nmn

Praeglobotruncana gibba


Classification: pf_mesozoic -> Hedbergellidae -> Praeglobotruncana -> Praeglobotruncana gibba
Sister taxa: P. algeriana, P. clotensis, P. compressa, P. delrioensis, P. gibba, P. hilalensis, P. inermis, P. kalaati, P. oraviensis, P. pseudoalgeriana, P. shirakinensis, P. stephani, P. sp.,

Taxonomy

Citation: Praeglobotruncana gibba (Klaus, 1960)
Rank: Species
Basionym: Praeglobotruncana stephani var. gibba
Synonyms: Globotruncana stephani turbinata

Type images:

Original description: Translated from French: The characters of this variety are those of the type species. However, the spire is higher, and the ratio of the height of the ventral convexity to the combined heights of the spire and ventral convexity is lower. We have not observed an increase in size for the specimens from level 56, we have not noticed the presence of a septal keel in the chambers of the last whorl, and the last chamber does not always feature a marginal keel. Because of the height of the spire in dorsal view, the outline seems less lobate since the dorsal side of the chambers meets the observer's eye obliquely. This variety (the differentiation of which remains a little subjective) represents nearly less than 15% of the Late Cenomanian Praeglobotruncana population (level 56 of the Breggia River section).

Entries in the Catalog of original descriptions: Praeglobotruncana stephani gibba, Globotruncana stephani turbinata

Geological Range:
Last occurrence (top): within H. helvetica zone (92.56-93.52Ma, top in Turonian stage). Data source: [copied from Chronos database]
First occurrence (base): within R. cushmani zone (94.03-95.94Ma, base in Cenomanian 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: Praeglobotruncana gibba, synonyms included - Globotruncana stephani turbinata; Praeglobotruncana gibba; Praeglobotruncana hilalensis; Praeglobotruncana turbinata;
  • space-time plot :: Samples map :: Parent: Praeglobotruncana

    Character matrix

    test outline:Subcircularchamber arrangement:Trochospiraledge view:Spiroconvexaperture:Umbilical-extraumbilical
    sp chamber shape:Petaloidcoiling axis:Moderate-highperiphery:Single keelaperture border:Thick porticus
    umb chbr shape:Subtriangularumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:N/A
    spiral sutures:Raised beadedumb depth:Deepwall texture:Finely pustuloseshell porosity:Finely Perforate: 1-2.5µm
    umbilical or test sutures:Moderately depressedfinal-whorl chambers:5.0-6.5 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Falzoni, F., Petrizzo, M. R., Jenkyns, H. C., Gale, A. S. & Tsikos, H. (2016). Planktonic foraminiferal biostratigraphy and assemblage composition across the Cenomanian–Turonian boundary interval at Clot Chevalier (Vocontian Basin, SE France). Cretaceous Research. 59: 69-97. gs :: ::

    Huber, B. T., Petrizzo, M. R., Watkins, D. K., Haynes, S. J. & MacLeod, K. G. (2017a). Correlation of Turonian continental margin and deep-sea sequences in the subtropical Indian Ocean sediments by integrated planktonic foraminiferal and calcareous nannofossil biostratigraphy. Newsletters on Stratigraphy. 50: 141-185. gs :: ::

    Klaus, J. (1960). Etude biometrique et statistique de quelques especes de Globotruncanides 1. Les especes du genre Praeglobotruncana dans le Cenomanien de la Breggia (Tessin, Suisse meridionale). Eclogae Geologicae Helvetiae. 53(1): 304-. gs :: ::

    Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. gs :: ::


    logo

    Praeglobotruncana gibba compiled by the pforams@mikrotax project team viewed: 8-7-2020

    Taxon Search:
    Advanced Search

    Short stable page link: http://mikrotax.org/pforams/index.php?id=110430 Go to Archive.is to create a permanent copy of this page - citation notes



    Comments (0)

    No comments yet on this page. Please do add comments if you spot any problems, or have information to share

    Add Comment

    * Required information
    1000
    Captcha Image
    Powered by Commentics