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29 results for “Rhizaria”
FIGURE 1. Reticulammina novaezelandica Tendal, 1972 in First record of a Xenophyophore (Rhizaria: Foraminifera) on the Chilean margin
FIGURE 1. Reticulammina novaezelandica Tendal, 1972 (MNHNCL PRO-15000). a–d, four views of entire specimen. e, detail showing the abraded surfaces of the lamellae separated by open spaces. f, specimen attached to rock. Scale is 10 mm for a–d and f, and 2 mm for e.
FIGURE 2 in New species of Leptohalysis (Rhizaria, Foraminifera) from an extreme hadal site in the western Pacific Ocean
FIGURE 2: Leptohalysis kaikoi sp. nov., scanning electron micrographs. A: Complete specimen. B; Proximal end showing organic-walled proloculus. C: Central part of test showing grains with flat exposed surfaces. D: Aperture. E: Patches of organic cement on grain surfaces. F–G: Outer surface showing agglutinated grains embedded in copious amounts of organic cement.
FIGURE 1 in New species of Leptohalysis (Rhizaria, Foraminifera) from an extreme hadal site in the western Pacific Ocean
FIGURE 1: Leptohalysis kaikoi sp. nov., photographs taken using transmitted light. A: Holotype, reg. no. MPC-02690. B–G: Paratypes, reg. nos MPC-02691-02696. H–P: Additional unregistered specimens. Scale bars = 50 µm.
FIGURE 3 in New species of Leptohalysis (Rhizaria, Foraminifera) from an extreme hadal site in the western Pacific Ocean
FIGURE 3: Leptohalysis sp. 1, scanning electron micrographs. A: Complete specimen. B: Proximal end showing organic-walled proloculus with some plate-like grains. C: Final chamber. D–E: Progressively closer views of final chamber showing mesh-like masses of organic cement and flake-like mineral grains. F: Central part of test. G: Close view showing cement and agglutinated grains.
FIGURE 4 in New species of Leptohalysis (Rhizaria, Foraminifera) from an extreme hadal site in the western Pacific Ocean
FIGURE 4: Leptohalysis sp. 2, photographed using transmitted light. Scale bar = 50 µm.
Sediment trap Rhizaria flux from sediment trap samples collected aboard CCE LTER process cruises in the California Current system, 2011 - present.
The collection and enumeration of sinking rhizarian cells on CCE LTER Process cruises has been led by Mike Stukel since 2007. Sinking particles are collected in VERTEX-style particle interceptor traps (PIT) with an 8:1 aspect ratio, 70-mm diameter, and a baffle on top comprised of 13 smaller beveled tubes with a similar 8:1 aspect ratio. Typically 8-12 tubes were deployed with a formalin-brine for a duration of 2-5 days. After recovery, samples were immediately gravity filtered through a 47-mm, 200-μm mesh nitex filter and analyzed under a stereomicroscope. The two dominant taxa of giant rhizaria (Aulosphaeridae and Castanellidae) were then enumerated in each sample. We note, however, that at least two distinct morphotypes of Aulosphaeridae were seen in the sample (but analyzed together because they had similar size and shape) and several smaller rhizarian taxa were also noticed, but not quantified because they are likely not quantitatively captured by our 200-μm filter. Mean and standard deviation of samples from different tubes are reported for each depth. For more details please see Stukel et al. (2013) or Biard et al. (submitted). Biard, T., J. W. Krause, M. R. Stukel and M. D. Ohman (submitted). "The significance of giant Phaeodarians (Rhizaria) to biogenic silica export in the California Current Ecosystem." Global Biogeochem. Cycles. Knauer, G. A., J. H. Martin and K. W. Bruland (1979). "Fluxes of particulate carbon, nitrogen, and phosphorus in the upper water column of the Northeast Pacific." Deep-Sea Research 26(1): 97-108. Stukel, M. R., M. D. Ohman, C. R. Benitez-Nelson and M. R. Landry (2013). "Contributions of mesozooplankton to vertical carbon export in a coastal upwelling system." Marine Ecology Progress Series 491: 47-65
FIGURE 2 in Checklist, assemblage composition, and biogeographic assessment of Recent benthic foraminifera (Protista, Rhizaria) from São Vincente, Cape Verdes
FIGURE 2. Species in common with source regions in the tropical to temperate North Atlantic. See Appendix Table 2 for references.
FIGURE 1 in Checklist, assemblage composition, and biogeographic assessment of Recent benthic foraminifera (Protista, Rhizaria) from São Vincente, Cape Verdes
FIGURE 1. Map with location of (a) the Cape Verde Archipelago and (b) sampling sites on São Vincente. CC: Canary Current, CUC: Canary Upwelling Current, CVC: Cape Verde Current, CVFZ: Cape Verde Frontal Zone, GD: Guinea Dome, NEC: North Equatorial Current, NECC: North Equatorial Counter Current (modified after Fiedler, 2012; Fernandes et al. 2015; Pelegrí & Peña-Izquierdo, 2015). Depth contours in (a) were given for the continental margin only. Colours and symbols in (b): light grey: volcanic or volcanoclastic rocks, yellow: sedimentary deposits (redrawn after Ancochea et al. 2010), orange: beach sands, dark grey and circles: urban areas and villages (after satellite images and observations during the geological excursion), arrows: sampling sites. The geographical coordinates are given in Appendix Table 1.
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