Taxonomy
Original description: Test small, much compressed, broadest near the apertural end, initial end pointed, early portion with the chambers ar-ranged as in Virgulina, later chambers biserial; chambers fairly distinct, slightly inflated, increasing in height as added; suturesslightly depressed; wall ornamented with curved, slightlyoblique, longitudinal costac, those of separate chambers usually distinct from those of adjacent chambers except in the early portion where the costae may cover more than one chamber; aperture elongate oval.
Entries in the Catalog of original descriptions: Guembelina excolata, Textularia costata
Character matrix
test outline: | Subtriangular | chamber arrangement: | Biserial | edge view: | Compressed | aperture: | Interiomarginal |
sp chamber shape: | Subrectangular | coiling axis: | N/A | periphery: | N/A | aperture border: | Thin flange |
umb chbr shape: | Subrectangular | umbilicus: | N/A | periph margin shape: | Moderately rounded | accessory apertures: | Sutural |
spiral sutures: | Weakly depressed | umb depth: | N/A | wall texture: | Coarsely costate | shell porosity: | - |
umbilical or test sutures: | Weakly depressed | final-whorl chambers: | 2-2 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): within A. mayaroensis zone (67.3-69.18Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. havanensis zone (74-75.71Ma, base in Campanian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
Cushman, J. A. (1926c). Some foraminifera from the Mendez shale of Eastern Mexico. Contributions from the Cushman Laboratory for Foraminiferal Research. 2(1): 16-24. gs Nederbragt, A. J. (1991). Late Cretaceous biostratigraphy and development of Heterohelicidae (planktic foraminifera). Micropaleontology. 37: 329-372. gs Pessagno, E. A. (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontographica Americana. 5: 245-445. gs O Smith, C. C. & Pessagno, E. A. (1973). Planktonic foraminifera and stratigraphy of the Corsicana formation (Maestrichtian) North-central Texas. Cushman Foundation for Foraminiferal Research, Special Publication. 12: 1-67. gs OReferences:
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Pseudoguembelina excolata compiled by the pforams@mikrotax project team viewed: 29-11-2023
Short stables page link: https://mikrotax.org/pforams/index.php?id=110452 Go to Archive.is to create a permanent copy of this page - citation notes |
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