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216 results for “palaeontology”
Text-fig. 2. Skeletal scheme of a woolly mammoth (Abel 1925) with preserved bone material of the Ahlen specimen shaded. in Everything Is A Question Of Time - Age Of Important Quaternary Palaeontological Finds From Westphalia
Text-fig. 2. Skeletal scheme of a woolly mammoth (Abel 1925) with preserved bone material of the Ahlen specimen shaded.
Text-fig. 6. The skeletal remains of the European bison from Gladbeck as reconstruction and presentation in the anatomical position. GMM A5.K 517. in Everything Is A Question Of Time - Age Of Important Quaternary Palaeontological Finds From Westphalia
Text-fig. 6. The skeletal remains of the European bison from Gladbeck as reconstruction and presentation in the anatomical position. GMM A5.K 517.
Figure 9 in Functional morphology and light-gathering ability of podocopid ostracod eyes and the palaeontological implications
Figure 9. Character state distribution of podocopids on a phylogenetic tree proposed by Yamaguchi (2003). The families not shown in bold face were not examined in this study, and estimations of their eye types were mainly based on the figures and descriptions of the cuticular lens by Benson et al. (1961) and Van Morkhoven (1963).
Figure 7. A in Functional morphology and light-gathering ability of podocopid ostracod eyes and the palaeontological implications
Figure 7. A, measurements of the four types of podocopid species (LG1, LG2, MG, and HG) plotted on Figure 6. B, theoretical models of possible podocopid ostracod eyes accommodated in the morphospace.
Figure 4. The setting for the phototactic experiments. A in Functional morphology and light-gathering ability of podocopid ostracod eyes and the palaeontological implications
Figure 4. The setting for the phototactic experiments. A white fibre-optic illumination (150 W) from a halogen lamp was exposed to the podocopid ostracod at the distance of D and an angle of 45°.
Figure 3. A in Functional morphology and light-gathering ability of podocopid ostracod eyes and the palaeontological implications
Figure 3. A, cuticular lens–tapetum model: bold dots in the lens represent the centre of the arc described by the outer and inner surface of the lens; r1, the radius of curvature of the outer lens surface; r2, the radius of curvature of the inner surface; e1, the thickness of the lens; e2, the distance between the lens and the tapetum; d, the diameter of a spherical mirror. B, an example of the computer simulation of ray tracing: Lt, the sum of the total lengths of segments of rays passing through the rhabdom (shown by the grey segments); n, the total number of rays of incident light.
Figure 2 in Functional morphology and light-gathering ability of podocopid ostracod eyes and the palaeontological implications
Figure 2. Idealized cross-sections showing the two possible ultrastructures of the podocopid lateral ocellus viewed from the anterior side. A, the pigment cup connects with the cuticular lens by connective tissue. B, the pigment cup is buried in the calcified valve, and the lens cell is degenerate.
Figure 1. The podocopid ostracod Aurila kiritsubo Yajima, 1982 in Functional morphology and light-gathering ability of podocopid ostracod eyes and the palaeontological implications
Figure 1. The podocopid ostracod Aurila kiritsubo Yajima, 1982; the right valve with a close-up of the cuticular lens. Scale bar = 100 µm.
Figure 8 in Functional morphology and light-gathering ability of podocopid ostracod eyes and the palaeontological implications
Figure 8. The relationship between the total irradiance of the microhabitat (%) of each species (where the total irradiance at the sea surface is 100%) and the light-gathering ability of eyes (G).
Figure 11. A in Functional morphology and light-gathering ability of podocopid ostracod eyes and the palaeontological implications
Figure 11. A, the relationship between the relative valve thickness (Tv) and the relative thickness of the lens (E1): r, correlation coefficient; P, significance level of the correlation. B, plots of the standardized curvature of the outer lens surface (R1) against the relative height of the ridge (Hr).
Figure 5 in Functional morphology and light-gathering ability of podocopid ostracod eyes and the palaeontological implications
Figure 5. Nine selected three-dimensional contour diagrams showing the theoretical morphospace consisting of parameters R1, R2, and G. The z-axis represents the G value corresponding to each combination of R1 and R2, for E1 = 2.0, 1.0, and 0.05, and E2 = 0.3, 0.6, and 0.9. Selected theoretical models are given for the corresponding regions in the morphospace.
Palaeontological evidence for community-level decrease in mesopelagic fish size during Pleistocene climate warming in the eastern Mediterranean
<p><span>Mesopelagic fishes are an important element of marine food webs, a huge, still mostly untapped food resource, and great contributors to the biological carbon pump, whose future under climate change scenarios is unknown. The shrinking of commercial fishes within decades has been an alarming observation, but its causes remain contended. Here, we investigate the effect of warming climate on mesopelagic fish size in the eastern Mediterranean Sea during a glacial-interglacial-glacial transition of the Middle Pleistocene (marine isotope stages 20–18; 814–712 </span><span> </span><span>Kyr B.P.), which included a 4ºC increase of global seawater temperature. Our results based on fossil otoliths show that the median size of lanternfishes, one of the most abundant groups of mesopelagic fishes in fossil and modern assemblages, declined by ~35% with climate warming at the community level. However, individual mesopelagic species showed different and often opposing trends in size across the studied time interval, suggesting that climate warming in the interglacial resulted in an ecological shift toward increased relative abundance of smaller-sized mesopelagic fishes due to geographic and/or bathymetric distribution range shifts, and the size-dependent effects of warming. </span></p>
Fig. 1 in A reassessment of the Cretaceous amber deposits from France and their palaeontological significance
Fig. 1. Geographical location and age of the Cretaceous amber deposits of France. Squares correspond to localities previously studied but no longer available in 2005, circles mark the outcrops which are currently visible: (1) Ecommoy (Bezonnais); (2) Durtal; (3) Briollay; (4) Aix Island; (5, 6) Fouras Peninsula: (5) Enet Island, (6) Fouras/Bois-Vert; (7) Tonnay-Charente (Les Renardières); (8) Archingeay-Les Nouillers; (9) Cadeuil; (10) Champniers (La Buzinie); (11) St-Lon; (12) StCyprien; (13) Fourtou; (14) St-Marcel-de-Carreiret; (15) Piolenc; (16) Salignac; (17) Belcodène.
Fig. 2 in A reassessment of the Cretaceous amber deposits from France and their palaeontological significance
Fig. 2. Various arthropod inclusions in the Late Albian amber of SW France: (A) Chilopoda, MNHN Buz 1.8, La Buzinie; (B) Heteroptera Tingidae, MNHN Cdl 2.28, Cadeuil; (C) Heteroptera Schizopteridae, MNHN Buz 1.5, La Buzinie; (D) Hymenoptera Braconidae, Protorhyssalinae, MNHN Cdl 2.30, Cadeuil; (E) Diptera Limoniidae and Hemiptera Achilidae, MNHN Arc 186.2, Archingeay-Les Nouillers; (F) Diptera Ceratopogonidae, MNHN Cdl 2.1, Cadeuil. Scale bars = 1 mm.
Data from: Ppgm: an R package for integrating neontological, palaeontological, and climate data in a phylogenetic comparative framework
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Palaeontological evidence for community-level decrease in mesopelagic fish size during Pleistocene climate warming in the eastern Mediterranean
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Data from: Quantifying the dark data in museum fossil collections as palaeontology undergoes a second digital revolution
Large-scale analysis of the fossil record requires aggregation of palaeontological data from individual fossil localities. Prior to computers these synoptic datasets were compiled by hand, a laborious undertaking that took years of effort and forced palaeontologists to make difficult choices about what types of data to tabulate. The advent of desktop computers ushered in palaeontology's first digital revolution – online literature-based databases, such as the Paleobiology Database (PBDB). However, the published literature represents only a small proportion of the palaeontological data housed in museum collections. Although this issue has long been appreciated, the magnitude, and thus potential significance, of these so-called "dark data" has been difficult to determine. Here, in the early phases of a second digital revolution in palaeontology the digitization of museum collections – we provide an estimate of the magnitude of palaeontology's dark data. Digitization of our nine institutions' holdings of Cenozoic marine invertebrate collections from California, Oregon, and Washington in the United States reveals that they represent 23 times the number of unique localities than are currently available in the Paleobiology Database. These data, and the vast quantity of similarly untapped dark data in other museum collections, will when digitally mobilized enhance palaeontologists' ability to make inferences about the patterns and processes of past evolutionary and ecological changes.
Text-fig. 18. Stereo images of fossil marine gastropod steinkerns from White Patch Fossil Site 1. in Stratigraphy, Chronology And Palaeontology Of The Tertiary Rocks Of The Cheringoma Plateau, Mozambique
Text-fig. 18. Stereo images of fossil marine gastropod steinkerns from White Patch Fossil Site 1.
Text-fig. 4. The Ahlen mammoth in its new mount of 2016. GMM A5N.383 (photo: Oliver Kunze). in Everything Is A Question Of Time - Age Of Important Quaternary Palaeontological Finds From Westphalia
Text-fig. 4. The Ahlen mammoth in its new mount of 2016. GMM A5N.383 (photo: Oliver Kunze).
Text-fig. 5. Fragment of the musk-ox skull from Herne-Crange. GMM A5.53. Scale bar 5 cm. in Everything Is A Question Of Time - Age Of Important Quaternary Palaeontological Finds From Westphalia
Text-fig. 5. Fragment of the musk-ox skull from Herne-Crange. GMM A5.53. Scale bar 5 cm.
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Allen Brain Atlas
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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
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.