nmn

Muricohedbergella hoelzli


Classification: pf_mesozoic -> Hedbergellidae -> Muricohedbergella -> Muricohedbergella hoelzli
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 hoelzli (Hagn and Zeil, 1954)
Rank: Species
Basionym: Globigerina hoelzli

Type images:

Original description: Diagnose: Eine neue Art der Gattung Globigerina mit folgenden Besonder heiten: Gehäuse stark zusammengedrückt, fast scheibenförmig, Oberfläche mit zahlreichen kurzen Dornen befleckt.

Beschreibung: Gehäuse mittelgross, schwach bikonvex, auf beiden Seiten stark zusammengedrückt, fast scheibenförmig. Dorsalseite mit 2½-3 Umgängen, die inneren Umgänge schwach erhaben, der letzte Umgang stark abgeflacht. Ventralseite etwas stärker gewölbt als Dorsalseite. Peripherie stark gelappt, abgerundet. Kammern auf der Dorsalseite schwach gewölbt, rundlich, 6-7 im letzten Umgang; auf der Ventralseite stärker gewölbt, rundlich trapezoedrisch. Nähte auf der Dorsal seite gerade, radialgestellt, stark vertieft, ebenso auf der Ventralseite. Oberfläche der Kammern mit zahlreichen kurzen Dornen bedeckt; in der zweiten Hälfte des letzten Umgangs werden diese schwächer, die 2-3 letzten Kammern sintl fast glatt. Nabel massig weit, tief. Die Mündung ist nicht wahrzunehmen, da die letzte Kammer weggebrochen ist. 

Diagnosis: A new species of the genus Globigerina d'Orbigny with the following characteristics: Test distinctly compressed, nearly disk-shaped surface covered by numerous sharp spines.

Description: Test of medium size, nearly biconvex, distinctly compressed on both sides and nearly disk-shaped. Dorsal side with 2.5 to 3 whorls, inner one slightly raised, last volution strongly flattened. Ventral side somewhat more inflated than the dorsal one. Periphery strongly lobate, more or less rounded off. Chambers on dorsal side weakly arched more or less rounded, 6 or 7 in the last whorl, on ventral side more strongly arched, rounded-trapezoidal. Sutures of the dorsal side straight, radially disposed, distinctly depressed, as on the ventral side. Surface of chambers with numerous, short spines; in the second half of the last volution they are weakly developed, and the last two to three chambers are more or less smooth. Umbilicus is moderately wide, deep. The aperture is not recognizable because the last chamber is broken off. [translation from Chronos website]

Entries in the Catalog of original descriptions: Globigerina hoelzli

Geological Range:
Last occurrence (top): within M. schneegansi zone (89.91-92.56Ma, top in Turonian stage). Data source: [copied from Chronos database]
First occurrence (base): within W. archaeocretacea zone (93.52-94.03Ma, base in Cenomanian 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 hoelzli, synonyms included - Hedbergella hoelzli;
  • space-time plot :: Samples map :: Parent: Muricohedbergella

    Character matrix

    test outline:Lobatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical-extraumbilical
    sp chamber shape:Petaloidcoiling axis:Very lowperiphery:aperture border:Thin lip
    umb chbr shape:Trapezoidalumbilicus:Narrowperiph margin shape:Moderately roundedaccessory apertures:Relict
    spiral sutures:Moderately depressedumb depth:Shallowwall texture:Finely muricateshell porosity:Finely Perforate: 1-2.5µm
    umbilical or test sutures:Moderately depressedfinal-whorl chambers:5.0-7.5 N.B. These characters are used for advanced search. N/A - not applicable

    References:

    Hagn, G. & Zeil, W. (1954). Globotruncanen aus dem Ober-Cenoman und Unter-Turon der Bayrischen Alpen. Eclogae Geologicae Helvetiae. 47(1): 1-60. 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

    Robaszynski, F., Caron, M. & le Groupe de Travail Européen des Foraminifères Planctoniques (1979). Atlas des Foraminiféres Planctoniques du Crétace Moyen (Mer Boréale et Téthys). Cahiers de Micropaléontologie,. 1 & 2: 1-185. gs


    logo

    Muricohedbergella hoelzli compiled by the pforams@mikrotax project team viewed: 8-12-2019

    Taxon Search:
    Advanced Search

    Short stable page link: http://mikrotax.org/pforams/index.php?id=110366 Go to Archive.is to create a permanent copy of this page - citation notes



    Comments (0)

    No comments yet. Be the first!

    Add Comment

    * Required information
    1000
    Captcha Image
    Powered by Commentics