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Marginotruncana undulata


Classification: pf_mesozoic -> Globotruncanidae -> Marginotruncana -> Marginotruncana undulata
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 undulata (Lehmann, 1963)
Rank: Species
Basionym: Globotruncana undulata

Type images:

Entries in the Catalog of original descriptions: Globotruncana undulata


Emended description: Test trochospiral, biconvex slightly asymmetrical; equatorial periphery lobate; axial periphery angular, single keel formed by a double row of alternating pustules, becoming very closely spaced in the later part of the test. Chambers trapezoidal with an undulated surface on spiral side; trapezoidal becoming reniform on umbilical side; 5-7 chambers in final whorl. On spiral side sutures raised, forming a low angle with the preceding spiral suture. On umbilical side the sutures are V-shaped, raised and continuing along the umbilicus as periumbilical ridges. Umbilicus wide and shallow. 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 M. schneegansi zone (89.91-92.56Ma, 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 undulata, synonyms included - Marginotruncana undulata; space-time plot :: Samples map :: Parent: Marginotruncana

    Character matrix

    test outline:Lobatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
    sp chamber shape:Crescenticcoiling axis:Low-moderateperiphery:Single keelaperture border:Coalescing portici
    umb chbr shape:Petaloidumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:None
    spiral sutures:Raised beadedumb depth:Shallowwall texture:Smoothshell porosity:Microperforate: <1µm
    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:

    Lehmann, R. (1963). Étude des Globotruncanidés du Crétacé supérieur de la province de Tarfaya (Maroc occidental). Notes du Service Géologique du Maroc. 21(156): 133-179. gs


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    Marginotruncana undulata 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=110345 Go to Archive.is to create a permanent copy of this page - citation notes



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