pforams@mikrotax - Pseudoguembelina costulata pforams@mikrotax - Pseudoguembelina costulata

Pseudoguembelina costulata


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

Taxonomy

Citation: Pseudoguembelina costulata (Cushman, 1938)
taxonomic rank: Species
Basionym: Guembelina costulata

Type images:

Original description: Test 1½-2 times as long as broad, rather rapidly taperipg, initial end often acute with a slight point, somewhat compressed, earlier portion with the periphery slightly keeled, later portion: slightly idented; chambers slightly inflated, mostly broader than high, last ones with the inner portion reduced in height; sutures in the early portion slightly limbate and little if at all depressed, later depressed and slightly curved; wall ornamented throughout with fine longitudinal costae, becoming somewhat·curved and nearly parallel to the periphery in the later part; aperture semi­ circular, with a slightly thickened lip.

Entries in the Catalog of original descriptions: Guembelina costulata

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:Moderately depressedumb depth:N/Awall texture:Coarsely costateshell porosity:Microperforate: <1µm
umbilical or test sutures:Moderately depressedfinal-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 (67.64-69.27Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. elevata zone (79.33-83.65Ma, base in Campanian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

References:

Cushman, J. A. (1938). Cretaceous species of Guembelina and related genera. Contributions from the Cushman Laboratory for Foraminiferal Research. 14: 2-28. 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 O


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Pseudoguembelina costulata compiled by the pforams@mikrotax project team viewed: 14-12-2024

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