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Muricohedbergella flandrini


Classification: pf_mesozoic -> Hedbergellidae -> Muricohedbergella -> Muricohedbergella flandrini
Sister taxa: M. almadenensis, M. angolae, M. astrepta, M. atlantica, M. blakensis, M. crassa, M. delrioensis, M. flandrini, M. hoelzli, M. holmdelensis, M. implicata, M. kyphoma, M. loetterli, M. monmouthensis, M. planispira, M. portsdownensis, M. praelibyca, M. rosebudensis, M. sliteri, M. wondersi, M. sp.,

Taxonomy

Citation: Muricohedbergella flandrini (Porthault, in Donze et al., 1970)
Rank: Species
Basionym: Hedbergella flandrini
Taxonomic discussion: Usually 5 chambered; distinguished from simplex by having forward projecting final chamber. [copied from Chronos database]

Type images:

Original description: DIAGNOSE : L'espèce se caractérise par son test fortement comprimé au contour lobé. Les loges, au nombre de 5 au dernier tour, sont assez allongées radialement et s'accroissent rapidement en taille. L'ombilic est très étroit et le profil presque symétrique.

DESCRIPTION : Enroulement trochospiralé comprenant environ 2 tours 1/2. Test faiblement biconvexe, nettement comprimé latéralement. Loges de forme ovale ou spatulée, au nombre de 5 au dernier tour, s'accroissant assez rapidement. Ouverture primaire intériomarginale ombilicale-extraombilicale-périphérique, bordée par une lévre assez marquée. Ombilic trés étroit. Sutures radiales et déprimées. L'angle de raccordement entre les faces dorsale et ventrale est assez aigu, mais il n'y a pas de caréne et le bord périphérique est arrondi, tout au plus souligné par une concentration de pustules.

Translation (from Chronos):
Diagnosis: The species is characterized by its strongly compressed test and its lobate outline. The chambers, numbering 5 in the last whorl, are radially elongate and increase rapidly in size. The umbilicus is very narrow and the profile almost symmetrical.

Description. Trochospiral mode of coiling, comprising about 2 whorls and a half. Weakly biconvex, clearly compressed. Chambers oval or spatulate in shape, numbering 5 in the last whorl, increasing quite rapidly in size. Primary aperture interiomarginal , umbilical-extraumbilical -peripheral in position, bordered by a fairly noticeable lip. Umbilicus very narrow. Sutures radial and depressed. The dorsal and ventral sides converge in an acute angle, but there is no keel and the peripheral edge is rounded, at best marked by a concentration of pustules.

Entries in the Catalog of original descriptions: Hedbergella flandrini

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: Muricohedbergella flandrini, synonyms included - Hedbergella flandrini;
  • space-time plot :: Samples map :: Parent: Muricohedbergella

    Character matrix

    test outline:Lobatechamber arrangement:Trochospiraledge view:-aperture:Umbilical-extraumbilical
    sp chamber shape:Elongatecoiling axis:Lowperiphery:-aperture border:Thin lip
    umb chbr shape:Elongateumbilicus:Narrowperiph margin shape:Moderately roundedaccessory apertures:Relict
    spiral sutures:Strongly depressedumb depth:Shallowwall texture:Finely pustuloseshell porosity:Finely Perforate: 1-2.5µm
    umbilical or test sutures:Strongly depressedfinal-whorl chambers:4.5-5.0 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

    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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    Muricohedbergella flandrini compiled by the pforams@mikrotax project team viewed: 9-12-2019

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    Short stable page link: http://mikrotax.org/pforams/index.php?id=110365 Go to Archive.is to create a permanent copy of this page - citation notes



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