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243 results for “Rotifer”
Image 3 in Faunal diversity of rotifers (Rotifera: Eurotatoria) of Nokrek Biosphere Reserve, Meghalaya, India
Image 3. Brachionus mirabilis Daday, ventral view
Image 2 in Faunal diversity of rotifers (Rotifera: Eurotatoria) of Nokrek Biosphere Reserve, Meghalaya, India
Image 2. Lecane unguitata (Fadeev), ventral view
FIG. 5 in On some rare and new species of rotifers (Digononta, Bdelloida; Monogononta, Ploima and Flosculariaceae) in the Kaw River estuary (French Guiana)
FIG. 5. — Testudinella haueriensis Gillard, 1967. Scale bar: 50 µm.
Ineffective integration of multiple antipredator defences in a rotifer: a low-cost insurance?
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Comparative phylogeography reveals consistently shallow genetic diversity in a mitochondrial marker in Antarctic bdelloid rotifers
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PLATE I. Lepadellidae, microphotographs. 1 in Eight new Lepadellidae (Rotifera, Monogononta) from the Congo bring to level endemism in Africa's rotifers
PLATE I. Lepadellidae, microphotographs. 1: Colurella asymmetrica n. sp., ventral view; 2: Squatinella longipila n. sp.; 3: Squatinella curviseta n. sp.; 4: Lepadella hanneloreae n. sp., habitus; 5: L. jingruae n. sp., habitus; 6: L. wilungulai n. sp., habitus; 7: L. weijiai n. sp., habitus; 8: L. yangambi n. sp., habitus;
FIGURE 1 in Rotifers from inland water bodies of continental Ecuador and Galápagos Islands An updated checklist
FIGURE 1. Map of Ecuador showing number of recorded rotifer families, genera and species in each region.
Data from: Integrative taxonomy recognizes evolutionary units despite widespread mitonuclear discordance: evidence from a rotifer cryptic species complex
Mitonuclear discordance across taxa is increasingly recognized as posing a major challenge to species delimitation based on DNA sequence data. Integrative taxonomy has been proposed as a promising framework to help address this problem. However, we still lack compelling empirical evidence scrutinizing the efficacy of integrative taxonomy in relation to, for instance, complex introgression scenarios involving many species. Here, we report remarkably widespread mitonuclear discordance between about 15 mitochondrial and four nuclear Brachionus calyciflorus groups identified using different species delimitation approaches. Using coalescent-, Bayesian admixture-, and allele sharing-based methods with DNA sequence or microsatellite data, we provide strong evidence in support of hybridization as a driver of the observed discordance. We then describe our combined molecular, morphological, and ecological approaches to resolving phylogenetic conflict and inferring species boundaries. Species delimitations based on the ITS1 and 28S nuclear DNA markers proved a more reliable predictor of morphological variation than delimitations using the mitochondrial COI gene. A short-term competition experiment further revealed systematic differences in the competitive ability between two of the nuclear-delimited species under six different growth conditions, independent of COI delimitations; hybrids were also observed. In light of these findings, we discuss the failure of the COI marker to estimate morphological stasis and morphological plasticity in the B. calyciflorus complex. By using B. calyciflorus as a representative case, we demonstrate the potential of integrative taxonomy to guide species delimitation in the presence of mitonuclear phylogenetic conflicts.
Data from: Spatial and temporal escape from fungal parasitism in natural communities of anciently asexual bdelloid rotifers
Sexual reproduction is costly, but it is nearly ubiquitous among plants and animals, whereas obligately asexual taxa are rare and almost always short-lived. The Red Queen hypothesis proposes that sex overcomes its costs by enabling organisms to keep pace with coevolving parasites and pathogens. If so, the few cases of stable long-term asexuality ought to be found in groups whose coevolutionary interactions with parasites are unusually weak. In theory, antagonistic coevolution will be attenuated if hosts disperse among patches within a metapopulation separately from parasites and more rapidly. We examined whether these conditions are met in natural communities of bdelloid rotifers, one of the longest-lived asexual lineages. At any life stage, these microscopic invertebrates can tolerate the complete desiccation of their ephemeral freshwater habitats, surviving as dormant propagules that are readily carried by the wind. In our field experiments, desiccation and wind transport enabled bdelloids to disperse independently of multiple fungal parasites, in both time and space. Surveys of bdelloid communities in unmanipulated moss patches confirmed that fungal parasitism was negatively correlated with extended drought and increasing height (exposure to wind). Bdelloid ecology therefore matches a key condition of models in which asexuals persist through spatio-temporal decoupling from coevolving enemies.
FIGURE 2. Cotylegaleata iskenderunensis n in Cotylegaleata iskenderunensis n. sp., the second known species of the rotifer family Cotylegaleatidae (Monogononta: Ploima)
FIGURE 2. Cotylegaleata iskenderunensis n. sp., A. habitus adult female, ventral; B. head shield, dorsal; C. head, lateral; D. cross sectional view, head shield pointing ventral; E. habitus immature female, ventral; F. trophi, ventral; G. fulcrum, lateral right. c: cotyle; ca: callosities; hs: head shield; mo: mouth opening; vm: antero-ventral lorica margin. Scale bars: A−E: 50 µm; F, G: 25 µm.
FIGURE 4 A–D. Cephalodella ungulata n in Cephalodella ungulata n. sp. (Monogononta: Notommatidae), a new rotifer species from North-West Germany, with notes on C. tenuiseta (Burn, 1890)
FIGURE 4 A–D. Cephalodella ungulata n. sp., habitus (S.E.M. photographs, A, C, D lying on the dorsal side). A: lateral view B: dorsal view C: frontal view, rotatory organ D: caudal view.
FIGURE 2 A–F. Cephalodella ungulata n in Cephalodella ungulata n. sp. (Monogononta: Notommatidae), a new rotifer species from North-West Germany, with notes on C. tenuiseta (Burn, 1890)
FIGURE 2 A–F. Cephalodella ungulata n. sp., trophi (S.E.M. photographs). A: dorso-lateral view B: lateral view C: ventro-lateral view D: caudal view E: frontal view F: ventral view.
FIGURE 1 A–D. Cephalodella ungulata n in Cephalodella ungulata n. sp. (Monogononta: Notommatidae), a new rotifer species from North-West Germany, with notes on C. tenuiseta (Burn, 1890)
FIGURE 1 A–D. Cephalodella ungulata n.sp, habitus. A: outline of body, dorsal view B: dorsal view with inner organisation C: outline of body, lateral view D: lateral view with inner organisation.
FIGURE 12 in Comparison of the predatory rotifers Pleurotrocha petromyzon (Ehrenberg, 1830) and Pleurotrocha sigmoidea Skorikov, 1896 (Rotifera: Monogononta: Notommatidae) based on light and electron microscopic observations
FIGURE 12. SEM images of the trophi of Pleurotrocha robusta. A. Ventral view. B. Lateral view. C. Latero-frontal view. al alula, dmc dorsal manubrial chamber, fu fulcrum, hyp hypopharynx, man manubrium, mmc median manubrial chammber, ommc opening of median manubrial chamber, rbc ramus basal chamber, rfb ramus foramen basalis, rfsb ramus foramen subbasalis, rsbc ramus subbasal chamber, un uncus.
FIGURE 11 in Comparison of the predatory rotifers Pleurotrocha petromyzon (Ehrenberg, 1830) and Pleurotrocha sigmoidea Skorikov, 1896 (Rotifera: Monogononta: Notommatidae) based on light and electron microscopic observations
FIGURE 11. Light microscopic images of Pleurotrocha robusta. A. Adult female. B. Juvenile specimen. C. Slightly compressed adult specimen. br brain, eg egg, gg gastric glands, gv germovitellarium, mx mastax, rco retrocerebral organ, st stomach. Arrow head (cerebral eye with low position).
FIGURE 10 in Comparison of the predatory rotifers Pleurotrocha petromyzon (Ehrenberg, 1830) and Pleurotrocha sigmoidea Skorikov, 1896 (Rotifera: Monogononta: Notommatidae) based on light and electron microscopic observations
FIGURE 10. TEM image of longitudinal section through head of Pleurotrocha petromyzon. ey eye, fu fulcrum, mx mastax, oe oesophagus, ra ramus, rco retrocerebral organ. Arrow (vesicle-filled sphere). Arrow head (opening of the retrocerebral organ).
FIGURE 7 in Comparison of the predatory rotifers Pleurotrocha petromyzon (Ehrenberg, 1830) and Pleurotrocha sigmoidea Skorikov, 1896 (Rotifera: Monogononta: Notommatidae) based on light and electron microscopic observations
FIGURE 7. SEM images of Pleurotrocha petromyzon. A. Lateral view. B. Dorsal view. C. Ventral view. D. Frontal view. E. Head in ventral view with epidermal projection covering the mouth opening (arrow). F. Egg in Carchesium -colony. eg egg. Arrow head (dorsal antenna)
FIGURE 2 in Comparison of the predatory rotifers Pleurotrocha petromyzon (Ehrenberg, 1830) and Pleurotrocha sigmoidea Skorikov, 1896 (Rotifera: Monogononta: Notommatidae) based on light and electron microscopic observations
FIGURE 2. Light-microscope images of Pleurotrocha sigmoidea. A, head of adult female. B, juvenile among Vorticella aggregation. C, adult female. bl bladder, br brain, eg egg, gv germovitellarium, in intestine, ld lipid droplets, mx mastax, pgl pedal glands, rco rectrocerebral organ, st stomach, sgl salivary gland.
FIGURE 4 in Comparison of the predatory rotifers Pleurotrocha petromyzon (Ehrenberg, 1830) and Pleurotrocha sigmoidea Skorikov, 1896 (Rotifera: Monogononta: Notommatidae) based on light and electron microscopic observations
FIGURE 4. SEM images of the trophi of Pleurotrocha sigmoidea. A, ventral view. B, dorsal view. C, lateral view. D, laterofrontal view. al alula, ca cauda, cl clava, fu fulcrum, man manubrium, odmc opening of dorsal manubrial chamber, ommc opening of median manubrial chamber, ovmc opening of ventral manubrial chamber, rbc ramus basal chamber, rfb ramus foramen basalis, rfsb ramus foramen subbasalis, rsbc ramus subbasal chamber, un uncus. Arrow (projection of ventral manubrial chamber).
FIGURE 9 in Comparison of the predatory rotifers Pleurotrocha petromyzon (Ehrenberg, 1830) and Pleurotrocha sigmoidea Skorikov, 1896 (Rotifera: Monogononta: Notommatidae) based on light and electron microscopic observations
FIGURE 9. SEM images of the trophi of Pleurotrocha petromyzon. A. Ventral view. B. Dorsal view. C. Ventro-lateral view. D. Frontal view. al alula, ca cauda, cl clava, fu fulcrum, hyp hypopharynx, man manubrium, ommc opening of median manubrial chamber, ovmc opening of ventral manubrial chamber, rfb ramus foramen basalis, rfsb ramus foramen subbasalis, rbc ramus basal chamber, rsbc ramus subbasal chamber, un uncus. Arrow (projection of ventral manubrial chamber).
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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.