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94 results for “Yixian Formation”
Fig. 2 in Cranial anatomy of the iguanodontoid ornithopod Jinzhousaurus yangi from the Lower Cretaceous Yixian Formation of China
Fig. 2. Skull roof of the iguanodontoid ornithopod Jinzhousaurus yangi Wang and Xu, 2001a (IVPP V12691) from the lower Aptian (Lower Cretaceous) Dakangpu Member of the Yixian Formation of Baicaigou, Liaoning Province, People's Republic of China. Photograph (A) and interpretative drawing (B) of the skull in left lateral view.
Fig. 3 in Cranial anatomy of the iguanodontoid ornithopod Jinzhousaurus yangi from the Lower Cretaceous Yixian Formation of China
Fig. 3. Cranial elements of the iguanodontoid ornithopod Jinzhousaurus yangi Wang and Xu, 2001a (IVPP V12691) from the lower Aptian (Lower Cretaceous) Dakangpu Member of the Yixian Formation of Baicaigou, Liaoning Province, People's Republic of China. Right pterygoid in medial view (A), predentary and snout (B), and maxillary and dentary tooth rows (C) in labial view (rostral is to the left).
Fig. 1 in Cranial anatomy of the iguanodontoid ornithopod Jinzhousaurus yangi from the Lower Cretaceous Yixian Formation of China
Fig. 1. Holotype skull of the iguanodontoid ornithopod Jinzhousaurus yangi Wang and Xu, 2001a (IVPP V12691) from the lower Aptian (Lower Cretaceous) Dakangpu Member of the Yixian Formation of Baicaigou, Liaoning Province, People's Republic of China. Photograph (A) and interpretative drawing (B) of the skull in left lateral view.
FIGURE 3. Histological sections taken from Iteravis huchzermeyeri IVPP V18958 in Osteohistology of the Lower Cretaceous Yixian Formation ornithuromorph (Aves) Iteravis huchzermeyeri
FIGURE 3. Histological sections taken from Iteravis huchzermeyeri IVPP V18958: 1, ulna; 2, tibiotarsus; 3, close up of denoted area of the ulna; 4, close up of the contact with the endosteal layer under cross polarized light showing presence of lamellae; 5, close up of denoted area of the tibiotarsus; 6, close up of the tibiotarsus under cross polarized light showing the endosteal layer is parallel fibered. Abbreviations: c, simple canal; icl, inner circumferential layer; po, primary osteon.
FIGURE 1 in Osteohistology of the Lower Cretaceous Yixian Formation ornithuromorph (Aves) Iteravis huchzermeyeri
FIGURE 1. Simplified cladogram depicting relationships between specimens of Mesozoic birds that have been histologically sampled (modified from Zhou et al., 2014). Red indicates lineages in which rapid growth evolved; the dashed line for Confuciusornis is to indicate that although growing relatively faster than other basal birds, this taxon did not achieve growth rates comparable to derived members of the ornithuromorph lineage. Stages 1-5 (grey numbers) refer to important evolutionary transitions in basal bird bone microstructure: 1, bone shows increased vascularity and a primarily woven matrix but growth is non-continuous; 2, the Confuciusornis lineage evolves at least a period of postnatal growth in which fibro-lamellar bone is formed and growth lines are only found in the outermost cortex indicating these birds approached adult size within the first year; 3, at least one lineage of Late Cretaceous enantiornithines evolves a slow and protracted growth strategy; 4, fibro-lamellar bone matrix indicative of more rapid growth appears in ornithuromorphs but growth lines persist; 5, derived ornithuromorphs evolve uninterrupted growth. Abbreviations: FLB, fibro-lamellar bone; LAG, line of arrested growth; PFB, parallel fibered bone; WB, woven bone.
FIGURE 2 in Osteohistology of the Lower Cretaceous Yixian Formation ornithuromorph (Aves) Iteravis huchzermeyeri
FIGURE 2. Photograph of the holotype of Iteravis huchzermeyeri IVPP V18958 after sampling (indicated by white boxes); scale bar equals 2 centimeters.
Fig. 9 in Ordosemys (Testudines: Cryptodira) from the Yixian Formation of Liaoning Province, Northeastern China: New Specimens and Systematic Revision
Fig. 9. Ordosemys liaoxiensis (Ji, 1995), GM V3001, Yixian Formation, Liaoning, China. Detail of forelimb. Scale bar = 50 mm. Abbreviations: dc, distal central; int, intermedium; mc, metacarpal; med cent, medial central; p, phalanx; pis, pisiform; uln, ulnare.
Fig. 7 in Ordosemys (Testudines: Cryptodira) from the Yixian Formation of Liaoning Province, Northeastern China: New Specimens and Systematic Revision
Fig. 7. Ordosemys liaoxiensis (Ji, 1995), GM V3002, Yixian Formation, Liaoning, China. Shell in dorsal view. Scale bar = 50 mm.
Fig. 4 in Ordosemys (Testudines: Cryptodira) from the Yixian Formation of Liaoning Province, Northeastern China: New Specimens and Systematic Revision
Fig. 4. Ordosemys liaoxiensis (Ji, 1995), GM V30004, Yixian Formation, Liaoning, China. Skull in dorsal (A), ventral (B) and right lateral (C) views. Key for figure 3.
Fig. 6 in Ordosemys (Testudines: Cryptodira) from the Yixian Formation of Liaoning Province, Northeastern China: New Specimens and Systematic Revision
Fig. 6. Ordosemys liaoxiensis (Ji, 1995), GM V30001 and GM V30002, Yixian Formation, Liaoning, China. Shell in dorsal (A) and ventral (B) views. Key for figure 5.
Fig. 3 in Ordosemys (Testudines: Cryptodira) from the Yixian Formation of Liaoning Province, Northeastern China: New Specimens and Systematic Revision
Fig. 3. Ordosemys liaoxiensis (Ji, 1995), GM V30004, Yixian Formation, Liaoning, China. Skull in dorsal (A), ventral (B) and right lateral (C) views. Scale bar = 50 mm.
Fig. 1 in Ordosemys (Testudines: Cryptodira) from the Yixian Formation of Liaoning Province, Northeastern China: New Specimens and Systematic Revision
Fig. 1. Ordosemys liaoxiensis (Ji, 1995), GM V3001, Yixian Formation, Liaoning, China. Skeleton in ventral view. Scale bar = 50 mm.
Fig. 8 in Ordosemys (Testudines: Cryptodira) from the Yixian Formation of Liaoning Province, Northeastern China: New Specimens and Systematic Revision
Fig. 8. Ordosemys liaoxiensis (Ji, 1995), GM V3001, Yixian Formation, Liaoning, China. Detail of tail. Scale bar = 50 mm.
Fig. 5 in Ordosemys (Testudines: Cryptodira) from the Yixian Formation of Liaoning Province, Northeastern China: New Specimens and Systematic Revision
Fig. 5. Ordosemys liaoxiensis (Ji, 1995), GM V30001 and GM V30002, Yixian Formation, Liaoning, China. Shell in dorsal (A) and ventral (B) views. Scale bar = 50 mm.
Fig. 2 in Ordosemys (Testudines: Cryptodira) from the Yixian Formation of Liaoning Province, Northeastern China: New Specimens and Systematic Revision
Fig. 2. Ordosemys liaoxiensis (Ji, 1995), GM V3001, Yixian Formation, Liaoning, China. Skull in ventral view. Scale bar = 50 mm.
Data from: Ecological stasis in Spinicaudata (Crustacea, Branchiopoda)? Early Cretaceous clam shrimp of the Yixian Formation of north‐east China occupied a broader realized ecological niche than extant members of the group
The palaeoecology of Spinicaudata, the dominant group of benthic invertebrates in many pre-Cenozoic freshwater environments, remains poorly understood. In analogy with extant taxa, it has been oversimplified and often reduced to shallow, temporary environments characterised by few trophic levels, implying ecological stasis from the Devonian to the Recent. We excavated 43 horizons of the Lower Cretaceous Yixian Formation (Anjiagou and Hengdaozi beds) to evaluate whether spinicaudatan ecology can be simplified to such an extent. Sedimentological evidence suggests general perennial conditions during the excavated lake interval. Based on 33,226 specimen counts, we identified three arthropod-dominated macrobenthic associations and two assemblages. Response curves indicate that the spinicaudatan Eosestheria middendorfii was exceptionally tolerant to environmental gradients, followed, in decreasing order, by mayfly larvae, water boatmen and oligochaetes. Also, many spinicaudatan-yielding layers represent death after reproductive senescence rather than mass-mortality events. Spinicaudatan size varies significantly according to faunal association. A forward stepwise regression model suggests that growth responded to population density and diversity: lower densities and higher diversities triggered fast growth, and vice versa. The proposed strong density effect on carapace size has been corroborated by rearing experiments: As for E. middendorfii, natural log regression provided the best fit for the two extant species Eulimnadia texana and Eocyzicus argillaquus. Hence, Eosestheria middendorfii was a tolerant and morphologically variable species adapted to perennial waters and the frequent presence of higher trophic levels. Although there are rare records of extant taxa co-occurring with fish, the described Early Cretaceous environment is commonly not realized by extant Spinicaudata.
FIGURE 8. A in New genus and species of Hexagenitidae (Insecta: Ephemeroptera) from Yixian Formation, China
FIGURE 8. A, forewing of Ephemeropsis trisetalis Eichwald (after Tshernova and Sinitshenkova, 1974); B, hindwing of Ephemeropsis trisetalis Eichwald (after Tshernova, 1961); C, fore- and hind wings of Ephemeropsis trisetalis Eichwald (after Hong, 1982).
FIGURE 6 in New genus and species of Hexagenitidae (Insecta: Ephemeroptera) from Yixian Formation, China
FIGURE 6. Epicharmeropsis quadrivenulosus sp. nov., male imago, holotype, CNU-E-YX-2007002: A, photograph of head and thorax; B, photograph of cubital area on forewing. Without scale.
FIGURE 7 in New genus and species of Hexagenitidae (Insecta: Ephemeroptera) from Yixian Formation, China
FIGURE 7. Epicharmeropsis quadrivenulosus sp. nov., male imago, paratype, CNU-E-YX-2007014: A, photograph of part; B, body with wings.
FIGURE 4 in New genus and species of Hexagenitidae (Insecta: Ephemeroptera) from Yixian Formation, China
FIGURE 4. Epicharmeropsis hexavenulosus sp. nov., female imago, paratype CNU-E-YX-2007004: A, photograph of paratype; B, body with wings on lateral view; C, forewing.
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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.
Annotated Behaviour and Observability Dataset (ABODe)
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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.