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764 results for “foraminifera”
FIG. 19. — A-D in The species of Lageninae Brady, 1881 (Foraminifera) from the Pliocene-Early Pleistocene of north-western France, Fécamp (Seine-Maritime, France) and St Erth (Cornwall, United Kingdom)
FIG. 19. — A-D, Lagena sp. A, Auxais (MNHN.F.F67684):A, lateral view;B, perforated wall;C, D, oral and basal views;E-G, Lagena sp. B, Fécamp (MNHN.F.F67685), lateral, oral and basal views; H-M, Lagena sp. C: H-J, la Sautré (MNHN.F.F67686) in lateral, oral and basal views; K-M, Mernel (MNHN.F.F67687) in lateral, oral and basal views; N-P, Lagunculella grayi n. gen., n. sp., Brest-LRK2, holotype (MNHN.F.F67688): N, lateral view; O, perforated wall; P, oral view. Scale bars: A, E, H, 200 µm; B, 5 µm; C, D, F, G, I-N, 100 µm; P, 50 µm; O, 20 µm.
FIG. 12. — A-H, Lagena buchneri n in The species of Lageninae Brady, 1881 (Foraminifera) from the Pliocene-Early Pleistocene of north-western France, Fécamp (Seine-Maritime, France) and St Erth (Cornwall, United Kingdom)
FIG. 12. — A-H, Lagena buchneri n. sp., Brest-LRK2: A-D, holotype (MNHN.F.F67651); A, lateral view; B, pores; C, D, oral and basal views; E-H, paratype (MNHN.F.F67652); E, lateral view; F, enlargement basal view; G, H, oral and basal views; I-O, Lagena digitale Heron-Allen & Earland, 1932: I-L, la Chênelière (MNHN.F.F67653); I, lateral view; J, pores; K, L, oral and basal views; M-O, l'Épinay (MNHN.F.F67654); M, lateral view; N, pores; O, oral view. Scale bars: A, E, I, M, 200 µm; B, J, 2 µm; C, D, G, H, K, L, O, 100 µm; F, 20 µm; N, 10 µm.
Data from: Evolutionary ecology of Early Paleocene planktonic foraminifera: size, depth habitat and symbiosis
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Data from: Nomenclature for the nameless: a proposal for an integrative molecular taxonomy of cryptic diversity exemplified by planktonic foraminifera
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Data from: A geographic test of species selection using planktonic foraminifera during the Cretaceous/Paleogene mass extinction
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Data from: Sampling bias and the fossil record of planktonic foraminifera on land and in the deep sea
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Data from: Mosaic evolution in the middle Miocene planktonic foraminifera Fohsella lineage
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Data from: Ocean acidification induces biochemical and morphological changes in the calcification process of large benthic foraminifera
Large benthic foraminifera are significant contributors to sediment formation on coral reefs, yet they are vulnerable to ocean acidification. Here, we assessed the biochemical and morphological impacts of acidification on the calcification of Amphistegina lessonii and Marginopora vertebralis exposed to different pH conditions. We measured growth rates (surface area and buoyant weight) and Ca-ATPase and Mg-ATPase activities and calculated shell density using micro-computer tomography images. In A. lessonii, we detected a significant decrease in buoyant weight, a reduction in the density of inner skeletal chambers, and an increase of Ca-ATPase and Mg-ATPase activities at pH 7.6 when compared with ambient conditions of pH 8.1. By contrast, M. vertebralis showed an inhibition in Mg-ATPase activity under lowered pH, with growth rate and skeletal density remaining constant. While M. vertebralis is considered to be more sensitive than A. lessonii owing to its high-Mg-calcite skeleton, it appears to be less affected by changes in pH, based on the parameters assessed in this study. We suggest difference in biochemical pathways of calcification as the main factor influencing response to changes in pH levels, and that A. lessonii and M. vertebralis have the ability to regulate biochemical functions to cope with short-term increases in acidity.
FIGURE 7 in Eocene planktonic foraminifera from the north Eastern Desert, Egypt: Biostratigraphic, paleoenvironmental and sequence stratigraphy implications
FIGURE 7 (caption on next page).
FIGURE 4 in Eocene planktonic foraminifera from the north Eastern Desert, Egypt: Biostratigraphic, paleoenvironmental and sequence stratigraphy implications
FIGURE 4. Range chart of the identified planktonic foraminifera at section B.
FIGURE 6 in Eocene planktonic foraminifera from the north Eastern Desert, Egypt: Biostratigraphic, paleoenvironmental and sequence stratigraphy implications
FIGURE 6 (caption on next page).
Fig. 1 in Orbitolinid Foraminifera From The Late Maastrichtian Of The Tarbur Formation (Zagros Zone, Sw Iran)
Fig. 1 Location map of the two studied sections.
Fig. 3 in Coskinolina Sistanensis N. Sp., A New Larger Benthic Foraminifera From The Early Eocene Of Eastern Iran
Fig. 3 Log of the Chenesht section with distribution of larger benthic foraminifera.
Fig. 1 in The foraminifera associated with the alga Gelidium pristoides, South Africa
Fig. 1. Map illustrating the rocky shores sampled around South Africa.
Data from: Ocean acidification induces biochemical and morphological changes in the calcification process of large benthic foraminifera
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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.
FIGURE 5 in Study of marsh foraminifera from the coastal plain of Buenos Aires (Argentina) and its ecological implications
FIGURE 5. Proportions of specimens from taphonomic analysis categorized according to one of three preservation groups for each station: A) well preserved shells, lacking at the most the last chambers; B) "black" shells with chamber fillings and/or with a polished coating in shades of black and dark brown and C) broken and fractured shells; elevation and type of sediment (% sand and clay).
FIGURE 2.a in Study of marsh foraminifera from the coastal plain of Buenos Aires (Argentina) and its ecological implications
FIGURE 2.a. Distribution of Hyaline (H), Porcelanaceus (P) and Agglutinated (A) individuals for each sample, and b.Plot of abundance and diversity parameters: species number (S) and Shannon-Wiener (H), Dominance (D) and individuals/ 10 grams of sediment (A).
FIGURE 4. a in Study of marsh foraminifera from the coastal plain of Buenos Aires (Argentina) and its ecological implications
FIGURE 4. a. Microhabitat: Epifauna (E), Epifaunal-Infaunal (E–I) and Infaunal (I). b. the most representative species of the foraminiferal assemblages.
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Allen Brain Atlas
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