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306 results for “freshwater snail”
Figure 1 in A unique radiation of marine littorinid snails in the freshwater streams of the Western Ghats of India: the genus Cremnoconchus W.T. Blanford, 1869 (Gastropoda: Littorinidae)
Figure 1. Measurements and terminology of shell and operculum (illustrated by Cremnoconchus syhadrensis). Abbreviations: B, breadth; DS, diameter of spiral part of operculum; H, height; H2, height of last two whorls; LA, length of aperture (in apertural plane); OL, opercular length (excluding flexible flange); p, periphery; U, width of pseudumbilicus; WA, width of aperture (in apertural plane). Shape indices: shell shape = H2/B; apertural shape = LA/WA; opercular ratio = OL/DS.
Figure 6 in A unique radiation of marine littorinid snails in the freshwater streams of the Western Ghats of India: the genus Cremnoconchus W.T. Blanford, 1869 (Gastropoda: Littorinidae)
Figure 6. Anatomy of Cremnoconchus syhadrensis. A, B, D–G, penes (A, E–F, fixed in ethanol; B, D, live). E–G are three views of single penis, external (E), with base sectioned (F), and with coiled penial vas deferens displaced to the right to show retractor muscle and with filament sectioned to show continuation of vas deferens to its tip (G). C, pallial oviduct and egg removed from straight section. A, Matheran, Raigad Dist., Maharashtra (BMNH 20120035; shell H = 7.4 mm). B, C, E–G, Matheran, Raigad Dist., Maharashtra (ZSI/WGRS; shell H: B = 7.2 mm; C = 7.2 mm; D = 5.8 mm; E–G = 7.5 mm). D, Khandala, Pune Dist., Maharashtra (ZSI/WGRS). Abbreviations and shading conventions: b, copulatory bursa (dashed outline, visible by transparency); c, cavity surrounding penial vas deferens and retractor muscle (black); d, distal to this point the penial vas deferens is tightly bound to the sheath of the retractor muscle; e.g. egg groove visible by transparency (thick line); f, penial filament; g, opaque glandular region of penial base (medium stipple); gc, firm gelatinous coating of mature egg; i, invagination of penial base (shaded); o, position of terminal opening of pallial oviduct into mantle cavity; oag, opaque part of albumen gland (dense stipple); ov, ovum; pvd, penial vas deferens; rm, retractor muscle of penial filament; ss, straight section of pallial oviduct; tag, translucent region of albumen gland (sparse stipple).
Supplementary material 7 from: Wongpim T, Komsuwan J, Janmanee C, Thongchot P, Limsampan S, Wichiannarat N, Chaowatut W, Suwanrat S, Dechruksa W, Veeravechsukij N, Glaubrecht M, Krailas D (2023) Freshwater pulmonate snails and their potential role as trematode intermediate host in a cercarial dermatitis outbreak in Southern Thailand. Evolutionary Systematics 7(2): 293-315. https://doi.org/10.3897/evolsyst.7.107847
Some characters of Diplostomum baeri eucaliae cercaria found in this study and the reference sources
Supplementary material 8 from: Wongpim T, Komsuwan J, Janmanee C, Thongchot P, Limsampan S, Wichiannarat N, Chaowatut W, Suwanrat S, Dechruksa W, Veeravechsukij N, Glaubrecht M, Krailas D (2023) Freshwater pulmonate snails and their potential role as trematode intermediate host in a cercarial dermatitis outbreak in Southern Thailand. Evolutionary Systematics 7(2): 293-315. https://doi.org/10.3897/evolsyst.7.107847
Some characters of Ophthalmoxiphidiocercaria (Family Allocreadiidae) found in this study and the reference sources
Data from: Characterising a hybrid zone between a cryptic species pair of freshwater snails
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Systematics and geographical distribution of Galba species, a group of cryptic and worldwide freshwater snails
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Data from: Increase in multiple paternity across the reproductive lifespan in a sperm-storing, hermaphroditic freshwater snail
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Endogenous rhythm shift and adaptation to the tidal environment in the freshwater snail
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Data from: Clonal diversity driven by parasitism in a freshwater snail
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Data from: Environmental versus anthropogenic effects on population adaptive divergence in the freshwater snail Lymnaea stagnalis
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Data from: Discordance between nuclear and mitochondrial genomes in sexual and asexual lineages of the freshwater snail Potamopyrgus antipodarum
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Data from: Responses of four submerged macrophytes to freshwater snail density (Radix swinhoei) under clear-water conditions: a mesocosm study
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Changes in transcriptomic response to salinity stress induce the brackish water adaptation in a freshwater snail
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Data from: Ancient drainage networks mediated a large-scale genetic introgression in the East Asian freshwater snails
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Data from: Contrasting the distribution of phenotypic and molecular variation in the freshwater snail Biomphalaria pfeifferi, the intermediate host of Schistosoma mansoni
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Data from: Wide variation in ploidy level and genome size in a New Zealand freshwater snail with coexisting sexual and asexual lineages
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Data from: Genetic variation for mitochondrial function in the New Zealand freshwater snail Potamopyrgus antipodarum
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Data from: Isotopic turnover rates and diet-tissue discrimination depend on feeding habits of freshwater snails
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Data from: The effects of diet and mating system on reproductive (and post-reproductive) lifespan in a freshwater snail
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Data from: Camouflaged or tanned: plasticity in freshwater snail pigmentation
By having phenotypically plastic traits, such as morphology, behaviour and life history, many organisms optimise their fitness in response to fluctuating threats. Freshwater snails with translucent shells, e.g. snails from the Radix genus, differ considerably in their mantle pigmentation patterns, with snails from the same water body ranging from completely dark pigmented to only a few dark patterns. These pigmentation differences have previously been suggested to be genetically fixed, but we suggest that this polymorphism is due to phenotypic plasticity in response to a fluctuating environment. Hence, we here aimed at assessing if common stressors, including ultraviolet radiation (UVR) and predation, induce a plastic response in mantle pigmentation patterns of Radix balthica. We show, in contrast to previous studies, that snails are plastic in their expression of mantle pigmentation in response to changes in UVR and predator threats, i.e. differences among species or populations are not genetically fixed. When exposed to cues from visually hunting fish, R. balthica increased the proportion of their dark pigmentation, suggesting a crypsis strategy. Snails increased their pigmentation even further in response to UVR, but this also lead to reduced complexity of the patterns. Furthermore, when exposed to UVR and fish, snails responded in the same way as in the UVR treatment, suggesting a trade-off between photoprotection and crypsis.
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International Brain Laboratory public data
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OpenNeuro
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