pforams@mikrotax - Pseudoguembelina semicostata

Pseudoguembelina semicostata


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

Taxonomy

Citation: Pseudoguembelina semicostata (Cushman, 1938)
Rank: Species
Basionym: Guembelina semicostata Cushman, 1938
Synonyms:

Type images:

Original description: Test about 1½ times as long as broad, compressed, gradually tapering, less rapidly in the later portion, early portion slightly keeled, later portion with the periphery slightly indentate, initial end acute; chambers with the faces flattened but broadly rounded at the periphery, broader than high throughout; sutures broadly limbate, slightly if at all depressed, curved; wall in the middle and inner portions smooth, rounded, arched opening with a thickened, rounded lip.

Entries in the Catalog of original descriptions: Guembelina semicostata


Emended description:


Morphology:

Wall type:

Size:

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:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:N/Awall texture:Coarsely costateshell porosity:-
umbilical or test sutures:Moderately depressedfinal-whorl chambers:2.0-2.0 N.B. These characters are used for advanced search. N/A - not applicable

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. gansseri zone (71.75-72.97Ma, 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 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


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Pseudoguembelina semicostata compiled by the pforams@mikrotax project team viewed: 28-9-2022

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110457 Go to Archive.is to create a permanent copy of this page - citation notes



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