Blow’s species Globigerina praebulloides has been used by many workers to represent forms resembling Globigerina bulloides and considered to be early representatives of the bulloides lineage. SEM images of the holotype of praebulloides reveal a bulloides-type wall texture (Plate 6.8, Figs. 4-6, Chapter 6, this volume), however, the morphology is of a globigerinellid, i.e. evolute coiling and an extraumbilical aperture, and it is regarded as a junior synonym of Globigerinella obesa Bolli, therefore invalidating the name. In contrast, the majority of forms identified as G. praebulloides have a lobulate bulloides test morphology but lack the bulloides-type wall texture, having instead a much lower pore density and a significantly larger pore diameter than in G. bulloides. These wall textures can be attributed to the ruber/sacculifer-type. Globoturborotalita pseudopraebulloides n. sp., described herein is designed to carry this praebulloides ‘ideotype’. Globigerina bulloides s.s. appears in the upper Oligocene (Chapter 6, this volume) and overlaps in range with G. pseudopraebulloides. The bulloides-type wall texture can be traced to the lower Oligocene Zone O1 showing that the two species have separate unrelated lineages (see Chapter 6, this volume for further discussion). [Spezzaferri et al. 2018]
Catalog entries: Globoturborotalita pseudopraebulloides
Type images:Distinguishing features:
Parent taxon (Globoturborotalita): Trochospiral test with a single, large, open umbilical aperture. Cancellate wall. 4-4½ chambers in final whorl
This taxon: Lobulate test with 4 rapidly enlarging chambers in final whorl, large open umbilicus, and umbilical aperture. Like G. occlusa but higher aperture and less embracing chambers
Morphology:
Wall type:
Size:
Character matrix
test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Concavo-convex | aperture: | Umbilical |
sp chamber shape: | Globular | coiling axis: | Low | periphery: | N/A | aperture border: | N/A |
umb chbr shape: | Globular | umbilicus: | Wide | periph margin shape: | Broadly rounded | accessory apertures: | None |
spiral sutures: | Weakly depressed | umb depth: | Deep | wall texture: | Cancellate | shell porosity: | Macroperforate: >2.5µm |
umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 4-4 | N.B. These characters are used for advanced search. N/A - not applicable |
Geographic distribution
Isotope paleobiology
Phylogenetic relations
Most likely ancestor: Globoturborotalita occlusa - at confidence level 3 (out of 5). Data source: Spezzaferri et al. 2018.
Geological Range:
Notes: Lower Oligocene Zone O2 to middle Miocene Zone M6 (Kennett and Srinivasan, 1983, Spezzaferri, 1994). [Spezzaferri et al. 2018]
Last occurrence (top): within M6 zone (14.24-15.10Ma, top in Langhian stage). Data source: Spezzaferri et al. 2018
First occurrence (base): within O2 zone (30.28-32.10Ma, base in Rupelian stage). Data source: Spezzaferri et al. 2018
Plot of occurrence data:
Primary source for this page: Spezzaferri et al. 2018 - Olig Atlas chap.8 p.260
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Globoturborotalita pseudopraebulloides compiled by the pforams@mikrotax project team viewed: 9-10-2024
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