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828 results for “ascidian”
FIG. 18 in Deep-water ascidians from the south-western Atlantic (RV Dmitry Mendeleev, cruise 43 and Academic Kurchatov, cruise 11)
FIG. 18. Corynascidia mironovi sp. n.: (A) intact specimen; (B) dorsal area; (C) gut loop; (D) part of the branchial sac; (E) body muscles (from external side).
FIG. 16 in Deep-water ascidians from the south-western Atlantic (RV Dmitry Mendeleev, cruise 43 and Academic Kurchatov, cruise 11)
FIG. 16. Adagnesia charcoti Monniot and Monniot, 1973; (B) Proagnesia depressa (Millar, 1955). Opened specimens.
FIG. 15 in Deep-water ascidians from the south-western Atlantic (RV Dmitry Mendeleev, cruise 43 and Academic Kurchatov, cruise 11)
FIG. 15. (A) Proagnesia depressa (Millar, 1955); (B) Adagnesia charcoti Monniot and Monniot, 1973. Intact specimens.
FIG. 13 in Deep-water ascidians from the south-western Atlantic (RV Dmitry Mendeleev, cruise 43 and Academic Kurchatov, cruise 11)
FIG. 13. Agnezia abyssa sp. n.: (A) whole left side of the branchial sac of the holotype; (B) intact specimens.
FIG. 14 in Deep-water ascidians from the south-western Atlantic (RV Dmitry Mendeleev, cruise 43 and Academic Kurchatov, cruise 11)
FIG. 14. Agnezia abyssa sp. n.: (A, B) specimen with the test removed; (C) opened specimen; (D) dorsal area.
FIGURE 21 in Some new data on tropical western Pacific Ascidians
FIGURE 21. Amphicarpa duploplicata: A: body of a zooid, B: part of the posterior left side of the body, scale bar=2mm C: branchial sac.
FIGURE 20. A in Some new data on tropical western Pacific Ascidians
FIGURE 20. A: Amphicarpa duploplicata. B: Polycarpa argentata. C: Polycarpa mytiligera. D: Microcosmus exasperatus.
Figure 6 in A new ascidian-dwelling species of Leucothoe Leach, 1814 (Amphipoda: Leucothoidae) from Ilha Grande Bay, Rio de Janeiro state, Brazil
Figure 6. Leucothoe angraensis sp. nov. Female holotype (UERJ 1350): (a–c) Epimeral plates 1–3; (D–F) Uropods 1–3; (G) Telson. Scale bars: 0.5 mm for A–C; 0.2 mm for the remaining.
Figure 5 in A new ascidian-dwelling species of Leucothoe Leach, 1814 (Amphipoda: Leucothoidae) from Ilha Grande Bay, Rio de Janeiro state, Brazil
Figure 5. Leucothoe angraensis sp. nov. Female holotype (UERJ 1350): (a–e) Pereopods 3–7. Scale bars: 0.5 mm.
Figure 3 in A new ascidian-dwelling species of Leucothoe Leach, 1814 (Amphipoda: Leucothoidae) from Ilha Grande Bay, Rio de Janeiro state, Brazil
Figure 3. Leucothoe angraensis sp. nov. Female holotype (UERJ 1350): (a) Antenna 1; (b) Antenna 2; (c) Head in lateral view; (d) Head in dorsal view; (e) Left mandible; (f) Right mandible; (g) Maxilla 1; (h) Maxilla 2; (i) Maxilliped. Scale bars: 0.5 mm for C–D; 0.4 mm for A; 0.1 for G–H; 0.2 mm for the remaining.
Figure 4 in A new ascidian-dwelling species of Leucothoe Leach, 1814 (Amphipoda: Leucothoidae) from Ilha Grande Bay, Rio de Janeiro state, Brazil
Figure 4. Leucothoe angraensis sp. nov. Female holotype (UERJ 1350): (a–b) Gnathopods 1–2, medial view. Scale bars: 0.2 mm for A; 0.5 mm for B.
Data from: Lineage divergence, local adaptation across a biogeographic break, and artificial transport, shape the genetic structure in the ascidian Pyura chilensis
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Data from: Distribution and localised effects of the invasive ascidian Didemnum perlucidum (Monniot 1983) in an urban estuary
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Supplementary information provided with Murray et al.: Discovery of an Antarctic ascidian-associated uncultivated Verrucomicrobia with antimelanoma palmerolide biosynthetic potential
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Data from: Fine scale hierarchical genetic structure and kinship analysis of the ascidian Pyura chilensis in the southeastern Pacific
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Data from: Habitat niche breadth predicts invasiveness in solitary ascidians
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Data from: Deep sequencing of mixed total DNA without barcodes allows efficient assembly of highly plastic ascidian mitochondrial genomes
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Data from: The role of metalloproteases in fertilisation in the ascidian Ciona robusta
In the ascidian Ciona robusta (formerly C. intestinalis type A), the mechanism underlying sperm penetration through the egg investment remains unknown. We previously reported that proteins containing both an astacin metalloprotease domain and thrombospondin type 1 repeats are abundant in the sperm surface protein-enriched fraction of C. robusta. Here we investigated the involvement of those proteins in fertilisation. We refined the sequences of astacin metalloproteases, confirmed that five of them are present in the sperm, and labelled them as tunicate astacin and thrombospondin type 1 repeat-containing (Tast) proteins. Fertilisation of C. robusta eggs was potently inhibited by a metalloprotease inhibitor GM6001. The eggs cleaved normally when they were vitelline coat-free or the inhibitor was added after insemination. Furthermore, vitelline coat proteins were degraded after incubation with intact sperm. These results suggest that sperm metalloproteases are indispensable for fertilisation, probably owing to direct or indirect mediation of vitelline-coat digestion during sperm penetration. TALEN-mediated knockout of Tast genes and the presence of GM6001 impaired larval development at the metamorphic stage, suggesting that Tast gene products play a key role in late development.
Data from: Genome-wide gene-associated microsatellite markers for the model invasive ascidian, Ciona intestinalis species complex
The vase tunicate, Ciona intestinalis species complex, has become a good model for ecological and evolutionary studies, especially those focusing on microevolution associated with rapidly changing environments. However, genome-wide genetic markers are still lacking. Here we characterized a large set of genome-wide gene-associated microsatellite markers for C. intestinalis spA (= C. robusta). Bioinformatic analysis identified 4654 microsatellites from expressed sequence tags (ESTs), 2126 of which successfully assigned to chromosomes were selected for further analysis. Based on the distribution evenness on chromosomes, function annotation and suitability for primer design, we chose 545 candidate microsatellites for further characterization. After amplification validation and variation assessment, 218 loci were polymorphic in at least one of the two populations collected from the coast of Arenys de Mar, Spain (N = 24 - 48) and Cape Town, South Africa (N = 24 - 33). The number of alleles, observed heterozygosity and expected heterozygosity ranged from two to 11, 0 to 0.833 and 0.021 to 0.818, and from two to 10, 0 to 0.879 and 0.031 to 0.845 for the Spanish and African populations, respectively. When all microsatellites were tested for cross-species utility, only 60 loci (25.8%) could be successfully amplified and all loci were polymorphic in C. intestinalis spB. A high level of genome-wide polymorphism is likely responsible for the low transferability. The large set of microsatellite markers characterized here is expected to provide a useful genome-wide resource for ecological and evolutionary studies using C. intestinalis as a model.
FIGURE 3. Aplidium stellatum. A in Ascidians of the genus Aplidium collected on shallow hard-bottom reefs of coastal Georgia (Atlantic coast of N America, U. S. A.)
FIGURE 3. Aplidium stellatum. A—underwater; B—formalin preserved colony.
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International Brain Laboratory public data
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OpenNeuro
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