Catalog entries: Globorotalia scitula gigantea
Type images:Distinguishing features:
Parent taxon (hirsuta lineage): G. scitula - juanai - margaritae - hirsuta lineage
This taxon: Like G. scitula but much larger (>0.5mm vs ca 0.3mm)
Aperture: Interiomarginal umbilical-extraumbilical low slit bordered by a pronounced lip [Aze 2011, based on Stewart 2003]
Diagnostic characters:
Morphology:
Wall type:
Character matrix
| test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Inequally biconvex | aperture: | Umbilical-extraumbilical |
| sp chamber shape: | Crescentic | coiling axis: | Low | periphery: | N/A | aperture border: | Thick lip |
| umb chbr shape: | Subtriangular | umbilicus: | Narrow | periph margin shape: | Narrowly rounded | accessory apertures: | None |
| spiral sutures: | Weakly depressed | umb depth: | Shallow | wall texture: | Smooth | shell porosity: | Macroperforate: >2.5µm |
| umbilical or test sutures: | Weakly depressed | final-whorl chambers: | 4-5 | N.B. These characters are used for advanced search. N/A - not applicable | |||
[SCOR WG138]
Geographic distribution
Isotope paleobiology
Most likely ancestor: Globorotalia scitula - at confidence level 3 (out of 5). Data source: Stewart 2003 fig. 6.10; Aze et al. 2011, appendix 5.
Geological Range:
Last occurrence (top): within M13a subzone (8.58-9.83Ma, top in Tortonian stage). Data source: Stewart 2003; Aze et al. 2011
First occurrence (base): within M7 zone (13.77-14.24Ma, base in Langhian stage). Data source: Stewart 2003; Aze et al. 2011
Plot of occurrence data:
Aze, T., et al. (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews. 86: 900-927. gs Blow, W. H. (1959). Age, correlation, and biostratigraphy of the upper Tocuyo (San Lorenzo) and Pozon Formations, eastern Falcon, Venezuela. Bulletins of American Paleontology. 39(178): 67-251. gs Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gs Stewart, D. R. M. I. (2003). Evolution of Neogene globorotaliid foraminifera and Miocene climate change. PhD thesis, Bristol University. 1-269. gs OReferences:

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Globorotalia gigantea compiled by the pforams@mikrotax project team viewed: 16-11-2025
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