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47 results for “snake head”
FIGURE 7 in A new species of turtle-headed sea Snake (Emydocephalus: Elapidae) endemic to Western Australia
FIGURE 7. Emydocephalus species in life: Emydocephalus orarius sp. nov from Pilbara (A) and Shark Bay (B) (DPIRD), Emydocephalus annulatus from the Timor Sea (C) (Jenna Crowe-Riddell) and Emydocephalus ijimae from Okinawa (D) (Vladimir Dinets).
Data from: The causes and ecological correlates of head scale asymmetry and fragmentation in a tropical snake
The challenge of identifying the proximate causes and ecological consequences of phenotypic variation can be facilitated by studying traits that are usually but not always bilaterally symmetrical; deviations from symmetry likely reflect disrupted embryogenesis. Based on a 19-year mark-recapture study of >1300 slatey-grey snakes (Stegonotus cucullatus) in tropical Australia, and incubation of >700 eggs, we document developmental and ecological correlates of two morphological traits: asymmetry and fragmentation of head scales. Asymmetry was directional (more scales on the left side) and was higher in individuals with lower heterozygosity, but was not heritable. In contrast, fragmentation was heritable and was higher in females than males. Both scale asymmetry and fragmentation were increased by rapid embryogenesis but were not affected by hydric conditions during incubation. Snakes with asymmetry and fragmentation exhibited slightly lower survival and increased (sex-specific) movements, and females with more scale fragmentation produced smaller eggs. Counterintuitively, snakes with more asymmetry had higher growth rates (possibly reflecting trade-offs with other traits), and snakes with more fragmentation had fewer parasites (possibly due to lower feeding rates). Our data paint an unusually detailed picture of the complex genetic and environmental factors that, by disrupting early embryonic development, generate variations in morphology that have detectable correlations with ecological performance.
ASU Snake skin boots with snake head (3D Scan)
Snake skin boots with snake heads, white quarry stone, 21st century, northern mexico, 2011. Hand Carved White Quarry Stone. 74.8 on. x 35 on. x 71 in. Courtesy of he Eduardo Sarabia and Provectos Monclove, Mexico City Source: Objaverse 1.0 / Sketchfab
Data from: The causes and ecological correlates of head scale asymmetry and fragmentation in a tropical snake
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- *4K* Video - Painted Bronzeback Snake (Dendrelaphis pictus) High Definition head and brain 3D rendering
<p>4K movie displaying the 3D rendering of the head and both the morphological features and spatial organization of the major brain subdivisions of the Painted Bronzeback Snake. The brain reconstruction was obtained from a microCT scan of a iodine-stained specimen through manual segmentation using the software Amira 5.5.0.</p> <p>Other videos can be found <strong><a href="https://zenodo.org/search?page=1&size=20&q=keywords:%22squamate%20brain%22">here</a></strong>.</p> <p><em>If you are interested in reptile brain evolution and behavior, please, have a look to our recent publication:</em></p> <p><a href="https://www.nature.com/articles/s41467-019-13405-w"><em><strong>"Comparative analysis of squamate brains unveils multi-level variation in cerebellar architecture associated with locomotor specialization"</strong></em></a></p> <p><strong>Simone Macrì, Yoland Savriama, Imran Khan & Nicolas Di-Poï</strong></p> <p><em>Nature Communications</em> <strong>10, </strong>5560 (2019)</p> <p> </p> <p>For any inquiries or additional information, please, refer to the contacts provided in the <strong><a href="https://www.nature.com/articles/s41467-019-13405-w">article</a></strong>.</p>
- *4K* Video - Yellow-Bellied Sea Snake (Hydrophis platurus) head and brain 3D rendering
<p>4K movie displaying the 3D rendering of the head and both the morphological features and spatial organization of the main encephalic subdivisions of the Yellow-Bellied Sea Snake. The brain reconstruction was obtained from a microCT scan of a iodine-stained specimen through manual segmentation using the software Amira 5.5.0.</p> <p>Other videos can be found <strong><a href="https://zenodo.org/search?page=1&size=20&q=keywords:%22squamate%20brain%22">here</a></strong>.</p> <p><em>If you are interested in reptile brain evolution and behavior, please, have a look to our recent publication:</em></p> <p><a href="https://www.nature.com/articles/s41467-019-13405-w"><em><strong>"Comparative analysis of squamate brains unveils multi-level variation in cerebellar architecture associated with locomotor specialization"</strong></em></a></p> <p><strong>Simone Macrì, Yoland Savriama, Imran Khan & Nicolas Di-Poï</strong></p> <p><em>Nature Communications</em> <strong>10, </strong>5560 (2019)</p> <p> </p> <p>For any inquiries or additional information, please, refer to the contacts provided in the <strong><a href="https://www.nature.com/articles/s41467-019-13405-w">article</a></strong>.</p>
Data from: Does aquatic foraging impact head shape evolution in snakes?
Evolutionary trajectories are often biased by developmental and historical factors. However, environmental factors can also impose constraints on the evolutionary trajectories of organisms leading to convergence of morphology in similar ecological contexts. The physical properties of water impose strong constraints on aquatic feeding animals by generating pressure waves that can alert prey and potentially push them away from the mouth. These hydrodynamic constraints have resulted in the independent evolution of suction feeding in most groups of secondarily aquatic tetrapods. Despite the fact that snakes cannot use suction they have invaded the aquatic milieu many times independently. Here we test whether the aquatic environment has constrained head shape evolution in snakes and whether shape converges on that predicted by biomechanical models. To do so, we used 3D geometric morphometrics and comparative, phylogenetically informed analyses on a large sample of aquatic snake species. Our results show that aquatic snakes partially conform to our predictions and have a narrower anterior part of the head and dorsally positioned eyes and nostrils. This morphology is observed irrespective of the phylogenetic relationships among species suggesting that the aquatic environment does indeed drive the evolution of head shape in snakes, thus biasing the evolutionary trajectory of this group of animals.
Figure 4 from: Nugroho A, Tamtomo DG, Indarto D, Cilmiaty R, Soetrisno (2024) The effect of L-Arginine from Giant Snake Head fish (Channa micropeltes) on neuroinflammation and neuron damage in traumatic brain injury in rats. Pharmacia 71: 1-9. https://doi.org/10.3897/pharmacia.71.e111239
Figure 4 Immunohistochemical staining of Caspase-3 400× microscope magnification. Picture of caspase 3 expression in the cerebral cortex area shows a picture of caspase 3 expression in the cytoplasm of neuron cells (yellow arrow). A. The normal control group showed a score of 0; B. The negative control group shows a score of 4; C. Group A shows a score of 3; D. Group B shows a score of 2; E. Group C shows a score of 1.
Figure 5 from: Nugroho A, Tamtomo DG, Indarto D, Cilmiaty R, Soetrisno (2024) The effect of L-Arginine from Giant Snake Head fish (Channa micropeltes) on neuroinflammation and neuron damage in traumatic brain injury in rats. Pharmacia 71: 1-9. https://doi.org/10.3897/pharmacia.71.e111239
Figure 5 Histopathological picture of brain tissue damage with HE staining, 400× microscope magnification. Description: Histopathological picture of the cerebral cortex area shows degeneration of neuron cells (yellow arrows). A. The normal control group shows a score of 0; B. The negative control group shows a score of 2; C. Group A shows a score of 2; D. Group B shows a score of 1; E. Group C shows a score of 1.
Figure 2 from: Nugroho A, Tamtomo DG, Indarto D, Cilmiaty R, Soetrisno (2024) The effect of L-Arginine from Giant Snake Head fish (Channa micropeltes) on neuroinflammation and neuron damage in traumatic brain injury in rats. Pharmacia 71: 1-9. https://doi.org/10.3897/pharmacia.71.e111239
Figure 2 TLR4 immunohistochemical staining with a microscope magnification of 400×. Description: TLR4 expression in the cerebral cortex area shows TLR4 expression in astrocytes (yellow arrows). A. Control group normally expressed 5%; B. Negative control group expressed 20%; C. Group A expressed 15%; D. Group B expressed 15%; E. Group C expressed 10%.
Figure 3 from: Nugroho A, Tamtomo DG, Indarto D, Cilmiaty R, Soetrisno (2024) The effect of L-Arginine from Giant Snake Head fish (Channa micropeltes) on neuroinflammation and neuron damage in traumatic brain injury in rats. Pharmacia 71: 1-9. https://doi.org/10.3897/pharmacia.71.e111239
Figure 3 TNF-α immunohistochemical staining with a microscope magnification of 400×. TNF-α expression in the cerebral cortex area shows TNF-α expression in astrocytes (yellow arrows). A. Control group normally expressed 5%; B. Negative control group expressed 15%; C. Group A was depressed 10%; D. Group B expressed 10%; E. Group C expressed 5%.
Fig. 3. A in Synonymised And Forgotten, The Bird'S Head Stout-Tailed Snakes, Calamophis Meyer (Squamata: Serpentes: Homalopsidae)
Fig. 3. A comparison of the three new species of Calamophis: A, Calamophis katesandersae; B, Calamophis ruuddelangi; C, Calamophis sharonbrooksae.
Figure 1 from: Torres-Carvajal O, Yanez M, Quirola D, Smith E, Almendáriz A (2012) A new species of blunt-headed vine snake (Colubridae, Imantodes) from the Chocó region of Ecuador. ZooKeys 244: 91-110. https://doi.org/10.3897/zookeys.244.3950
Figure 1 - Holotype of Imantodes chocoensis sp. n. in dorsal (left) and ventral (right) views. Photographs by OTC.
Figure 6 from: Torres-Carvajal O, Yanez M, Quirola D, Smith E, Almendáriz A (2012) A new species of blunt-headed vine snake (Colubridae, Imantodes) from the Chocó region of Ecuador. ZooKeys 244: 91-110. https://doi.org/10.3897/zookeys.244.3950
Figure 6 - Distribution of Imantodes chocoensis sp. n. (circles) and its sister species Imantodes lentiferus (squares) in Ecuador.
Figure 7 from: Torres-Carvajal O, Yanez M, Quirola D, Smith E, Almendáriz A (2012) A new species of blunt-headed vine snake (Colubridae, Imantodes) from the Chocó region of Ecuador. ZooKeys 244: 91-110. https://doi.org/10.3897/zookeys.244.3950
Figure 7 - Majority rule (50%) consensus tree of 18,000 trees obtained from a Bayesian analysis of two mitochondrial genes (cyt-b, ND4) and 29 specimens. Asterisks correspond to posterior probability values > 0.99. Voucher numbers followed by country of collection are indicated for each terminal. E: east of the Andes, W: west of the Andes.
Figure 3 from: Torres-Carvajal O, Yanez M, Quirola D, Smith E, Almendáriz A (2012) A new species of blunt-headed vine snake (Colubridae, Imantodes) from the Chocó region of Ecuador. ZooKeys 244: 91-110. https://doi.org/10.3897/zookeys.244.3950
Figure 3 - Body segments of species of Imantodes from Ecuador in dorsal (left) and lateral (right) views. A Imantodes chocoensis sp. n. (DHMECN 6753, paratype) B Imantodes lentiferus (DHMECN 8345) C Imantodes cenchoa (DHMECN 7826) D Imantodes inornatus (DHMECN 5661). Photographs by MYM.
Figure 2 from: Torres-Carvajal O, Yanez M, Quirola D, Smith E, Almendáriz A (2012) A new species of blunt-headed vine snake (Colubridae, Imantodes) from the Chocó region of Ecuador. ZooKeys 244: 91-110. https://doi.org/10.3897/zookeys.244.3950
Figure 2 - . Head of holotype of Imantodes chocoensis sp. n. in dorsal (top), lateral (middle) and ventral (bottom) views. Photographs by OTC.
Figure 5 from: Torres-Carvajal O, Yanez M, Quirola D, Smith E, Almendáriz A (2012) A new species of blunt-headed vine snake (Colubridae, Imantodes) from the Chocó region of Ecuador. ZooKeys 244: 91-110. https://doi.org/10.3897/zookeys.244.3950
Figure 5 - Paratypes of Imantodes chocoensis sp. n. UTA R-60205 (top), DHMECN 6753 (bottom). Photographs by ENS and MYM.
Figure 4 from: Torres-Carvajal O, Yanez M, Quirola D, Smith E, Almendáriz A (2012) A new species of blunt-headed vine snake (Colubridae, Imantodes) from the Chocó region of Ecuador. ZooKeys 244: 91-110. https://doi.org/10.3897/zookeys.244.3950
Figure 4 - Right hemipenis of Imantodes chocoensis sp. n. (DHMECN 6753, paratype) in sulcal (A), asulcal (B), and lateral (C) views D close-up of distal end showing spines interrupted by sulci. Photographs by MYM.
Data from: Novel vascular plexus in the head of a sea snake (Elapidae, Hydrophiinae) revealed by high-resolution computed tomography and histology
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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)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
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.