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306 results for “freshwater snail”
Figure 17. A–C in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 17. A–C, recent shells of Margarya monodi: A, Lake Dianchi, DCXHJ 1, 61.2 mm; B, Lake Dianchi, DCHK 1, 57.4 mm; C, Lake Dianchi, IZCAS FG89681, 50.0 mm; D, subfossil specimens, Haikou, Lake Dianchi (left to right: 60.6 mm, 67.3 mm, 61.5 mm, 65.1 mm); E, submature shell, DCHK 40, 38.2 mm; F, juvenile shell, 14.3 mm, taken from DCHK 1; G, holotype of Margarya elongata, FG00074; H, holotype of Margarya elongata var. yini, FG00096; I, holotype of Margarya tchangsii (Xia, 1982); J, original figure of Margarya monodi (Dautzenberg & Fischer, 1905).
Figure 15 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 15. Shells of Margarya oxytropoides: A, Lake Dianchi, DCXHJ 2, 65.9 mm; B, Lake Dianchi, DCXHJ 44, 53.1 mm; C, Lake Dianchi, DCXHJ 3, 54.1 mm; D, Lake Dianchi, DCHK 41, 62.1 mm; E, Lake Lugu (provided by Liu Ye); F, Lake Dianchi, FG68944, 41.0 mm; G, original figure of Paludina oxytropoides (Heude, 1889); H, juvenile shell, 14.2 mm.
Figure 14 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 14. Scanning electron micrograph showing radula of Margarya francheti from Lake Dianchi: A, central tooth; B, lateral tooth; C, inner marginal tooth; D, outer marginal tooth.
Figure 13 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 13. Shells of Margarya francheti: A, Lake Jianhu, JHFS 1, 86.9 mm; B, Lake Erhai, EHCC 11, 45.1 mm; C, Lake Dianchi, DCWLB 1, 58.3 mm; C, D, Lake Erhai, FG89708, 60.1 mm; E, holotype figure of Margarya francheti; F, holotype figure of Margarya tropidophora (E, F, from Mabille, 1886).
Figure 12 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 12. Mature juvenile shell of Margarya species: A, Margarya melanioides, JH 13, Lake Jianhu; B, Margarya francheti, EHCC 12, Lake Erhai; C, Margarya monodi, IZCAS FG89681, Lake Dianchi; D, Margarya oxytropoides, DCXHJ 44, Lake Dianchi.
Figure 11 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 11. Scanning electron micrographs of the radula of Margarya melanioides, Lake Jianhu: A, central tooth; B, lateral tooth; C, inner marginal tooth; D, outer marginal tooth.
Figure 24 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 24. Shells of Anularya mansuyi: A, Lake Yilong, FG140819, 61.6 mm; B, Lake Yilong, FG140820, 54.1 mm; C, subfossil from Luosipu Village, XYHLSP 1, 90.2 mm; D, Lake Qilu, QLH 2, 79.1 mm; E, Lake Qilu, QLH 52, 49.5 mm; F, fossil variety obsolete from rocks on a hill around Shiyanshao Village, XYSYS 12, 74.9 mm; G, fossil from rocks on a hill around Shiyanshao Village, XYSYS 1, 60.0 mm; H, specimens from Lake Yilong, YLH 1, 64.4 mm; I, submature shell from Lake Qilu, QLH 37, 42.3 mm; J, varieties from Lake Xingyun (left to right: 59.7 mm, 50.7 mm, 49.8 mm, and 50.8 mm).
Figure 5 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 5. Best maximum-likelihood (ML) phylogram based on analyses of Internal Transcribed Spacer 2 (ITS2) sequences. Numbers above branches indicate nodal support of the topology shown, by means of ML bootstrapping/MP bootstrapping/Bayesian posterior probabilities.
Figure 6 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 6. Umbilical views of the shells: A, Margarya melanioides; B, Margarya monodi; C, Margarya francheti; D, Margarya oxytropoides; E, Tchangmargarya multilabiata sp. nov.; F, Tchangmargarya yangtsunghaiensis; G, Anularya bicostata; H, Anularya mansuyi. Margarya with several weak spiral ribs; Tchangmargarya with two strong nodular spiral ribs; Anularya gen. nov. without any sculpture.
Figure 4 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 4. Best maximum-likelihood (ML) phylogram based on analyses of 16S rRNA. Numbers above branches indicate nodal support of the topology shown, by means of ML bootstrapping/MP bootstrapping/Bayesian posterior probabilities.
Figure 9 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 9. Comparison of the operculum of Cipangopaludina, Margarya, Tchangmargarya, and Anularya with respect to parameters WO–HO (width of operculum × height of of operculum) and rOS (relative operculum scar, width of opercular scar × height of opercular scar/WO–HO).
Figure 26 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 26. Shells of Anularya bicostata: A, Lake Fuxian, FXHHK 2, 61.3 mm; B, Lake Fuxian, FXHHK 1, 45.1 mm; C, Lake Fuxian, FXHHK 10, 53.8 mm; D, Lake Fuxian, FXHHK 6, 54.4 mm; E, Lake Fuxian, FXHHK 14, 40.6 mm; F, Lake Fuxian, FG89967, 45.3 mm; G, holotype of Margarya mansuyi var. bicostata, FG00089; H, juvenile shell, 12.0 mm; I, subfossil juvenile shell.
Figure 27 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 27. Scanning electron micrograph showing radula of Anularya bicostata from Lake Fuxian: A, central tooth; B, lateral tooth; C, inner marginal tooth; D, outer marginal tooth.
Figure 2 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 2. The phylogenetic relationships within the Margarya group, as indicated by the best maximum-likelihood (ML) tree for concatenated sequences of cytochrome c oxidase subunit I (COI) and 16S rRNA. Numbers above branches indicate nodal support of the shown topology by means of ML bootstrapping/maximum-parsimony (MP) bootstrapping/ Bayesian posterior probabilities.
Figure 3 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 3. Best maximum-likelihood (ML) phylogram based on analyses of cytochrome c oxidase subunit I (COI). Numbers above branches indicate nodal support of the topology shown, by means of ML bootstrapping/MP bootstrapping/ Bayesian posterior probabilities.
Figure 18 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 18. Comparison of variety of Margarya monodi, type specimens of Margarya tchangsii and Margarya elongata (data from Tchang & Tsi, 1949; Xia, 1982), with respect to parameters H and W/H.
Figure 20 in Systematic revision of the freshwater snail Margarya Nevill, 1877 (Mollusca: Viviparidae) endemic to the ancient lakes of Yunnan, China, with description of new taxa
Figure 20. Scanning electron micrographs of the radula of Tchangmargarya yangtsunghaiensis from Lake Yangzonghai: A, central tooth; B, lateral tooth; C, inner marginal tooth; D, outer marginal tooth.
Endogenous rhythm shift and adaptation to the tidal environment in the freshwater snail
<p><span>Organisms have an endogenous timekeeping system to coordinate their biological processes with environmental cycles, allowing adaptation to external rhythmic changes in their environment. Modification of biological clocks could contribute to range expansion in a novel rhythmic environment. We hypothesized that populations of freshwater species near estuaries have acquired a circatidal rhythm to synchronize with the tidal cycle. Here, we compared the locomotion activity and gene expression rhythms of the freshwater snail <em>Semisulcospira reiniana</em> between individuals inhabiting freshwater and brackish-water areas. Individuals inhabiting brackish-water areas exhibited a rhythmic activity pattern coordinated with the tidal cycle under both field and laboratory conditions. Individuals inhabiting upstream freshwater areas showed a nocturnal activity pattern. The proportion of circadian oscillating genes was greater in freshwater than </span><span>in </span><span>brackish-water individuals, while that of circatidal oscillating genes was greater in brackish-water than </span><span>in freshwater </span><span>individuals. Interestingly, expression of 16 genes exhibited circadian and circatidal rhythms in freshwater and brackish-water individuals, respectively. Additionally, transcriptome-wide population genetic analyses supported our assumption that these two populations are genetically almost identical. These findings suggest that the slight divergence contributed to the shift in the timekeeping system</span><span>, </span><span>and that endogenous rhythms could differ in their periods between freshwater and brackish-water populations. Our results provide evidence of the evolution of endogenous rhythm via range expansion to novel rhythmic environment in a single species.</span></p>
FIGURE 3 in A new freshwater snail genus and species (Gastropoda: Caenogastropoda, Cochliopidae) with extremely spinous shells from sub-recent spring deposits in northeastern Mexico
FIGURE 3. SEM images of Spinopyrgus luismaedai n. gen. et n. sp. (L–P). L. Specimen (UJMC-255) from El Molino spring with strong spines. M. Specimen (UJMC-255) apical view. N. Specimen (UJMC-256), protoconch. O. Specimen (UJMC-255), details of the strong axial elements of the body whorl. P. Specimen (UJMC-256) from Juan Guerra spring, protoconch. Q-T. Pyrgophorus parvulus (Guilding) from Río Sabinas, Coahuila, Mexico (from Czaja et al. 2022, Fig. 5A). Q, R. Specimen (UJMC 460a) from Río Sabinas from both sides. S. Same specimen with details of the spiral elements of the body whorl. T. Same specimen (UJMC 460a), protoconch.
FIGURE 2. Spinopyrgus luismaedai n. gen. et n in A new freshwater snail genus and species (Gastropoda: Caenogastropoda, Cochliopidae) with extremely spinous shells from sub-recent spring deposits in northeastern Mexico
FIGURE 2. Spinopyrgus luismaedai n. gen. et n. sp. (A–K). A–B. Holotype (UJMC-250) from Juan Guerra spring. C. Paratype 1 (UJMC-251) from Juan Guerra spring. D. Paratype 2 (UJMC-252) from Juan Guerra spring. E, F. Paratype 3 (UJMC-252a) from Juan Guerra spring, specimen with three keels. G. Specimen (UJMC-253) from El Molino spring. H. Specimen (UJMC- 254) from Juan Guerra spring. I. Specimen (UJMC-253) from El Molino spring, protoconch view. J. Paratype 3 (UJMC-251), details of the carina with spines. K. Specimen (UJMC-253b) from El Molino spring, details of the carina with shovel-shaped spines.
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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.