nmn

Pseudoguembelina costulata


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

Taxonomy

Citation: Pseudoguembelina costulata (Cushman, 1938)
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

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. elevata zone (79.20-84.19Ma, base in Santonian stage). Data source: [copied from Chronos database]

Plot of occurrence data:

Dec 2017 - Plotting of Neptune data has been re-enabled on the Mesozoic pages following revision of the age-models in Neptune. The data is, however, still very sparse for the Early Cretaceous

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Pseudoguembelina costulata, synonyms included - Pseudoguembelina costulata;
  • space-time plot :: Samples map :: Parent: Pseudoguembelina

    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:2.0-2.0 N.B. These characters are used for advanced search. N/A - not applicable

    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

    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


    logo

    Pseudoguembelina costulata compiled by the pforams@mikrotax project team viewed: 22-10-2019

    Taxon Search:
    Advanced Search

    Short stable page link: http://mikrotax.org/pforams/index.php?id=110451 Go to Archive.is to create a permanent copy of this page - citation notes



    Comments (0)

    No comments yet. Be the first!

    Add Comment

    * Required information
    1000
    Captcha Image
    Powered by Commentics