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6,771 results for “freshwater”
FIGURE 6 in Potamotrygon rex, a new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the middle and upper rio Tocantins, Brazil, closely allied to Potamotrygon henlei (Castelnau, 1855)
FIGURE 6. Morphological details of Potamotrygon rex, sp. nov. A) Dorsal view of snout region (paratype, MZUSP 120373); B) Lateral view of eye and spiracle (paratype, MZUSP 120373); C) Close-up of nasoral region (holotype, MZUSP 120371); D) Mouth of adult female showing external tooth rows (holotype, MZUSP 120371); E) Mouth of adult male showing external tooth rows (paratype, MZUSP 120373).
FIGURE 4 in Potamotrygon rex, a new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the middle and upper rio Tocantins, Brazil, closely allied to Potamotrygon henlei (Castelnau, 1855)
FIGURE 4. Dorsal (A) and ventral (B) views of Potamotrygon rex, sp. nov. (paratype, UNT 7144, 825 mm TL, 520 mm DL, 465 mm DW).
FIGURE 5 in Potamotrygon rex, a new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the middle and upper rio Tocantins, Brazil, closely allied to Potamotrygon henlei (Castelnau, 1855)
FIGURE 5. Dorsal (A) and ventral (B) views of juvenile specimen of Potamotrygon rex, sp. nov. (MZUSP 120352, 445 mm TL, 290 mm DL, 275 mm DW).
FIGURE 2 in Potamotrygon rex, a new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the middle and upper rio Tocantins, Brazil, closely allied to Potamotrygon henlei (Castelnau, 1855)
FIGURE 2. Dorsal (A) and ventral (B) views of of Potamotrygon rex, sp. nov. (adult male, paratype, MZUSP 120373, 825 mm TL, 526 mm DL, 475 mm DW).
FIGURE 1 in Potamotrygon rex, a new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the middle and upper rio Tocantins, Brazil, closely allied to Potamotrygon henlei (Castelnau, 1855)
FIGURE 1. Dorsal (A) and ventral (B) views of holotype of Potamotrygon rex, sp. nov. (adult female, MZUSP 120371, 1110 mm TL, 750 mm DL, 690 mm DW).
FIGURE 3 in Potamotrygon rex, a new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the middle and upper rio Tocantins, Brazil, closely allied to Potamotrygon henlei (Castelnau, 1855)
FIGURE 3. Dorsal (A) and ventral (B) views of Potamotrygon rex, sp. nov. (paratype, UNT 7146, 815 mm TL, 535 mm DL, 480 mm DW).
FIGURE 2 in Morphology and molecular phylogeny of a new freshwater ciliate Urosomoida sejongensis n. sp. (Ciliophora, Sporadotrichida, Oxytrichidae) from King George Island, Antarctica
FIGURE 2. Photomicrograph of Urosomoida sejongensis n. sp. in vivo (A–J) and after protargol impregnation (K, L). A, B. Ventral and dorsal view. Arrow denotes contractile vacuole. C, D. Lateral views. E. Dorsal view showing contractile vacuole (arrow) with dorsal bristles (DB). F. Ventral view with overall cirral arrangement. G. Ventral view with nuclear apparatus and ring-shaped structures (inserts). H. Ventral view of oral apparatus. I. Nuclear apparatus showing 1 micronucleus between 2 macronuclear nodules. J. Cortical granules (arrowhead). K, L. Dorsal and ventral view of holotype specimen, respectively. AZM—adoral zone of membranelles; BC—buccal cirrus; CC—caudal cirri; DK—dorsal kineties; DM—dorsomarginal kinety; FC—frontal cirri; FVC—frontoventral cirri; LMR—left marginal cirral row; Ma—macronuclear nodules; Mi—micronucleus; PTVC—pretransverse ventral cirri; PVC—postoral ventral cirri; RMR—right marginal cirral row; TC—transverse cirri. Scale bars: 50 µm (in A, E, K), 5 µm (in I, J).
FIGURE 3 in Morphology and molecular phylogeny of a new freshwater ciliate Urosomoida sejongensis n. sp. (Ciliophora, Sporadotrichida, Oxytrichidae) from King George Island, Antarctica
FIGURE 3. Majority consensus tree of Bayesian inference (BI) using SSU rDNA sequences. On interior branches, posterior probabilities of BI and bootstrap values of maximum likelihood (ML) are represented, respectively.
FIGURE 47 in Illustrated and online catalog of type specimens of freshwater fishes in the Colección de Peces Dulceacuícolas of Instituto de Investigación de Recursos Biológicos Alexander von Humboldt (IAvH-P), Colombia
FIGURE 47. Holotype of Rivulus (Cynodonichthys) xi, IAvH-P 11258, 55.6 mm SL (scale bar = 1 cm). Photograph by C. DoNascimiento.
FIGURE 43 in Illustrated and online catalog of type specimens of freshwater fishes in the Colección de Peces Dulceacuícolas of Instituto de Investigación de Recursos Biológicos Alexander von Humboldt (IAvH-P), Colombia
FIGURE 43. Holotype of Laimosemion leticia, IAvH-P 12943, 21.1 mm SL (scale bar = 1 cm). Photograph by C. DoNascimiento.
FIGURE 42 in Illustrated and online catalog of type specimens of freshwater fishes in the Colección de Peces Dulceacuícolas of Instituto de Investigación de Recursos Biológicos Alexander von Humboldt (IAvH-P), Colombia
FIGURE 42. Paratype of Cichlasoma orinocense, IAvH-P 10561, 82.2 mm SL (scale bar = 1 cm). Photograph by M. H. Sabaj Pérez.
FIGURE 44 in Illustrated and online catalog of type specimens of freshwater fishes in the Colección de Peces Dulceacuícolas of Instituto de Investigación de Recursos Biológicos Alexander von Humboldt (IAvH-P), Colombia
FIGURE 44. Holotype of Rivulus (Cynodonichthys) azurescens, IAvH-P 11255, 57.4 mm SL (scale bar = 1 cm). Photograph by C. DoNascimiento.
FIGURE 40 in Illustrated and online catalog of type specimens of freshwater fishes in the Colección de Peces Dulceacuícolas of Instituto de Investigación de Recursos Biológicos Alexander von Humboldt (IAvH-P), Colombia
FIGURE 40. Holotype of Apistogramma lineata, IAvH-P 11794, 30.9 mm SL (scale bar = 1 cm). Photograph by C. DoNascimiento.
FIGURE 39 in Illustrated and online catalog of type specimens of freshwater fishes in the Colección de Peces Dulceacuícolas of Instituto de Investigación de Recursos Biológicos Alexander von Humboldt (IAvH-P), Colombia
FIGURE 39. Paratype of Apionichthys sauli, IAvH-P 10566, 57.9 mm SL, eyed side (above) and blind side (below) (scale bar = 1 cm). Photograph by M. H. Sabaj Pérez.
FIGURE 37 in Illustrated and online catalog of type specimens of freshwater fishes in the Colección de Peces Dulceacuícolas of Instituto de Investigación de Recursos Biológicos Alexander von Humboldt (IAvH-P), Colombia
FIGURE 37. Paratype of Trichomycterus torcoromaensis, IAvH-P 13422, 62.2 mm SL (scale bar = 1 cm). Photograph by C. DoNascimiento.
FIGURE 36 in Illustrated and online catalog of type specimens of freshwater fishes in the Colección de Peces Dulceacuícolas of Instituto de Investigación de Recursos Biológicos Alexander von Humboldt (IAvH-P), Colombia
FIGURE 36. Paratype of Trichomycterus tetuanensis, IAvH-P 12753, 67.6 mm SL (scale bar = 1 cm). Photograph by C. DoNascimiento.
FIGURE 35 in Illustrated and online catalog of type specimens of freshwater fishes in the Colección de Peces Dulceacuícolas of Instituto de Investigación de Recursos Biológicos Alexander von Humboldt (IAvH-P), Colombia
FIGURE 35. Paratype of Trichomycterus sketi, IAvH-P 11806, 39.4 mm SL (scale bar = 1 cm). Photograph by C. DoNascimiento.
FIGURE 38 in Illustrated and online catalog of type specimens of freshwater fishes in the Colección de Peces Dulceacuícolas of Instituto de Investigación de Recursos Biológicos Alexander von Humboldt (IAvH-P), Colombia
FIGURE 38. Paratype of Trichomycterus uisae, IAvH-P 10806, 50.1 mm SL (scale bar = 1 cm). Photograph by C. DoNascimiento.
FIGURE 41 in Illustrated and online catalog of type specimens of freshwater fishes in the Colección de Peces Dulceacuícolas of Instituto de Investigación de Recursos Biológicos Alexander von Humboldt (IAvH-P), Colombia
FIGURE 41. Holotype of Apistogramma megaptera, IAvH-P 11714, 38.2 mm SL (scale bar = 1 cm). Photograph by C. DoNascimiento.
FIGURE 32 in Illustrated and online catalog of type specimens of freshwater fishes in the Colección de Peces Dulceacuícolas of Instituto de Investigación de Recursos Biológicos Alexander von Humboldt (IAvH-P), Colombia
FIGURE 32. Paratype of Trichomycterus nietoi, IAvH-P 4363, 157.8 mm SL (scale bar = 1 cm). Photograph by C. DoNascimiento.
ScienceDex guides
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These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
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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.