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254 results for “Lower Jurassic”
Data from: The fossil insect assemblage associated with the Toarcian (Lower Jurassic) Oceanic Anoxic Event from Alderton Hill, Gloucestershire, UK
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Data from: The skull and endocranium of a Lower Jurassic ichthyosaur based on digital reconstructions
Even after 200 years of study, some details of the cranial anatomy of ichthyosaurs, one of the most successful groups of marine vertebrates in the Mesozoic, are still unclear. New information on the braincase, palate and occiput are provided from three-dimensional scans of an exceptionally preserved ichthyosaur ('Hauffiopteryx' typicus) skull from the Toarcian (183–174 Ma, Lower Jurassic) of Strawberry Bank, England. This ichthyosaur has unusual, hollow, tubular hyoid bars. The occipital and braincase region is fully reconstructed, creating the first digital cranial endocast of an ichthyosaur. Enlarged optic lobes and an enlarged cerebellum suggest neuroanatomical adaptations that allowed it to be a highly mobile, visual predator. The olfactory region also appears to be enlarged, suggesting that olfaction was more important for ichthyosaurs than has been assumed. Phylogenetic analysis suggests this ichthyosaur is closely related to, but distinct from, Hauffiopteryx, and positioned within Thunnosauria, a more derived position than previously recovered. These results further our knowledge of ichthyosaur cranial anatomy in three dimensions and provide a platform in which to study the anatomical adaptations that allowed ichthyosaurs to dominate the marine realm during the Mesozoic
Data from: The 'Last Hurrah of the Reigning Darwinulocopines'? Ostracoda (Arthropoda, Crustacea) from the Lower Jurassic Moenave Formation, Arizona and Utah, USA
An ostracod fauna is described from lacustrine sediments of the Hettangian, Lower Jurassic Whitmore Point Member of the Moenave Formation. The Moenave is well known for its rich, Late Triassic?–Early Jurassic fossil record, which includes fossil fishes, stromatolites, ostracods, spinicaudatans and a diverse ichnofauna of invertebrates and vertebrates. Four ostracod species, all belonging to the suborder Darwinulocopina, were recovered from these sediments: Suchonellina globosa, Suchonellina stricta, Whipplella? sp. 1 and Whipplella? sp. 2. The diversity and composition of the Whitmore Point Member ostracod fauna agree with previous interpretations about Lake Dixie and nearby paleoenvironments as shallow lakes, where darwinulocopine species which survived the effects of the Central Atlantic Magmatic Province and the subsequent End-Triassic extinction quickly recolonized these areas thanks to asexual reproduction by parthenogenesis. The Lake Dixie region, in its geographical isolation, may represent the last episode of darwinulocopine dominance in non-marine environments before the Late Jurassic diversification of the cypridocopine/cytherocopine modern ostracods.
Data from: Lower Jurassic foraminifera from the Llanbedr (Mochras Farm) Borehole, North Wales, UK
The complete, fully cored Lower Jurassic (Hettangian, Sinemurian, Pliensbachian, Toarcian) succession from the Llanbedr (Mochras Farm) Borehole, North Wales, the thickest known British section, has yielded a diverse and well preserved foraminiferal fauna, comprising 270 species and subspecies which are described and illustrated. An additional nine taxa, not encountered at Mochras, are also described. This typical European Boreal Atlantic foraminiferal fauna is dominated by members of the Lagenida, with the Ceratobuliminoidea, Miliolida, Spirillinina, Involutinina, Buliminida and Textulariida as important accessory groups. The Ceratobuliminoidea and Miliolida are unusually diverse, with Reinholdella and Ophthalmidium being notably abundant. The presence of the family Oberhauserellidae is significant. A benthonic foraminiferal biozonation scheme for the Lower Jurassic, comprising 16 biozones and tied to the standard ammonite-based chronostratigraphy, is described in detail. It is recognizable across the northern European Boreal province and as far south as Spain and France, and is applicable to subsurface hydrocarbon exploration of the UK continental shelf and onshore Europe. Three new genera (Duoplanum, Extonia and Haynesella) are described as well as 19 new species (Citharina sherringtoni, Duoplanum inaequale, D. leve, Glomospirella liassica, Lagena? haeusleri, L. semisulcata, Lagenammina pseudofusiformis, L. tangentia, Loxostomum liassicum, Marginulina turneri, Neobulimina bangae, Nodosaria pseudoclaviformis, Ophthalmidium strictum, Reinholdella? mochrasensis, R. robusta, Reussoolina? lacrimaforma, Semiiinvoluta excelsa, Tubinella pseudoinornata, and Vinelloidea lordi), and 10 new subspecies (Berthelinella involuta striata, Ichthyolaria terquemi barnardi, I. terquemi mediumcostata, Lenticulina varians barnardi, Loxostomum liassicum liassicum, L. liassicum teres, Ophthalmidium macfadyeni tenuiloculare, Paralingulina cernua ssp. A, Reinholdella margarita dorsoplana, and R. pachyderma humilis). Two further species are renamed as Nodosaria whittakeri and Paralingulina paranodosaria .
Data from: A lower jaw of Palaeoxonodon from the Middle Jurassic of the Isle of Skye, Scotland, sheds new light on the diversity of British stem therians
The Middle Jurassic was a key interval of mammalian evolutionary history that witnessed the diversification of the therian stem-group. Great Britain has yielded a significant record of mammalian fossils from this interval, represented by numerous isolated jaws and teeth from the Bathonian of Oxfordshire and the Isle of Skye. This record captures a key period in early cladotherian evolution, with amphitheriids, peramurans and "stem zatherians" displaying intermediate talonid morphologies that document the evolutionary assembly of tribosphenic molars. We present a mandible with near-complete dentition from the late Bathonian (ca. 167.4–166.5 Ma) Kilmaluag Formation, near Elgol, Skye, representing the amphitheriid Palaeoxonodon ooliticus, previously known only from isolated teeth. The specimen sheds new light on the taxonomic diversity of British Middle Jurassic stem therians, as the morphological variation within the preserved tooth row encompasses that previously ascribed to three distinct species within two genera: Palaeoxonodon ooliticus, P. freemani, and Kennetheridium leesi. Thus, both P. freemani and Kennetheridium leesi are subjective junior synonyms of P. ooliticus. The dental formula of P. ooliticus (i4:c1:p5:m5) is intermediate between the primitively larger postcanine count (p5:m6-7) of Amphitherium and the reduced number in peramurans and tribosphenidans (p5:m3). Phylogenetic analyses of P. ooliticus generally confirm a close affinity with Amphitherium, but highlight the lack of strong empirical support for hypothesized patterns of divergences among early cladotherians.
FIGURE 5 in Discovery of the most ancient member of family Tanyderidae (Diptera) from the Lower Jurassic (Sinemurian) of England
FIGURE 5. Reconstruction of the wing venation of Nannotanyderus oliviae sp. nov.; paratype (Lower Jurassic, Sinemurian). Scale 0.5 mm.
FIGURE 3 in Discovery of the most ancient member of family Tanyderidae (Diptera) from the Lower Jurassic (Sinemurian) of England
FIGURE 3. Photography of the wing venation of Nannotanyderus oliviae sp. nov.; paratype Scales 0.5 mm.
FIGURE 4 in Discovery of the most ancient member of family Tanyderidae (Diptera) from the Lower Jurassic (Sinemurian) of England
FIGURE 4. Reconstruction of the wing venation of Nannotanyderus oliviae sp. nov.; holotype (Lower Jurassic, Sinemurian). Scale 0.5 mm.
FIGURE 1 in Discovery of the most ancient member of family Tanyderidae (Diptera) from the Lower Jurassic (Sinemurian) of England
FIGURE 1. Wing venation of Nannotanyderus krzeminskii, holotype; (Toarcian of Grimmen); scale 0.5 mm.
FIGURE 2 in Discovery of the most ancient member of family Tanyderidae (Diptera) from the Lower Jurassic (Sinemurian) of England
FIGURE 2. Photography of the wing venation of Nannotanyderus oliviae sp. nov.; holotype (Lower Jurassic, Sinemurian). Scales 0.5 mm.
FIGURE 2. Seppo koponeni n. gen. & n in The first fossil spider (Araneae: Palpimanoidea) from the Lower Jurassic (Grimmen, Germany)
FIGURE 2. Seppo koponeni n. gen. & n. sp. Holotype and only known specimen MB.A 2966. Explanatory drawing to accompany Figure 1. Scale bar = 1 mm.
FIGURE 1. Seppo koponeni n. gen. & n in The first fossil spider (Araneae: Palpimanoidea) from the Lower Jurassic (Grimmen, Germany)
FIGURE 1. Seppo koponeni n. gen. & n. sp. Holotype and only known specimen MB.A 2966. A, photograph of dry specimen in low-angle light, ventral. B, photograph under 70% ethanol and cross-polarized light. Scale bars = 1 mm.
FIGURE 3. Seppo koponeni n. gen. & n in The first fossil spider (Araneae: Palpimanoidea) from the Lower Jurassic (Grimmen, Germany)
FIGURE 3. Seppo koponeni n. gen. & n. sp. Holotype and only known specimen MB.A 2966. A, cheliceral furrow showing base of fang and row of?promarginal peg teeth. B, distal end of metatarsus I, retrolateral, showing bristle-like macrosetae and trichobothrium, and pedipalp tarsus showing toothed terminal claw. C, metatarsus of right leg IV, prolateral, showing rows of bristles and distal pair of curved bristles. All photographs taken under 70% ethanol and in cross-polarized light.
FIGURE 11. S. magnicornia n. g. n in A new genus and species of Chresmodidae (Insecta: Gryllones) from Upper Jurassic-Lower Cretaceous of Yixian Formation, Inner Mongolia, China
FIGURE 11. S. magnicornia n. g. n. sp., photograph of paratype specimen: A, male, CNU-CH-NN2007002-1; B, male, CNU-CH-NN2007002-2; C, CNU-CH-NN2007003; scale 10mm.
FIGURE 9. S. magnicornia n. g. n in A new genus and species of Chresmodidae (Insecta: Gryllones) from Upper Jurassic-Lower Cretaceous of Yixian Formation, Inner Mongolia, China
FIGURE 9. S. magnicornia n. g. n. sp., A, holotype, female CNU-CH-NN2007004-1, photograph left tarsus of fore leg; B, paratype, male CNU-CH-NN2007003, photograph left tarsus of mid leg; scale 1mm.
FIGURE 8. S. magnicornia n. g. n in A new genus and species of Chresmodidae (Insecta: Gryllones) from Upper Jurassic-Lower Cretaceous of Yixian Formation, Inner Mongolia, China
FIGURE 8. S. magnicornia n. g. n. sp., paratype, female, nymph, CNU-CH-NN2007006: A, photograph of general habitus, scale 10mm; B, line drawing of antenna, scale 3mm; C, photograph of antenna, scale 3mm; D, photograph of wing buds, scale 3mm; E, photograph of ovipositor, scale 3mm.
FIGURE 7. S. magnicornia n. g. n in A new genus and species of Chresmodidae (Insecta: Gryllones) from Upper Jurassic-Lower Cretaceous of Yixian Formation, Inner Mongolia, China
FIGURE 7. S. magnicornia n. g. n. sp., paratype, male CNU-CH-NN2007001-1: A, photograph of genitalia; B, line drawing of genitalia; scale 2mm.
FIGURE 4. S. magnicornia n. g. n in A new genus and species of Chresmodidae (Insecta: Gryllones) from Upper Jurassic-Lower Cretaceous of Yixian Formation, Inner Mongolia, China
FIGURE 4. S. magnicornia n. g. n. sp., holotype, female, CNU-CH-NN2007004-2: A, photograph of ovipositor; B, line drawing of ovipositor; scale 2mm.
FIGURE 5. S. magnicornia n. g. n in A new genus and species of Chresmodidae (Insecta: Gryllones) from Upper Jurassic-Lower Cretaceous of Yixian Formation, Inner Mongolia, China
FIGURE 5. S. magnicornia n. g. n. sp., paratype, male: A, photograph of CNU-CH-NN2007001-1; B, line drawing of CNU-CH-NN2007001-1; C, photograph of CNU-CH-NN2007001-2; D, line drawing of CNU-CH-NN2007001-2; scale 10mm.
FIGURE 1. S. magnicornia n. g. n in A new genus and species of Chresmodidae (Insecta: Gryllones) from Upper Jurassic-Lower Cretaceous of Yixian Formation, Inner Mongolia, China
FIGURE 1. S. magnicornia n. g. n. sp., holotype, female: A, photograph of CNU-CH-NN2007004-1; B, photograph of CNU-CH-NN2007004-2; C, line drawing of CNU-CH-NN2007004-1; D, line drawing of CNU-CH-NN2007004-2; scale 10mm.
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Allen Brain Atlas
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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
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.