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Marginotruncana marginata


Classification: pf_mesozoic -> Globotruncanidae -> Marginotruncana -> Marginotruncana marginata
Sister taxa: M. angusticarenata, M. caronae, M. coronata, M. desioi, M. manaurensis, M. marginata, M. paraconcavata, M. pileoliformis, M. pseudolinneiana, M. renzi, M. schneegansi, M. sigali, M. sigmoconcavata, M. sinuosa, M. tarfayaensis, M. undulata, M. sp.,

Taxonomy

Citation: Marginotruncana marginata (Reuss, 1845)
Rank: Species
Basionym: Rosalina marginata
Synonyms: Globotruncana fresnoensis;  Thalmanninella wicheri; Dicarinella marginata;
Taxonomic discussion: Holotype images in E+M online catalogue not very good. [copied from Chronos database]

Type images:

Entries in the Catalog of original descriptions: Rosalina marginata, Globotruncana fresnoensis, Thalmanninella wicheri


Emended description: Test low trochospiral, biconvex; equatorial periphery slightly lobate; axial periphery angular, with two keels separated by a narrow peripheral band which sometimes does not truncate the globular profile of the chambers. Chambers inflated, petaloid, irregularly increasing in size as added on spiral side; trapezoidal, globular on umbilical side; 5-8 chambers in final whorl. On spiral side sutures oblique and depressed to slightly raised. On umbilical side sutures depressed appearing radial,but marked by a largely U-shaped sigmoidal rims. Umbilicus wide and deep. Aperture interiomarginal, extraumbilical-umbilical, with portici. [copied from Chronos database]

Geological Range:
Last occurrence (top): within D. asymetrica zone (84.19-86.71Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): within H. helvetica zone (92.56-93.52Ma, base in Turonian 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: Marginotruncana marginata, synonyms included - Globotruncana fresnoensis; Globotruncana marginata; Globotruncana verrucosa; Marginotruncana marginata; Thalmanninella wicheri; space-time plot :: Samples map :: Parent: Marginotruncana

    Character matrix

    test outline:Lobatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical-extraumbilical
    sp chamber shape:Petaloidcoiling axis:Lowperiphery:Double keelaperture border:Coalescing portici
    umb chbr shape:Trapezoidalumbilicus:Wideperiph margin shape:Subangularaccessory apertures:None
    spiral sutures:Raised beadedumb depth:Deepwall texture:Smoothshell porosity:
    umbilical or test sutures:Moderately depressedfinal-whorl chambers:5.0-8.0 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Reuss, A. E. (1845a). Die Versteinerungen der böhmischen Kreide-formation. E. Schweizebart, Stuttgart. 1-58. gs


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    Marginotruncana marginata compiled by the pforams@mikrotax project team viewed: 22-8-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110334 Go to Archive.is to create a permanent copy of this page - citation notes



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