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Globotruncana orientalis


Classification: pf_mesozoic -> Globotruncanidae -> Globotruncana -> Globotruncana orientalis
Sister taxa: G. aegyptiaca, G. arca, G. bulloides, G. dupeublei, G. esnehensis, G. falsostuarti, G. hilli, G. lapparenti, G. linneiana, G. mariei, G. neotricarinata, G. orientalis, G. rosetta, G. rugosa, G. ventricosa, G. sp.,

Taxonomy

Citation: Globotruncana orientalis El Naggar 1966
Rank: Species
Basionym: Globotruncana orientalis
Synonyms:

Type images:

Original description: Test large, almost circular in outline, coiled in a relatively high trochospire; dorsal side broadly convex, ventral side flat although the chambers are very slightly inflated; equatorial periphery almost circular, slightly lobate; axial periphery angular, acute, with 2 heavily beaded keels on the early chambers of the last whorl, reduced to a single well-developed, distinctly beaded keel in the last chambers; chambers on the dorsal side arranged in 3 dextrally coiled whorls and slowly and regularly increasing in size; the initial chambers are small, inflated and elongated in the direction of coiling, the last whorl is composed of 6 large, typically crescentic chambers; on the ventral side of the chambers are 6, heavily beaded horseshoe-shaped rims, and increase so slowly in size that they thickened and heavily beaded; umbilicus roughly hexagonal in outline, wide, deep, surrounded by slightly raised, heavily beaded ridges, and covered by interiomarginal, umbilical; tegilla with accessory apertures only poorly preserved; wall calcareous, perforate, except for the imperforate keels.

Entries in the Catalog of original descriptions: Globotruncana orientalis, Globotruncana poststephensoni, Globotruncana samuriensis, Globotruncana stephensoni

Geological Range:
Last occurrence (top): within G. gansseri zone (71.75-72.97Ma, 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: Globotruncana orientalis, synonyms included - Globotruncana lakrai; Globotruncana orientalis; Globotruncana poststephensoni; Globotruncana samurensis; Globotruncana stephensoni; Marginotruncana stephensoni;
  • space-time plot :: Samples map :: Parent: Globotruncana

    Character matrix

    test outline:Subcircularchamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical
    sp chamber shape:Petaloidcoiling axis:Lowperiphery:Single keelaperture border:Tegilla
    umb chbr shape:-umbilicus:Wideperiph margin shape:Subangularaccessory apertures:-
    spiral sutures:Raised beadedumb depth:Deepwall texture:Finely pustuloseshell porosity:-
    umbilical or test sutures:Raised beadedfinal-whorl chambers:5.0-7.0 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Almogi-Labin, A., Reiss, Z & Caron, M. (1986). Senonian globotruncanidae from Israel. Eclogae Geologicae Helvetiae. 79(3): 849-895. gs

    El-Naggar, Z. R. (1966). Stratigraphy and planktonic foraminifera of the Upper Cretaceous-Lower Tertiary succession in the Esna-Idfu region, Nile Valley, Egypt, U. A. R. Bulletin of the British Museum (Natural History) Geology. supplement 2: 1-291. gs


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    Globotruncana orientalis compiled by the pforams@mikrotax project team viewed: 24-10-2019

    Taxon Search:
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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110169 Go to Archive.is to create a permanent copy of this page - citation notes



    Comments (1)

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    Le Coze

    Globotruncana lakrai was the first published

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    Jeremy Young (UK)

    true - another one for the list.

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    Brian Huber

    Globotruncana lakrai has been moved out from under schneegansi and is now considered a junior synonym of Globotruncana orientalis.

    Page 1 of 1
     

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