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4 results for “Globorotalia”
Morphological cladogenesis and terminal dwarfing in extinct Late Miocene through Pliocene menardiform globorotalids: New complementary data to «Evolutionary prospection in the Neogene planktic foraminifer Globorotalia menardii and related forms from ODP Hole 925B (Céara Rise, western tropical Atlantic): evidence for gradual evolution superimposed by long distance dispersal ?, Swiss J. Palaeontology, 135:205-248»
<p>A complementary morphometric data set is provided to the study of Knappertsbusch (2016) about the shell evolution of menardiform globorotalids (Neogene planktic foraminifera) at ODP Hole 925B from Céara Rise in the the western tropical Atlantic. The new measurements confirm splitting of extinct <em>Globorotalia multicamerata</em> from the <em>G. menardii</em> stock via the intermediate form <em>G. limbata</em> between about 6 Ma to 5 Ma ago. After splitting both <em>G. limbata</em> and <em>G. multicamerata</em> show gradual divergence from <em>G. menardii</em> in several shell parameters illustrating morphological cladogenesis. Between 2.88 Ma and 2.59 Ma the same parameters show a concerted trend towards reduced values indicating pre-extinction dwarfing. A comparison with published literature data of Delta<sup>18</sup>O trends between species, that populated the mixed layer (<em>Globigerinoides sacculifer</em>) and the thermocline layer (<em>Neogloboquadrina dutertrei</em>) at this location during those times suggests, that both divergence and subsequent dwarfing trends were probably the results of changes in upper watermass stratification.</p> <p>The complementary data set is provided in six zipped archives APPENDIX A, B, C, D, E and F (zipped with free software 7-Zip 22.00 (x64), 2022-06-15 from 1999-2022 Igor Pawlow), together with a description of the data in file Report_925B_suppl_1.pdf.</p>
Fig. 5. Middle Miocene planktonic foraminifer Globorotalia preascitula plexus from ODP Site 747, Kerguelen Plateau. A–D in Planktonic foraminiferal response to Middle Miocene cooling in the Southern Ocean (ODP Site 747, Kerguelen Plateau)
Fig. 5. Middle Miocene planktonic foraminifer Globorotalia preascitula plexus from ODP Site 747, Kerguelen Plateau. A–D. Globorotalia praescitula: 7H−5, 8–10 cm (A); 7H−6, 98–100 cm (B); 8H−6, 88–90 cm (C); 9H−3, 148–150 cm (D). E–H. Globorotalia miozea: 8H−3, 40–42 cm (E); 8H−5 118–120 cm (F); 9H−3, 28–30 cm (G); 9H−4, 58–60 cm (H). I–L. Globorotalia sp.: 7H−5, 128–130 cm (I); 7H−6, 30–40 cm (J); 8H−3, 10–12 cm (K); 8H−6, 88–90 cm (L). In axial (A1–L1) and umbilical (A2–L2) views. All SEM images. Scale bars 100 µm. Stratigraphic position of pictures specimens is indicated on Fig. 3.
Fig. 4. Middle Miocene planktonic foraminifer Globorotalia zealandica plexus from ODP Site 747, Kerguelen Plateau. A–D in Planktonic foraminiferal response to Middle Miocene cooling in the Southern Ocean (ODP Site 747, Kerguelen Plateau)
Fig. 4. Middle Miocene planktonic foraminifer Globorotalia zealandica plexus from ODP Site 747, Kerguelen Plateau. A–D. Globorotalia amuria. Encrusted: 8H−1, 38–40 cm (A); 8H−6, 28–30 cm (C); 9H−3, 98–100 cm (D). Non−encrusted: 8H−3, 100–102 cm (B). E–H. Globorotalia cf. conica. Non−pustulose: 8H−2, 128–130 cm (E); 8H−6, 146.5–148.5 cm (F). Pustulose: 9H−1, 4–6 cm (G); 9H−4, 148–150 cm (H). A1–H1 axial view, A2–H2 umbilical view. All SEM images. Scale bars 100 µm. The stratigraphic position of pictured specimens is indicated on Fig. 3.
Globigerinoides ruber Mg/Ca-based sea surface and Globorotalia hirsuta Mg/Ca-based subsurface water temperature records during the onset of the Late Pliocene from IODP Site U1313
<p><strong>Data related to: Pang, X., Voelker, A. H. L., Lu, S., and Ding, X.: Distinct seasonal changes and precession forcing of surface and subsurface temperatures in the mid-latitudinal North Atlantic during the onset of the Late Pliocene, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2024-603, 2024.</strong></p>
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