceous ammonoid cephalopod, <i>Hoploscaphites nicolletii</i>, from the North American Western Interior Seaway. A comprehensive dataset of morphological traits was compiled across the entire spatial and temporal range of this species. These were analyzed in conjunction with sedimentologically and geochemically derived palaeoenvironmental conditions hypothesized to apply selective pressures. All changes in shell shape were observed to be ephemeral and reversable, that is, no unidirectional trend could be observed in any of the morphological traits analyzed. Correlations between palaeoenvironmental conditions and morphological traits suggests ecophenotypic processes were at play, however, either environmental changes were too minor and/or provided no isolating mechanism to drive speciation. These data support mechanisms of stasis such as homogenizing gene flow or stabilising selection under a fluctuating optimum (likely reflecting spatiotemporally heterogeneous palaeoenvironmental conditions). Finally, changes in shell size were not significantly associated with changes in shell-specific δ<sup>18</sup>O, despite a correlation between shell size and δ<sup>18</sup>O averaged across horizons. This suggests a mismatch in scales of geochemical sampling that supports caution when making broad interpretations based on averaged geochemical data.</p>
Data from: Late Cretaceous bird from Madagascar reveals unique development of beaks
<p>Mesozoic birds display considerable diversity in size, flight adaptations and feather organization, but exhibit relatively conserved patterns of beak shape and development. Although Neornithine (that is, crown group) birds also exhibit constraint on facial development, they have comparatively diverse beak morphologies associated with a range of feeding and behavioural ecologies, in contrast to Mesozoic birds. Here we describe a crow-sized stem bird, <em>Falcatakely forsterae </em>gen. et sp. nov., from the Late Cretaceous epoch of Madagascar that possesses a long and deep rostrum, an expression of beak morphology that was previously unknown among Mesozoic birds and is superficially similar to that of a variety of crown-group birds (for example, toucans). The rostrum of <em>Falcatakely </em>is composed of an expansive edentulous maxilla and a small tooth-bearing premaxilla. Morphometric analyses of individual bony elements and three-dimensional rostrum shape reveal the development of a neornithine-like facial anatomy despite the retention of a maxilla–premaxilla organization that is similar to that of nonavialan theropods. The patterning and increased height of the rostrum in <em>Falcatakely </em>reveals a degree of developmental lability and increased morphological disparity that was previously unknown in early branching avialans. Expression of this phenotype (and presumed ecology) in a stem bird underscores that consolidation to the neornithine-like, premaxilla-dominated rostrum was not an evolutionary prerequisite for beak enlargement.</p>
New application of strontium isotopes reveals evidence of limited migratory behaviour in Late Cretaceous hadrosaurs
<p>Dinosaur migration patterns are very difficult to determine, often relying solely on the geographic distribution of fossils. Unfortunately, it is generally not possible to determine if a fossil taxon's geographic distribution is the result of migration or simply a wide distribution. Whereas some attempts have been made to use isotopic systems to determine migratory patterns in dinosaurs, these methods have yet to achieve wider usage in the study of dinosaur ecology.</p> <p>Here we have used strontium isotope ratios from fossil enamel to reconstruct the movements of an individual hadrosaur from Dinosaur Provincial Park in Alberta, Canada. Results from this study are consistent with a range or migratory pattern between Dinosaur Provincial Park and a contemporaneous locality in the South Saskatchewan River area, Alberta Canada. This represents a minimum distance of approximately 80 km, which is consistent with migrations seen in modern elephants. These results suggest the continent-wide distribution of some hadrosaur species in the Late Cretaceous of North America is not the result of extremely long-range migratory behaviours.</p>
Fig. 14 in Morphology Of The Late Cretaceous Crocodylomorph Shamosuchus Djadochtaensis And A Discussion Of Neosuchian Phylogeny As Related To The Origin Of Eusuchia
Fig. 14. Detail of Shamosuchus djadochtaensis autapomorphic characteristic of a prominent depressed
Fig. 10 in Morphology Of The Late Cretaceous Crocodylomorph Shamosuchus Djadochtaensis And A Discussion Of Neosuchian Phylogeny As Related To The Origin Of Eusuchia
Fig. 10. Referred specimen of Shamosuchus djadochtaensis IGM 100/1195 in lateral view. See appendix
Fig. 9 in Morphology Of The Late Cretaceous Crocodylomorph Shamosuchus Djadochtaensis And A Discussion Of Neosuchian Phylogeny As Related To The Origin Of Eusuchia
Fig. 9. Referred specimen of Shamosuchus djadochtaensis IGM 100/1195 in ventral view. See appendix
Fig. 37 in Morphology Of The Late Cretaceous Crocodylomorph Shamosuchus Djadochtaensis And A Discussion Of Neosuchian Phylogeny As Related To The Origin Of Eusuchia
Fig. 37. Strict consensus of 18 most parsimonious trees obtained in the phylogenetic analysis.
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
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)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
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
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.