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6,771 results for “freshwater”
FIGURE 4 in On the rotifer fauna of Disko Island, Greenland, with notes on selected species from a stagnant freshwater lake
FIGURE 4. Resticula nyssa. SEMphotos of trophi. A: dorsal view. B: frontal view. mm – aperture of medial manubrium chamber; pr – pleural rod; ra – ramus.
FIGURE 1 in The freshwater ribbonworm Prostoma graecense (Hoplonemertea: Monostilifera) in South America (Argentina)
FIGURE 1. Prostoma graecense (Böhmig 1892) from Argentina. Sagittal section through the cephalic region showing the cupshaped frontal organ (FO).
FIGURE 2 in The freshwater ribbonworm Prostoma graecense (Hoplonemertea: Monostilifera) in South America (Argentina)
FIGURE 2. Prostoma graecense (Böhmig 1892) from Argentina. Sagittal section through the fore region of the body, showing the ciliated epithelium of the oesophagus (OE) and the extension of the cephalic glands (CG): dorsal cerebral commisure (DCC); PR, proboscis; RC, rhynchocoel; VCC, ventral cerebral commisure.
FIGURE 3 in Sexual dimorphism in a freshwater atyid shrimp (Decapoda: Caridea) with direct development: a geometric morphometrics approach
FIGURE 3. Relative deformations grids illustrating the variation in the mean shape of the carapace for (a) females and (b) males.
FIGURE 2 in Sexual dimorphism in a freshwater atyid shrimp (Decapoda: Caridea) with direct development: a geometric morphometrics approach
FIGURE 2. Scatter plot of first versus second principal component axes for the total variation of the carapace shape for females, juvenile females and males of Neocaridina davidi.
FIGURE 2 in A new family, genus and species of freshwater amphipod Australomicroprotopus megacoxa gen. nov. sp. nov. (Senticaudata, Corophiidea, Microprotopoidea, Australomicroprotopidae fam. nov.) from Australia
FIGURE 2. Australomicroprotopus megacoxa gen. nov. sp. nov., male paratype Victoria, Maribyrnong River.
FIGURE 1 in A new family, genus and species of freshwater amphipod Australomicroprotopus megacoxa gen. nov. sp. nov. (Senticaudata, Corophiidea, Microprotopoidea, Australomicroprotopidae fam. nov.) from Australia
FIGURE 1. Australomicroprotopus megacoxa gen. nov. sp. nov., male holotype, Victoria, Maribyrnong River.
FIGURE 3 in A new family, genus and species of freshwater amphipod Australomicroprotopus megacoxa gen. nov. sp. nov. (Senticaudata, Corophiidea, Microprotopoidea, Australomicroprotopidae fam. nov.) from Australia
FIGURE 3. Australomicroprotopus megacoxa gen. nov. sp. nov., male and female paratypes Victoria, Maribyrnong River.
FIGURE 13 in A new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the Rio Negro, Amazonas, Brazil: the smallest species of Potamotrygon
FIGURE 13. Alfred Russel Wallace's illustration of the new species, rendered between 1850 and 1852 (modified from Wallace, 2002). Original illustration about 12 cm long.
FIGURE 10 in A new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the Rio Negro, Amazonas, Brazil: the smallest species of Potamotrygon
FIGURE 10. Further details of the skeleton of Potamotrygon wallacei n. sp. (UFPB 5217, female, 236 mm DW). A) Neurocranium in dorsal view. B) Lateral view of left scapula. C) Pelvic girdle showing extent of median pre-pelvic process (UFPB 6100, male 174 mm DW). D) Gill arches in dorsal view, splayed to left (dorsal elements removed from right side). Abbreviations: adf, anterodorsal fenestra; afp, anterior foramen for preorbital canal; avf, anteroventral fenestra; bb, basibranchial copula; bh, basihyal; cb: ceratobranchial (1, 5); epi, epibranchial (2); fpf, frontoparietal fontanelle; hb, hypobranchial (1); ip, iliac process; isp, ischial process; lf, lymphatic foramina; nc, nasal capsule; msc, mesocondyle; mtc, metacondyle; of, obturator foramen; paf, parietal fossa; pb, pharyngobranchial (2); pc, procondyle; pcf, precerebral fontanelle; ph, pseudohyal (ventral); pop, postorbital process; pp, prepelvic process; prp, preorbital process; pvf, posteroventral fenestra; sp, supraorbital process.
FIGURE 7 in A new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the Rio Negro, Amazonas, Brazil: the smallest species of Potamotrygon
FIGURE 7. SEM photos of dorsal denticles near posterior mid-disc in Potamotrygon wallacei n. sp., showing conspicuous morphology of rounded protuberances forming a Y-shaped pattern (MZUSP 10290).
FIGURE 12 in A new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the Rio Negro, Amazonas, Brazil: the smallest species of Potamotrygon
FIGURE 12. Maps showing distribution of Potamotrygon wallacei n. sp. in the Rio Negro basin (on left) and in the region near Barcelos (on right), upper Rio Negro basin, highlighting sampling efforts underway by one of us (MLG) since the mid-1990's (note that some collection localities occurred in small streams not indicated on map).
FIGURE 1 in A new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the Rio Negro, Amazonas, Brazil: the smallest species of Potamotrygon
FIGURE 1. Dorsal (A) and ventral (B) views of holotype of Potamotrygon wallacei n. sp. (adult female, MZUSP 117809, 371 mm TL). Note that specimen lacks distal tip of tail and anteriormost caudal sting (smaller, posterior caudal sting shown), and that disc is slightly curled in B.
FIGURE 2 in A new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the Rio Negro, Amazonas, Brazil: the smallest species of Potamotrygon
FIGURE 2. Dorsal (A) and ventral (B) views of paratype of Potamotrygon wallacei n. sp. (adult male, MZUSP 117806, 367 mm TL). Specimen was dissected to study ventral lateral-line canals (skin slightly displaced).
FIGURE 5 in A new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the Rio Negro, Amazonas, Brazil: the smallest species of Potamotrygon
FIGURE 5. Dorsal view of live adult male specimen. Note large, lighter blotches on back that in many specimens coalesce to form amphora- or Ω-shaped figure, smaller spots closer to disc margins, particular coloration on eyes, and lateral darker bands on tail (photo courtesy of J.K. Langhammer).
FIGURE 11 in A new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the Rio Negro, Amazonas, Brazil: the smallest species of Potamotrygon
FIGURE 11. Clasper skeleton of adult male (UFPB 5216, 345 mm TL). A) Dorsal view. B) Ventral view. Abbreviations: at, accessory terminal cartilage; ax, axial cartilage; be, beta cartilage; bp, basipterygium; bs, basal segment; dm, dorsal marginal cartilage; dt2, dorsal terminal 2 cartilage; vm, ventral marginal cartilage; vt, ventral terminal cartilage.
FIGURE 4 in A new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the Rio Negro, Amazonas, Brazil: the smallest species of Potamotrygon
FIGURE 4. Live and freshly caught specimens of Potamotrygon wallacei n. sp., showing variation in dorsal color pattern. A) From aquabr.com.br/artigos/peixes/arraia-de-agua-doce. B–E) From R. Hardwick (specimens in D are neonates; note great height of dorsal finfold in tail above specimen in E). F–G) Courtesy of N. Labbish Chao (note distinct amphora-shaped mark on disc center in G).
FIGURE 9 in A new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the Rio Negro, Amazonas, Brazil: the smallest species of Potamotrygon
FIGURE 9. Aspects of the skeletal anatomy and dermal denticles and spines of Potamotrygon wallacei n. sp., from radiographs in dorsoventral view. A) Head region (adult male paratype, MZUSP 117806, 367 mm TL). B) Right scapular region (specimen as in A). C) Right pelvic fin and adult clasper (specimen as in A). D) Base of tail region, showing distribution and development of dermal denticles and spines (paratype, MZUSP 117804, adult female, 325 mm TL). E) Tail and pelvic region, showing dermal denticles, spines, and caudal sting (paratype, MZUSP 104962, adult female, 345 mm TL). Abbreviations: ac, angular cartilage; apr, anterior segment of propterygium; at, accessory terminal cartilage; ax, axial cartilage; bp, basipterygium; cs, caudal sting; dm, dorsal marginal cartilage; dt2, dorsal terminal 2 cartilage; fpf, frontoparietal fontanelle; hyo, hyomandibula; mc, Meckel's cartilage; no, nasal opening (nasal aperture); mes, mesoterygium; met, metapterygium; pcf, precerebral fontanelle; pro, propterygium; prp, preorbital process; psc, prespiracular cartilage; scp, scapular process; vm, ventral marginal cartilage; vt, ventral terminal cartilage.
FIGURE 14. Typical habitats where Potamotrygon wallacei n in A new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the Rio Negro, Amazonas, Brazil: the smallest species of Potamotrygon
FIGURE 14. Typical habitats where Potamotrygon wallacei n. sp. is common. Upper left: Igarapé Daraquá, near the mouth of Rio Itu, left bank of the Rio Negro just above Barcelos (AM, Brazil). Upper right: typical flooded forest ("igapó") habitat (Rio Itu). Lower left: live specimen resting in a tank in the Rio Itu, showing its great transparency. Lower right: Igarapé Cazurucu, affluent of Rio Itu.
FIGURE 8 in A new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the Rio Negro, Amazonas, Brazil: the smallest species of Potamotrygon
FIGURE 8. Ventral lateral-line canals of Potamotrygon wallacei n. sp. (paratype, MZUSP 117806, adult male, 367 mm TL). Abbreviations: ajl, anterior jugular loop; ast, anterior subpleural tubules; hyoc, hyomandibular canal; ioc, infraorbital canal; iol, infraorbital loop; jug, jugular canal; man, mandibular canal; pjl, posterior jugular loop; pnl, prenasal loop; pst, posterior subpleural tubule; soc, supraorbital canal; sol, suborbital loop; spl, subpleural loop.
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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.