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Pseudoguembelina excolata


Classification: pf_mesozoic -> Heterohelicidae -> Pseudoguembelina -> Pseudoguembelina excolata
Sister taxa: P. costellifera, P. costulata, P. excolata, P. hariaensis, P. kempensis, P. palpebra, P. semicostata, P. sp.

Taxonomy

Citation: Pseudoguembelina excolata (Cushman, 1926)
Rank: Species
Basionym: Guembelina excolata
Synonyms: Textularia costata

Type images:

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

Geological Range:
Last occurrence (top): within A. mayaroensis zone (67.30-69.18Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. havanensis zone (74.00-75.71Ma, base in Campanian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

Character matrix

test outline:Subtriangularchamber arrangement:Biserialedge view:Compressedaperture:Interiomarginal
sp chamber shape:Subrectangularcoiling axis:N/Aperiphery:N/Aaperture border:Thin flange
umb chbr shape:Subrectangularumbilicus:N/Aperiph margin shape:Moderately roundedaccessory apertures:Sutural
spiral sutures:Weakly depressedumb depth:N/Awall texture:Coarsely costateshell porosity:-
umbilical or test sutures:Weakly depressedfinal-whorl chambers:2.0-2.0 N.B. These characters are used for advanced search. N/A - not applicable

References:

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 V O

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 V 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


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Pseudoguembelina excolata compiled by the pforams@mikrotax project team viewed: 23-1-2021

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Short stable page link: http://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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