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127 results for “exceptional preservation”
Figure 9 in The exceptionally well-preserved Sauropleura scalaris (Nectridea: Urocordylidae) from the late Carboniferous of the Czech Republic: new information on ontogeny, lateral line and tail
Figure 9. Sauropleura scalaris (Frič, 1875), simplified reconstruction of the posterior region of the skull in dorsal view in the three individuals of different sizes (A–C), showing a varying degree of development of squamosal flanges (dark grey) and caudolateral cheek extensions. The skull reconstructions are based on specimens ÚGV PAL00158 (A), NMP M391 (B) and ZP M122 (C).
Figure 8 in The exceptionally well-preserved Sauropleura scalaris (Nectridea: Urocordylidae) from the late Carboniferous of the Czech Republic: new information on ontogeny, lateral line and tail
Figure 8. Sauropleura scalaris (Frič, 1875), reconstruction of the skull and mandible based on the specimen ÚGV PAL00158. A, skull from dorsal view. B, skull and mandible in lateral view. Scale bar: 3 mm.
Figure 7 in The exceptionally well-preserved Sauropleura scalaris (Nectridea: Urocordylidae) from the late Carboniferous of the Czech Republic: new information on ontogeny, lateral line and tail
Figure 7. Sauropleura scalaris (Frič, 1875), ÚGV PAL00158, micro-computed tomography of the ribs and right clavicle. A, B, anterior presacral rib in anterior (A) and posterior (B) view. C, D, mid-trunk presacral rib in anterior (C) and posterior (D) view. E, F, posterior presacral rib in anterior (E) and posterior (F) view. G, H, right clavicle in medial view (G) and the same clavicle in medial view, with outlines of the imprint of the lateral surface in dark grey (H). Scale bars: 1 mm.
Figure 6 in The exceptionally well-preserved Sauropleura scalaris (Nectridea: Urocordylidae) from the late Carboniferous of the Czech Republic: new information on ontogeny, lateral line and tail
Figure 6. Sauropleura scalaris Frič, 1875, ÚGV PAL00158, micro-computed tomography of the tail skeleton. A, caudal vertebrae 1–18 in right lateral view. B, detail of caudal vertebrae 9–14 in right lateral view. C, reconstruction of the anterior caudal vertebrae in articulation in less lateral view. D, caudal vertebrae 26–56 in right lateral view. Dashed line marks the broken bone. Scale bar: 4 mm in A, D; and 1 mm in B, C.
Figure 2 in The exceptionally well-preserved Sauropleura scalaris (Nectridea: Urocordylidae) from the late Carboniferous of the Czech Republic: new information on ontogeny, lateral line and tail
Figure 2. Sauropleura scalaris (Frič, 1875), ÚGV PAL00158, micro-computed tomography of the skull and partial right mandible. A, skull and mandible in dorsolateral view. B, the same skull and mandible in dorsolateral view in grey colours. Dashed line marks the broken bone. Scale bar: 3 mm.
Figure 1 in The exceptionally well-preserved Sauropleura scalaris (Nectridea: Urocordylidae) from the late Carboniferous of the Czech Republic: new information on ontogeny, lateral line and tail
Figure 1. Sauropleura scalaris (Frič, 1875), ÚGV PAL00158. A, the entire specimen as preserved. B, skull and right mandible in ventrolateral view. C, caudal vertebrae 4–18 in less lateral view. D, caudal vertebrae 26–36 in less lateral view. E, caudal vertebrae 37–50 in less lateral view. F, right clavicle in medial view. Scale bars: 20 mm in A; 3 mm in B–E; and 2 mm in F.
Figure 3 in The exceptionally well-preserved Sauropleura scalaris (Nectridea: Urocordylidae) from the late Carboniferous of the Czech Republic: new information on ontogeny, lateral line and tail
Figure 3. Sauropleura scalaris (Frič, 1875), ÚGV PAL00158, micro-computed tomography of the skull and partial right mandible. A, skull and mandible in ventrolateral view. B, the same skull and mandible in grey colours, with outlines of the bone imprints in dark grey. Dashed line marks the broken bone. Scale bar: 3 mm.
Figure 5. A–G in The exceptionally well-preserved Sauropleura scalaris (Nectridea: Urocordylidae) from the late Carboniferous of the Czech Republic: new information on ontogeny, lateral line and tail
Figure 5. A–G, Sauropleura scalaris (Frič, 1875), ÚGV PAL00158, dentary in labial view, showing the pits and grooves of the lateral line system. A, imprint of the labial surface of the dentary, showing the entire lateral line system. B–D, close-up images of the lateral line pits and grooves. E–G, electron microscope images of the three anterior-most pits in the dentary. H, I, specimens referred to S. scalaris, showing the lateral line system on the imprint of the labial surface of the dentary. H, NMP M860. I, NMP M394. Arrowheads mark the distinctive morphology of the lateral line system on the dentary: blue colour corresponds to round-ovate pits in the anterior portion of the bone, yellow colour represents slightly elongated groove in the dentary middle part, and red colour corresponds to elongated groove in the posterior portion of the dentary. Scale bar: 1 mm in A, H, I; 250 µm in B–D; and 50 µm in E–G.
Figure 4 in The exceptionally well-preserved Sauropleura scalaris (Nectridea: Urocordylidae) from the late Carboniferous of the Czech Republic: new information on ontogeny, lateral line and tail
Figure 4. Sauropleura scalaris (Frič, 1875), ÚGV PAL00158, detail of the skull table in ventrolateral view, showing the course of orbitotemporal and capsular ridges on the frontal, parietal and tabular. Scale bar: 2 mm.
Data from: Exceptional preservation and the fossil record of tetrapod integument
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Supporting CT Data for: Two exceptionally preserved juvenile specimens of Gorgosaurus libratus (Tyrannosauridae, Albertosaurinae) provide new insight into the timing of ontogenetic changes in tyrannosaurids
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Joermungandr bolti, an exceptionally preserved microsaur from Mazon Creek, Illinois, reveals patterns of integumentary evolution in Recumbirostra
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Exceptional preservation of comma shrimp from a mid-Cretaceous Lagerstätte of Colombia, and the origins of crown Cumacea
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Data from: An exceptionally preserved Late Devonian actinopterygian provides a new model for primitive cranial anatomy in ray-finned fishes
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Data from: Exceptional preservation requires fast biodegradation: thylacocephalan specimens from La Voulte‐sur‐Rhône (Callovian, Jurassic, France)
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Data from: A new ankylosaurine dinosaur from the Judith River Formation of Montana, USA, based on an exceptional skeleton with soft tissue preservation
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Data from: A new exceptionally preserved Cambrian priapulid from the Chengjiang Lagerstätte
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New exceptionally-preserved panarthropods from the Drumian Wheeler Konservat-Lagerstätte of the House Range of Utah
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Data from: An exceptionally preserved association of complete dinosaur skeletons reveals the oldest long-necked sauropodomorphs
The rise of sauropodomorphs is still poorly understood due to the scarcity of well-preserved fossils in early Norian rocks. Here, we present an association of complete and exceptionally well-preserved dinosaur skeletons that helps filling that gap. They represent a new species, which is recovered as member of a clade solely composed of Gondwanan Triassic taxa. The new species allows defining a set of anatomical changes that shaped sauropodomorph evolution along a period from 233–225 Ma, as recorded in the well dated Late Triassic beds of Brazil. In that time span, apart from achieving a more herbivorous diet, sauropodomorph dinosaurs increased their size in a ratio of 230% and their typical long neck was also established, becoming proportionally twice longer than those of basal taxa. Indeed, the new dinosaur is the oldest-known sauropodomorph with such an elongated neck, suggesting that the ability to feed on high vegetation was a key trait achieved along the early Norian. Finally, the clustered preservation mode of the skeletons represents the oldest evidence of gregarious behaviour among sauropodomorphs.
Data from: Does exceptional preservation distort our view of disparity in the fossil record?
How much of evolutionary history is lost because of the unevenness of the fossil record? Lagerstätten, sites of exceptional fossil preservation, provide remarkable, yet distorting insights into past life. When examining macroevolutionary trends in the fossil record, they can generate an uneven sampling signal for taxonomic diversity; by comparison, their effect on morphological variety (disparity) is poorly understood. We show here that lagerstätten impact the disparity of ichthyosaurs, Mesozoic marine reptiles, by preserving higher diversity and more complete specimens. Elsewhere in the fossil record, undersampled diversity and more fragmentary specimens produce spurious results. We identify a novel effect, that a taxon moves towards the centroid of a Generalised Euclidean dataset as its proportion of missing data increases. We term this effect 'centroid slippage', as a disparity-based analogue of phylogenetic stemward slippage. Our results suggest that uneven sampling presents profound issues for our view of disparity in the fossil record, but that this is also dependent on the methodology used, especially true with widely used Generalised Euclidean distances. Mitigation of missing cladistic data is possible by phylogenetic gap filling, and heterogeneous effects of lagerstätten on disparity may be accounted for by understanding the factors affecting their spatiotemporal distribution.
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International Brain Laboratory public data
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OpenNeuro
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