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441 results for “tardigrades”
Fig. 1 in Integrative taxonomy identifies two new tardigrade species (Eutardigrada: Macrobiotidae) from Greenland
Fig. 1. Macrobiotus engbergi sp. nov. Habitus. A. Dorso-ventral projection (holotype, IZiBB, slide GL.052.22, Hoyer's medium, PCM). B–C. Cuticular pores on the dorso-cephalic and dorso-caudal part of the body seen in PCM, respectively. Arrowheads indicate small oval pores. Scale bars in μm.
Fig. 17 in Integrative taxonomy identifies two new tardigrade species (Eutardigrada: Macrobiotidae) from Greenland
Fig. 17. Tenuibiotus zandrae sp. nov. Buccal apparatus seen in SEM (paratype). A. Entire buccal apparatus. B. Lateral view of the buccal crown. C. Placoids. Filled indented arrowhead indicate the first band of teeth in the oral cavity, empty indented arrowheads indicate the central constriction in the first macroplacoids and the subterminal constriction in the second macroplacoid. Scale bars in μm.
Fig. 13 in Integrative taxonomy identifies two new tardigrade species (Eutardigrada: Macrobiotidae) from Greenland
Fig. 13. Tenuibiotus zandrae sp. nov. Patches of dense granulation on legs seen in SEM (paratypes). A. External granulation on leg II (patch of dense granulation encircled). B. Internal granulation on leg III. C. Granulation on leg IV. D. Granulation on legs IV and uniformly distributed body granulation on the dorso-caudal region. Scale bars in μm.
Fig. 22 in Integrative taxonomy identifies two new tardigrade species (Eutardigrada: Macrobiotidae) from Greenland
Fig. 22. Tenuibiotus voronkovi (Tumanov, 2007), egg chorion morphology seen in SEM. A. Entire egg. B–D. Details of the egg processes and surface between them. Filled flat arrowheads indicate thickenings/ striae on the surface between processes, filled indented arrowheads indicate elongated and flexible apices of egg processes which are often folded, whereas empty indented arrowheads indicate micro pores on the chorion surface between processes. Scale bars in μm.
Fig. 2 in Integrative taxonomy identifies two new tardigrade species (Eutardigrada: Macrobiotidae) from Greenland
Fig. 2. Macrobiotus engbergi sp. nov. Cuticular pores (paratype). A–B. Cuticular pores on the dorsocephalic and dorso-caudal part of the body seen in SEM, respectively. Arrowheads indicate small oval pores Scale bars in μm.
Fig. 9 in Integrative taxonomy identifies two new tardigrade species (Eutardigrada: Macrobiotidae) from Greenland
Fig. 9. Macrobiotus engbergi sp. nov. Secondary sexual dimorphism. A. Female without gibbosities on the hind legs. B. Male with gibbosities on the hind legs. Arrowheads indicate gibbosities. Scale bars in μm.
Fig. 16 in Integrative taxonomy identifies two new tardigrade species (Eutardigrada: Macrobiotidae) from Greenland
Fig. 16. Tenuibiotus zandrae sp. nov. The oral cavity armature seen in SEM (paratype). The oral cavity armature of a single paratype seen in SEM from different angles, dorsal (A) and ventral (B) view, respectively. Filled indented arrowheads indicate the first band of teeth in the oral cavity, filled flat arrowheads indicate the second band of teeth in the oral cavity, whereas empty flat arrowheads indicate the third band of teeth in the oral cavity. Scale bars in μm.
Fig. 24 in Integrative taxonomy identifies two new tardigrade species (Eutardigrada: Macrobiotidae) from Greenland
Fig. 24. Tenuibiotus cf. voronkovi (Tumanov, 2007) from the Nordaustlandet population, eggs seen in PCM. Four different eggs under 1000× magnification. Scale bars in μm.
Figure 1 from: Fujimoto S, Jimi N (2020) A new marine tardigrade genus and species (Arthrotardigrada, Styraconyxidae) with unique pockets on the legs. Zoosystematics and Evolution 96(1): 115-122. https://doi.org/10.3897/zse.96.49676
Figure 1 Drawings of Cyaegharctus kitamurai gen. et sp. nov., holotype KUZ Z2624. A. Habitus (ventral view). B. Leg IV pocket organ. an anus, bt buccal tube, ca cavity, cE cirrus E, db dense body, ec external cirrus, go female gonopore (detail not available), ic internal cirrus, lc lateral cirrus, mc median cirrus, pc primary clava, pl placoid, op opening, sc secondary clava, soI, IV legs I and IV sensory organs, sr seminal receptacles, ss stylet support, st stylet.
Figure 2 from: Fujimoto S, Jimi N (2020) A new marine tardigrade genus and species (Arthrotardigrada, Styraconyxidae) with unique pockets on the legs. Zoosystematics and Evolution 96(1): 115-122. https://doi.org/10.3897/zse.96.49676
Figure 2 DIC and PhC micrographs of Cyaegharctus kitamurai gen. et sp. nov., adult female. A. Habitus (dorsal view). B. cephalic region (ventral view). C. Lateral cirrus. D. Buccal apparatus. E. Caudal region (ventral view) (epicuticle pillars visible). F. Leg I sensory organ and pocket organ. G. Leg II pocket organ (arrowhead indicates protruding portion). H. Leg II digits and claws. I. Leg III pocket organ. J. Leg IV pocket organ. K. female gonopore. L. Legs I–III sensory organs. M. Leg III digits and claws. A–J. holotype KUZ Z2624, K. paratype KUZ Z2625, L, M. paratype KUZ Z2626. an anus, bt buccal tube, ca cavity, cE cirrus E, db dense body, ec external cirrus, go gonopore, ic internal cirrus, lc lateral cirrus, mc median cirrus, pc primary clava, pei,e peduncles of internal and external digits, pl placoid, poI–IV legs I–IV pocket organs, pp proximal pad, sc secondary clava, soI–IV legs I–IV sensory organs, sr seminal receptacles, ss stylet support, st stylet.
Figure 3 from: Fujimoto S, Jimi N (2020) A new marine tardigrade genus and species (Arthrotardigrada, Styraconyxidae) with unique pockets on the legs. Zoosystematics and Evolution 96(1): 115-122. https://doi.org/10.3897/zse.96.49676
Figure 3 SEM micrographs of Cyaegharctus kitamurai gen. et sp. nov., four-claw juvenile paratype KUZ Z2627. A. Habitus (lateral view). B. Cephalic region (frontal view). C. Cephalic region (ventral view). D. Anus. E. Leg I sensory organ. F. Leg II sensory organ. G. Leg III sensory organ. H. Leg IV sensory organ. I. Leg IV pocket organ. J. Leg III digits and claws. ah accessory hook, an anus, cE cirrus E, ec external cirrus, fe femur, ic internal cirrus, lc lateral cirrus, mc median cirrus, pc primary clava, ph primary hook, poIII, IV legs III and IV pocket organs, pp proximal pad, sc secondary clava, sh secondary hook, soI–IV legs I–IV sensory organs, ti tibia.
Appendix 2 in Some Tardigrades From Nepal (Asia) With Integrative Description Of Macrobiotus Wandae Sp. Nov. (Macrobiotidae: Hufelandi Group)
Appendix 2. Continued
Appendix 2 in Some Tardigrades From Nepal (Asia) With Integrative Description Of Macrobiotus Wandae Sp. Nov. (Macrobiotidae: Hufelandi Group)
Appendix 2. List of sequences included in our study downloaded from the GenBank database.
FIGURE 3 in Tardigrades of Finland: new records and an annotated checklist
FIGURE 3. Claws of legs IV of Milnesium quadrifidum. Modified from Nederström (1919).
Data from: Tolerance to gamma radiation in the tardigrade Hypsibius dujardini from embryo to adult correlate inversely with cellular proliferation
Tardigrades are highly tolerant to desiccation and ionizing radiation but the mechanisms of this tolerance are not well understood. In this paper, we report studies on dose responses of adults and eggs of the tardigrade Hypsibius dujardini exposed to gamma radiation. In adults the LD50/48h for survival was estimated at ~ 4200 Gy, and doses higher than 100 Gy reduced both fertility and hatchability of laid eggs drastically. We also evaluated the effect of radiation (doses 50 Gy, 200 Gy, 500 Gy) on eggs in the early and late embryonic stage of development, and observed a reduced hatchability in the early stage, while no effect was found in the late stage of development. Survival of juveniles from irradiated eggs was highly affected by a 500 Gy dose, both in the early and the late stage. Juveniles hatched from eggs irradiated at 50 Gy and 200 Gy developed into adults and produced offspring, but their fertility was reduced compared to the controls. Finally we measured the effect of low temperature during irradiation at 4000 Gy and 4500 Gy on survival in adult tardigrades, and observed a slight delay in the expressed mortality when tardigrades were irradiated on ice. Since H. dujardini is a freshwater tardigrade with lower tolerance to desiccation compared to limno-terrestrial tardigrades, the high radiation tolerance in adults, similar to limno-terrestrial tardigrades, is unexpected and seems to challenge the idea that desiccation and radiation tolerance rely on the same molecular mechanisms. We suggest that the higher radiation tolerance in adults and late stage embryos of H. dujardini (and in other studied tardigrades) compared to early stage embryos may partly be due to limited mitotic activity, since tardigrades have a low degree of somatic cell division (eutely), and dividing cells are known to be more sensitive to radiation.
FIGURE 1 in A description of the new tardigrade Macrobiotus reinhardti (Eutardigrada: Macrobiotidae, harmsworthi group) with some remarks on the oral cavity armature within the genus Macrobiotus Schultze
FIGURE 1. Macrobiotus reinhardti sp. nov. – habitus (paratype).
FIGURE 1 in Hexapodibius christenberryae, a new species of tardigrade from North America (Eutardigrada, Calohypsibiidae)
FIGURE 1. Hexapodibius christeberryae sp. n.: habitus. (Scale bar =30 mm).
FIGURE 1 in Tardigrades from northwestern Patagonia (Neuquén Province, Argentina) with the description of three new species
FIGURE 1. Macrobiotus neuquensis sp. nov. A, habitus; B, buccopharyngeal apparatus.
FIGURE 1 in A new tardigrade, Mutaparadoxipus duodigifinis gen. nov., sp. nov. (Heterotardigrada: Arthrotardigrada), from the Southeastern United States
FIGURE 1. Mutaparadoxipus duodigifinis gen. nov., sp. nov., female. Illustration: ventral view.
FIGURES 17–18 in Two new tardigrade species from Romania (Eutardigrada: Milnesiidae, Macrobiotidae), with some remarks on secondary sex characters in Milnesium dornensis sp. nov.
FIGURES 17–18. Minibiotus diversus sp. nov.: 17—buccal apparatus (ventral view); 18—claws IV.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
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OpenNeuro
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