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Marginotruncana sinuosa


Classification: pf_mesozoic -> Globotruncanidae -> Marginotruncana -> Marginotruncana sinuosa
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 sinuosa Porthault, in Donze et al., 1970
Rank: Species
Basionym: Marginotruncana sinuosa

Type images:

Original description: DIAGNOSE : Cette espèce est morphologiquement très semblable à Globotruncana fornicata PLUMMER, mais elle s'en distingue par la position de l'ouverture primaire qui est ombilicale-extraombilicale et non franchement ombilicale.

DESCRIPTION : Test calcaire hyalin perforé bilamellaire g enroulement trochospiralé. Ouverture primaire ombilicale-extraombilicale. Forme biconvexe, la face dorsale étant gén6ralement plus convexe que la face ventrale. Bandeau carénal périphérique étroit, comportant deux carènes divergentes, étroitement accolées sur la partie postérieure des loges. Le plan de chacune des loges est décalé par rapport celui de ses voisines, ce qui donne g l'ensemble du test une allure contournée caractéristique. Cette disposition se traduit surtout par un aspect sinueux du bandeau carénat et par une ondutation de la surface du test sur Ia face spirale. Les loges sont très fortement étirées dans le sens de l'enroulement et prennent une allure imbriquée, nettement soulignée sur la face ventrale par le parcours sigmoide des bourrelets suturaux et périombilicaux. L'ombilic, relativement large, est en partie masqué par les expansions lamelleuses (<< tegilla >>) issues de la partie adombilicale de chacune des loges ; ces expansions ménagent entre elles des ouvertures accessoires infra et intralaminales.

Entries in the Catalog of original descriptions: Marginotruncana sinuosa


Emended description: Test moderately high trochospiral, somewhat asymmetrically biconvex. Primary aperture extraumbilical-umbilical. Two keels forming a sinuous outline, closely spaced on the posterior part of the chamber, diverging on the anterior part where they are separated by an imperforate peripheral band. Equatorial periphery subcircular. Chambers strongly elongated in the direction of coiling with a flat or undulated surface on spiral side; umbilical chambers imbricated and strongly elongated in the direction of coiling; 5-6 chambers in final whorl. On spiral side sutures curved, very oblique and raised. On umbilical side the sutures are raised, V-shaped and sigmoid with the sutural ridge continuing around the umbilical depressions. Umbilicus wide and deep surrounded or covered by 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 sinuosa, synonyms included - Contusotruncana fornicata manaurensis; Globotruncana fornicata manaurensis; Marginotruncana manaurensis; Marginotruncana sinuosa;
  • space-time plot :: Samples map :: Parent: Marginotruncana

    Character matrix

    test outline:Subcircularchamber arrangement:Trochospiraledge view:-aperture:-
    sp chamber shape:Crescenticcoiling axis:Moderate-highperiphery:Double keelaperture border:Coalescing portici
    umb chbr shape:Crescenticumbilicus:Wideperiph margin shape:Subangularaccessory apertures:None
    spiral sutures:Raised beadedumb depth:Deepwall texture:Smoothshell porosity:-
    umbilical or test sutures:Raised beadedfinal-whorl chambers:5.0-6.0 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Donze, P., Porthalult, B., Thomel, G. & de Villoutryeys, O. (1970). Le Senonien inferieur de Puget-Theniers (Alpes-Maritimes) et sa microfaune. Geobios. 3(2): 41-106. gs

    Gandolfi, R. (1955). The genus Globotruncana in northeastern Colombia. Bulletin of American Paleontology. 36: 1-118. 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


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    Marginotruncana sinuosa compiled by the pforams@mikrotax project team viewed: 22-10-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110342 Go to Archive.is to create a permanent copy of this page - citation notes



    Comments (1)

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    Le Coze

    Inversed priority

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    Jeremy Young (UK)

    another one for Brian's list

    Gravatar
    Brian Huber

    Globotruncana fornicata manaurensis moved out of sinuosa and now considered as a valid species of Marginotruncana.

    Page 1 of 1
     

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