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1,301 results for “Early Cretaceous”
Figure 10 in Anatomy of the basal titanosaur (Dinosauria, Sauropoda) Andesaurus delgadoi from the mid-Cretaceous (Albian-early Cenomanian) Río Limay Formation, Neuquén Province, Argentina: implications for titanosaur systematics
Figure 10. Andesaurus delgadoi. Photographs of metacarpals: right metacarpal I (Mc I) in (A) dorsal, (B) distal, and (C) ventral view; left metacarpal V (Mc V) in (D) dorsal, (E) ventral, and (F) proximal view. In each of the images in dorsal and ventral view, the proximal end of the metacarpal is at the bottom of the image. In the distal and proximal-end images, the dorsal surface is at the top of the image. Scale bar: 100 mm.
Figure 11 in Anatomy of the basal titanosaur (Dinosauria, Sauropoda) Andesaurus delgadoi from the mid-Cretaceous (Albian-early Cenomanian) Río Limay Formation, Neuquén Province, Argentina: implications for titanosaur systematics
Figure 11. Andesaurus delgadoi: photographs of left pubis and left ischium in lateral view. Scale bar: 400 mm.
Figure 8 in Anatomy of the basal titanosaur (Dinosauria, Sauropoda) Andesaurus delgadoi from the mid-Cretaceous (Albian-early Cenomanian) Río Limay Formation, Neuquén Province, Argentina: implications for titanosaur systematics
Figure 8. Andesaurus delgadoi. Photographs of chevrons: (A) chevron 1 (C1) in anterior and right lateral view; (B) chevron 2 (C2) in anterior and left lateral view; (C) chevron 3 (C3) in anterior and left lateral view; (D) chevron 4 (C4) in posterior and left lateral view. Scale bar: 200 mm.
Figure 7 in Anatomy of the basal titanosaur (Dinosauria, Sauropoda) Andesaurus delgadoi from the mid-Cretaceous (Albian-early Cenomanian) Río Limay Formation, Neuquén Province, Argentina: implications for titanosaur systematics
Figure 7. Andesaurus delgadoi. Photographs of middle-posterior caudal vertebrae: (A) Cd23 in left lateral view; (B) Cd24 in left lateral view; Cd25 in (C) anterior, (D) right lateral, and (E) posterior view. Scale bar: 100 mm.
Figure 6 in Anatomy of the basal titanosaur (Dinosauria, Sauropoda) Andesaurus delgadoi from the mid-Cretaceous (Albian-early Cenomanian) Río Limay Formation, Neuquén Province, Argentina: implications for titanosaur systematics
Figure 6. Andesaurus delgadoi. Photographs of anterior–middle caudal vertebrae: (A) Cd10 and Cd11 in left lateral view; (B) Cd12 in left lateral view; (C) Cd13 in left lateral view; (D) Cd15 in left lateral view; (E) Cd18 in left lateral view; (F) Cd19 in left lateral view; Cd20 in (G) anterior, (H) left lateral, and (I) posterior view. Abbreviations: cb, circular bulge; nc ridge, neurocentral ridge. Scale bar: 100 mm.
Figure 5 in Anatomy of the basal titanosaur (Dinosauria, Sauropoda) Andesaurus delgadoi from the mid-Cretaceous (Albian-early Cenomanian) Río Limay Formation, Neuquén Province, Argentina: implications for titanosaur systematics
Figure 5. Andesaurus delgadoi. Photographs of caudal vertebra 8 (Cd8) in (A) anterior, (B) dorsal, (C) posterior, (D) left lateral, and (E) right lateral view. Abbreviations: POSL, postspinal lamina; PRSL, prespinal lamina; SPOL, spinopostzygapophyseal lamina; SPRL, spinoprezygapophyseal lamina; VCON, ventral concavity; VLR, ventrolateral ridge. Scale bar: 100 mm.
Figure 3 in Anatomy of the basal titanosaur (Dinosauria, Sauropoda) Andesaurus delgadoi from the mid-Cretaceous (Albian-early Cenomanian) Río Limay Formation, Neuquén Province, Argentina: implications for titanosaur systematics
Figure 3. Andesaurus delgadoi. Photographs of first caudal vertebra (Cd1) in (A) anterior, (B) posterior, (C) left lateral, and (D) dorsal (anterior surface at top of image) view. Scale bar: 100 mm.
Figure 2 in Anatomy of the basal titanosaur (Dinosauria, Sauropoda) Andesaurus delgadoi from the mid-Cretaceous (Albian-early Cenomanian) Río Limay Formation, Neuquén Province, Argentina: implications for titanosaur systematics
Figure 2. Andesaurus delgadoi. Photographs of dorsal vertebrae (Dv2) in (A) anterior, (B) right lateral, and (C) posterior view; (D) Dv3–Dv4 in right lateral view. Note that (C) is from a slightly oblique view because the vertebra is still in its field jacket, and so cannot be examined fully perpendicularly. Abbreviations: AL, accessory lamina; CPOL, centropostzygapophyseal lamina; CPRL, centroprezygapophyseal lamina; HYP, hyposphene; LFOR, lateral foramen; LFOS, lateral fossa; PCDL, posterior centrodiapophyseal lamina; PCPL, posterior centroparapophyseal lamina; PODL, postzygodiapophyseal lamina; POSL, postspinal lamina; PPF, postparapophyseal fossa; PRDL, prezygodiapophyseal lamina; PRSL, prespinal lamina; SPDL, spinodiapophyseal lamina; SPOL, spinopostzygapophyseal lamina; SPRL, spinoprezygapophyseal lamina. Scale bar: 200 mm.
Figure 1 in Anatomy of the basal titanosaur (Dinosauria, Sauropoda) Andesaurus delgadoi from the mid-Cretaceous (Albian-early Cenomanian) Río Limay Formation, Neuquén Province, Argentina: implications for titanosaur systematics
Figure 1. Map showing the El Chocón locality where the holotype of Andesaurus delgadoi was discovered (marked with a star). Inset map A shows the position of Neuquén Province within Argentina, and map B shows Neuquén Province. The black box within map B represents the area displayed in the main map (figures modified from Calvo, 1999).
Figure 4 in Anatomy of the basal titanosaur (Dinosauria, Sauropoda) Andesaurus delgadoi from the mid-Cretaceous (Albian-early Cenomanian) Río Limay Formation, Neuquén Province, Argentina: implications for titanosaur systematics
Figure 4. Andesaurus delgadoi. Photographs of anterior caudal vertebrae: (A) Cd2 in right lateral view; Cd3 in (B) left lateral, (C) dorsal, (D) anterior, (E) posterior, and (F) ventral views; vf, vascular foramen. Scale bar: 100 mm.
Data from: Ontogeny in the steinmanellines (Bivalvia: Trigoniida): an intra- and interspecific appraisal using the Early Cretaceous faunas from the Neuquén Basin as a case study
<p>Despite the paleontological relevance and paleobiological interest of trigoniid bivalves, our knowledge of their ontogeny –an aspect of crucial evolutionary importance– remains limited. Here, we assess the intra- and interspecific ontogenetic variations exhibited by the genus Steinmanella Crickmay (Myophorellidae: Steinmanellinae) during the early Valanginian – late Hauterivian of Argentina, and explore some of their implications. The (ontogenetic) allometric trajectories of seven species recognized for this interval were estimated from longitudinal data using 3D geometric morphometrics, segmented regressions and model selection tools, and then compared using trajectory analysis and allometric spaces. Our results show that within-species shell shape variation describes biphasic ontogenetic trajectories, decoupled from ontogenetic changes shown by sculpture, and with a gradual decay in magnitude as ontogeny progresses. The mode of change characterizing each phase (crescentic growth and anteroposterior elongation, respectively) is conserved across species, thus representing a feature of Steinmanella ontogeny; its evolutionary origin is inferred to be a consequence of the rate modification and allometric repatterning of the ancestral ontogeny. Among species, trajectories are more variable during early ontogenetic stages, becoming increasingly conservative at later stages. Trajectories' general orientation allows recognition of two stratigraphically-consecutive groups of species, hinting at a potentially higher genus-level diversity in the studied interval. In terms of functional morphology, juveniles had a morphology more suited for active burrowing than adults, whose features are associated with a sedentary lifestyle. The characteristic disparity of trigoniids could be related to the existence of an ontogenetic period of greater shell malleability betrayed by the presence of crescentic shape change.</p>
FIGURE 2 in Maastrichtian representatives of the dragonfly family Aeschnidiidae question the entomofaunal turnover of the early Late Cretaceous
FIGURE 2. Aeschnidiidae genus and species undetermined, specimen YPM IP 223901. A, Part, arrow: discoidal triangle. B, Counterpart. Scale bars = 10 mm.
FIGURE 3. A–B in Description of two new fossil echinoids (Echinodermata: Echinoidea) from the Early Hauterivian (Early Cretaceous) of the Paris Basin (France)
FIGURE 3. A–B, drawings of plate pattern in Salvaster roberti gen. et sp. nov., holotype, UBGD 277467; apical system (A) and plastron (B).
FIGURE 2. A-E in Description of two new fossil echinoids (Echinodermata: Echinoidea) from the Early Hauterivian (Early Cretaceous) of the Paris Basin (France)
FIGURE 2. A-E, Salvaster roberti gen. et sp. nov., holotype, UBGD 277467, Calcaires à Spatangues Fm, Saint-Sauveur; apical (A), lateral (B), oral (C), frontal (D) and posterior (E) views of test, x2.2. Scale bar: 10 mm.
FIGURE 6. A–C in Description of two new fossil echinoids (Echinodermata: Echinoidea) from the Early Hauterivian (Early Cretaceous) of the Paris Basin (France)
FIGURE 6. A–C, Stomechinus fallax (Agassiz, 1840), UBGD 277468, Auxerre, apical (A), oral (B) and lateral (C) views. D–F, Nucleolites salviensis (Cotteau, 1851), UBGD 277469, L'Orme du Pont, apical (D), oral (E) and lateral (F) views. G–I, Disaster subelongatus (d'Orbigny, 1853), UBGD 277470, Venoy, apical (G), oral (H) and lateral (I) views; x2. Scale bars: 10 mm.
FIGURE 1 in Description of two new fossil echinoids (Echinodermata: Echinoidea) from the Early Hauterivian (Early Cretaceous) of the Paris Basin (France)
FIGURE 1. Map showing the area of the Paris Basin (France) where the Calcaires à Spatangues Fm crops out, along with the limit of the Hauterivian transgression and main fault systems (modified after Courtinat et al. 2006). Distribution of main lithofacies as defined by Rat et al. (1987). Black stars show type localities where new taxa, Salvaster roberti gen. et sp. nov. (Les Rèbles) and Pygolampas edita gen. et sp. nov. (Narcy) were collected.
FIGURE 5. A–B in Description of two new fossil echinoids (Echinodermata: Echinoidea) from the Early Hauterivian (Early Cretaceous) of the Paris Basin (France)
FIGURE 5. A–B, drawings of apical plate pattern (A) and phyllopores of ambulacrum IV (B) in Pygolampas edita gen. et sp. nov., holotype, GR-PC.1709.
FIGURE 4. A–E in Description of two new fossil echinoids (Echinodermata: Echinoidea) from the Early Hauterivian (Early Cretaceous) of the Paris Basin (France)
FIGURE 4. A–E, Pygolampas edita gen. et sp. nov., holotype, GR-PC.1709, Calcaires à Spatangues Fm, Narcy; apical (A), lateral (B), oral (C), anterior (D) and posterior (E) views of test, x1.2; F, detail of apical system and petals in apical view, x1.7. Scale bars: 10 mm.
Fig. 10. 3D in The First Reconstruction of the Head Anatomy of a Cretaceous Insect, †Gerontoformica gracilis (Hymenoptera: Formicidae), and the Early Evolution of
Fig. 10. 3D reconstructions of the mandible of †Gerontoformica gracilis (A and D) and Formica rufa (B, C, and E) illustrating our two hypotheses for the evolution of the shovel-shaped mandible of crown ants.According to hypothesis 1 (A → B), the position of the subapical tooth (purple dot in A) is shifted posteriorly so that the margin between it and the apical tooth (cyan dot) is elongated and additional teeth are inserted. Elongation of the masticatory margin (cyan line) leads to the modified orientation of the basal margin (purple line).The original subapical tooth becomes the basal margin (purple dot in B). According to hypothesis 2 (A → C), basal broadening of the mandibular blade leads to the formation of the basal angle and part of the original basal margin is incorporated with the masticatory margin, developing denticles.The original subapical tooth (purple dot in A) remains the subapical tooth (purple dot in B).The position of the fimbriate line on the inner surface of the mandible (purple outline in D and E) supports hypothesis 2.
Fig. 9. 3D in The First Reconstruction of the Head Anatomy of a Cretaceous Insect, †Gerontoformica gracilis (Hymenoptera: Formicidae), and the Early Evolution of
Fig. 9. 3D reconstructions of the heads of †Gerontoformica gracilis (on the left) and crown Formicidae (on the right) illustrating character transitions at the root of crown Formicidae, i.e., excluding †Gerontoformica. The relevant characters and states are marked with cyan outlines for plesiomorphies and magenta outlines for apomorphies; where applicable, physical directions of state changes are marked by arrows of the same colors. Complete illustrations of character states in all investigated taxa can be found in the character list at the end of this contribution. Char. 7: Ventral view on the head of †G. gracilis and Brachyponera luteipes, showing a medium versus a long postgenal bridge.Char. 36: Dorsal view on the posterior portion of the head of †G. gracilis and Brachyponera luteipes, showing presence versus absence of ocelli. Char. 42: Ventral view on the head of †G. gracilis and Brachyponera luteipes, showing a rounded versus projecting hypostomal tooth. Char. 46: Frontal view of the oral foramen of †G. gracilis and Brachyponera luteipes, showing a hypostomal corner situated far lateral of the tip of the hypostomal process versus a hypostomal corner aligned with the tip of the hypostomal triangular process. Char. 78: Frontal view of the scapus of †G. gracilis and Formica rufa showing a short scapus relative to the flagellum versus a long one. Only part of the antennal flagellum is shown, as this is not entirely imaged in the used µCT-scan data. Char. 86: Lateral view of the mandibular articulation of †G. gracilis and F. rufa showing the atala either broadly and flatly bulging or narrowly and highly bulging.Char. 94 and 97: Dorsal view of the mandible of †G. gracilis and F. rufa showing a narrow mandibular blade and gnathal edge without denticles proximad the subapical tooth versus a basally broadened mandibular blade with basal angle and denticles developed on the gnathal edge. Char. 108: Frontal section through the M. craniomandibularis internus (0md1) of †G. gracilis and F. rufa showing all fibers directly attaching to the main apodeme (magenta) versus some fibers attaching on thin cuticular fibrillae (cyan). Char. 143: Dorsal view of the prepharynx digestive tract of †G. gracilis and Wasmannia showing one bundle of the lateral portion of M. pharyngoepipharyngalis (0pe1l) versus two bundles.
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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.
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
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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.