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48 results for “Hypsibius”
FIGURE 31 in An integrative redescription of Hypsibius dujardini (Doyère, 1840), the nominal taxon for Hypsibioidea (Tardigrada: Eutardigrada)
FIGURE 31. An ML COI-based phylogenetic tree of the subfamily Hypsibiinae with; Mesocrista spitzbergensis (Itaquasconinae) as an outgroup. ML bootstrap support values are presented below tree branches.
FIGURE 30. A in An integrative redescription of Hypsibius dujardini (Doyère, 1840), the nominal taxon for Hypsibioidea (Tardigrada: Eutardigrada)
FIGURE 30. A Bayesian phylogenetic tree of the family Hypsibiidae based on 18S rRNA sequences, with two Macrobiotus spp. as an outgroup. Bayesian posterior probability values are given above tree branches whereas ML support values are below branches. The scale refers to the Bayesian tree.
FIGURES 13–16 in An integrative redescription of Hypsibius dujardini (Doyère, 1840), the nominal taxon for Hypsibioidea (Tardigrada: Eutardigrada)
FIGURES 13–16. Hypsibius exemplaris sp. nov., claws: 13—claws III (PCM, holotype); 14—claws IV, arrowhead points longitudinal bar at the posterior claw basis, and empty arrowhead indicates pseudolunula at the anterior claw basis (PCM, paratype); 15—claws III (SEM, paratype); 16—claws IV, arrowhead points longitudinal bar at the posterior claw basis, and empty arrowhead indicates pseudolunula at the anterior claw basis (SEM, paratype). All scale bars in µm.
FIGURE 1. A in Tardigrades of the Australian Antarctic: Hypsibius heardensis (Eutardigrada: Hypsibiidae: dujardini group) a new species from sub-Antarctic Heard Island
FIGURE 1. A, Antarctica and the subAntarctic islands in a polar projection, showing the position of Heard Island. B, Heard Island. Red Island, a promontory off Laurens Peninsula to the northwest indicated with an arrow.
FIGURE 3 in Tardigrades of the Australian Antarctic: Hypsibius heardensis (Eutardigrada: Hypsibiidae: dujardini group) a new species from sub-Antarctic Heard Island
FIGURE 3. Hypsibius heardensis sp. nov. A, dorsal view buccal apparatus. B, lateral view buccal apparatus. C, claws of legs III. D, claws of legs IV. Scale bars = 10 micrometers.
FIGURE 2 in Tardigrades of the Australian Antarctic: Hypsibius heardensis (Eutardigrada: Hypsibiidae: dujardini group) a new species from sub-Antarctic Heard Island
FIGURE 2. Hypsibius heardensis sp. nov. A, habitus (lateral view). B–C, buccal apparatus (B – dorsal view, C – lateral view). D, claws of legs III. E, claws of legs IV.
FIGURES 2628. Hypsibius pallidus Thulin, 1911. 26 – habitus. 27 in Water Bears (Tardigrada) of the Bieszczady Mountains (Poland, West Carpathians)
FIGURES 2628. Hypsibius pallidus Thulin, 1911. 26 – habitus. 27 – claws of IV pair of legs. 28 – buccal apparatus.
Data from: Cellular morphology of leg musculature in the water bear Hypsibius exemplaris (Tardigrada) unravels serial homologies
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Fig. 8 in Integrative redescription of Hypsibius pallidoides Pilato et al., 2011 (Eutardigrada: Hypsibioidea) with the erection of a new genus and discussion on the phylogeny of Hypsibiidae
Fig. 8 (opposite page). The phylogeny of Hypsibioidea based on 18S rRNA seqences. Numbers at nodes indicate Bayesian posterior probability values (BI, first values) and bootstrap values (ML, second values). Black dots indicate the nodes supported by values of 1.0/100% with both methods. Scale bar and branch lengths refer to the Bayesian analysis.
Fig. 5 in Integrative redescription of Hypsibius pallidoides Pilato et al., 2011 (Eutardigrada: Hypsibioidea) with the erection of a new genus and discussion on the phylogeny of Hypsibiidae
Fig. 5. Hypsibius pallidoides Pilato, Kiosya, Lisi, Inshina & Biserov, 2011, bucco-pharyngeal apparatus. A. Lateral view of the bucco-pharyngeal apparatus, black arrowheads indicate the thickenings of the buccal tube, white arrow indicates the septulum (SPbU 251(109)), PhC. B. Dorsal AISM (SPbU 251(82)), DIC. C. Ventral AISM (SPbU 251(82)), DIC. D. Pharyngeal bulb, black arrowhead indicates the pharynx outline, black arrow indicates the cuticular line connecting second macroplacoid with septulum, white arrow indicates the septulum, white arrowhead indicates the "pseudoseptulum" (SPbU 251(89)), PhC. E. Macroplacoids, black arrowhead indicates the constriction of the first macroplacoid (SPbU 251(89)), DIC. F. Cuticular structures of the pharynx, black arrowhead indicates the constriction of the first macroplacoid, black arrow indicates the constriction of the second macroplacoid, SEM. Scale bars: A–E = 5 µm; F = 2 µm.
Fig. 2 in Integrative redescription of Hypsibius pallidoides Pilato et al., 2011 (Eutardigrada: Hypsibioidea) with the erection of a new genus and discussion on the phylogeny of Hypsibiidae
Fig. 2. Hypsibius pallidoides Pilato, Kiosya, Lisi, Inshina & Biserov, 2011, dorsal sculpture. A. Type series specimen (KNU Чер-9 II), PhC. B. Type series specimen (KNU Чер-9 II), DIC. C. Specimen from Austria (SPbU 251(82)), PhC. D. Specimen from Russia (SPbU 113(3)). Scale bars = 5 µm.
Fig. 1 in Integrative redescription of Hypsibius pallidoides Pilato et al., 2011 (Eutardigrada: Hypsibioidea) with the erection of a new genus and discussion on the phylogeny of Hypsibiidae
Fig. 1. Hypsibius pallidoides Pilato, Kiosya, Lisi, Inshina & Biserov, 2011, total view. A. Phase contrast (SPbU 251(82)). B. Dorsal view in SEM. C. Ventral view in SEM. Scale bars = 50 µm.
Fig. 10 in Integrative redescription of Hypsibius pallidoides Pilato et al., 2011 (Eutardigrada: Hypsibioidea) with the erection of a new genus and discussion on the phylogeny of Hypsibiidae
Fig. 10. Details of the egg shell structure in Macrobiotidae. A. Egg shell surface of Macrobiotus cf. sottilei Pilato, Kiosya, Lisi & Sabella, 2012, white arrowheads indicate the internal pillars of the egg shell, SEM. B. Fragment of the outer shell layer of M. cf. sottilei egg visible from inside, with numerous pillars, deriving from the lower surface of the reticulated outer layer, SEM. C. Fragment of the egg surface of Tenuibiotus voronkovi (Tumanov, 2006) with granulation-like pattern visible between the egg processes (SPbU 205(4)), PhC. D. Fragment of the egg shell of T. voronkovi in SEM, note the absence of the surface granulation. Scale bars: A–B = 2 µm; C–D = 5 µm.
Fig. 3 in Integrative redescription of Hypsibius pallidoides Pilato et al., 2011 (Eutardigrada: Hypsibioidea) with the erection of a new genus and discussion on the phylogeny of Hypsibiidae
Fig. 3. Hypsibius pallidoides Pilato, Kiosya, Lisi, Inshina & Biserov, 2011. A. Dorsal view of the caudal body end, white arrowheads indicate the dorsal inflations of the hind legs, SEM. B. Dorsal sculpture of the caudal body region, SEM. C. Dorsal surface of the head region, black arrowheads indicate the elliptical sensory organs, white arrowhead indicates the central concavity on the dorsal surface of the head, SEM. D. Dorsal surface of the head region, black arrowheads indicate the elliptical sensory organs (SPbU 251(89)), PhC. Scale bars = 5 µm.
Fig. 9. Hypsibius scaber Maucci, 1987 in Integrative redescription of Hypsibius pallidoides Pilato et al., 2011 (Eutardigrada: Hypsibioidea) with the erection of a new genus and discussion on the phylogeny of Hypsibiidae
Fig. 9. Hypsibius scaber Maucci, 1987, holotype (MCVR C.T. 12289) (A–G, I) and paratype (MCVR C.T. 12288) (H). A. Dorsal view of the caudal body end, PhC. B. Dorsal view of the caudal body end, DIC. C. Bucco-pharyngeal apparatus, PhC. D. Ventral view of the caudal body end, PhC. E. Ventral view of the caudal body end, DIC. F. Bucco-pharyngeal apparatus, DIC. G. Dorsal surface of the head region, white arrowheads indicate the presumable elliptical sensory organs, DIC. H. Claws of leg III, PhC. I. Claws of leg IV, PhC. Scale bars: A–B, D–E = 20 µm; C, F–I = 10 µm. Photo G presented by R. Guidetti, University of Modena and Reggio Emilia, Italy.
Fig. 6 in Integrative redescription of Hypsibius pallidoides Pilato et al., 2011 (Eutardigrada: Hypsibioidea) with the erection of a new genus and discussion on the phylogeny of Hypsibiidae
Fig. 6 (opposite page). Hypsibius pallidoides Pilato, Kiosya, Lisi, Inshina & Biserov, 2011, claws. Specimens SPbU 251(82) (A, C, E) and KNU Чер-9 II (B, D, F). A. Claws of leg I, black arrowhead indicates the flexible part of the external claw main branch, black arrows indicates the lunule of the internal claw, PhC. B. Claws of leg III, type series specimen, black arrowhead indicates the flexible part of the external claw main branch, PhC. C. Claws of leg II, white arrow indicates the elongated bulge near the base of the internal claw, white asterisk – pulvilla on the inner side of the leg, PhC. D. Claws of leg IV, type series specimen, black arrow indicates the filamentous structure connecting the external claw main branch with the claw base, PhC. E. Claws of leg IV, black arrow indicates the thickened region on the lunule margin, PhC. F. Claws of leg IV, type series specimen, black arrow indicates the thickened region on the lunule margin, PhC. G. Claws of leg II, white arrowhead indicates the lateral crest of the claw base, SEM. H. Claws of leg III, white arrow indicates the elongated bulge near the base of the internal claw, white asterisk – pulvilla on the inner side of the leg, SEM. I. Claws of leg IV, white arrowhead indicates the lateral crest of the claw base, SEM
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.
Data from: Analysis of the opsin repertoire in the tardigrade Hypsibius dujardini provides insights into the evolution of opsin genes in Panarthropoda
<p>Screening of a deeply sequenced transcriptome using Illumina sequencing as well as the genome of the tardigrade <em>Hypsibius exemplaris </em>(referred to as <em>Hypsibius dujardini </em>in the published article) revealed a set of five opsin genes.To clarify the phylogenetic position of these genes and to elucidate the evolutionary history of opsins in Panarthropoda (Onychophora +Tardigrada+Arthropoda), we reconstructed the phylogeny of broadly sampled metazoan opsin genes using maximum likelihood and Bayesian inference methods in conjunction with carefully selected substitution models. According to our findings, the opsin repertoire of <em>H. exemplaris</em> comprises representatives of all three major bilaterian opsin clades, including one r-opsin, three c-opsins, and a Group 4 opsin (neuropsin/opsin-5). The identification of the tardigrade ortholog of neuropsin/opsin-5 is the first record of this opsin type in a protostome,but our screening of available metazoan genomes revealed that it is also present in other protostomes. Our opsin phylogeny further suggests that two r-opsins, including an "arthropsin", were present in the last common ancestor of Panarthropoda. Although both r-opsin lineages were retained in Onychophora and Arthropoda, the arthropsin was lost in Tardigrada. The single (most likely visual) r-opsin found in <em>H. exemplaris</em> supports the hypothesis of monochromatic vision in the panarthropod ancestor, whereas two duplications of the ancestral panarthropod c-opsin have led to three c-opsins in tardigrades. Although the early-branching nodes are unstable within the metazoans, our findings suggest that the last common ancestor of Bilateria possessed six opsins: Two r-opsins, one c-opsin, and three Group 4 opsins, one of which (Go opsin) was lost in the ecdysozoan lineage.</p>
Data from: Tolerance to gamma radiation in the tardigrade Hypsibius dujardini from embryo to adult correlate inversely with cellular proliferation
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Data from: Analysis of the opsin repertoire in the tardigrade Hypsibius dujardini provides insights into the evolution of opsin genes in Panarthropoda
Open the record for dataset details and reuse information.
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