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Gansserina gansseri


Classification: pf_mesozoic -> Globotruncanidae -> Gansserina -> Gansserina gansseri
Sister taxa: G. gansseri, G. repanda, G. wiedenmayeri, G. sp.,

Taxonomy

Citation: Gansserina gansseri (Bolli, 1951)
Rank: Species
Basionym: Globotruncana gansseri
Synonyms: Globotruncana arabica; Globotruncana (Rugotruncana) gansseri dicarinata; Globotruncana gansseri gandolfii; Globotruncana lugeoni; Globotruncana qabeliatensis; Globotruncana gansseri subgansseri; Globotruncana youssefi

Type images:

Original description: Globotruncana gansseri Bolli 1951: "Test flat on dorsal side, ventrally strongly inflated. The chambers of the last whorl, usually five in number, surround a deep umbilicus. The suture lines on the dorsal side are curved and in many cases finely beaded. A distinct marginal keep separates the flat dorsal part from the inflated ventral side. Suture lines of the ventral side are slightly curved, indicating a slight overlapping of chambers. The wall, and particularly the ventral part of it, is somewhat rough or spiny."

Entries in the Catalog of original descriptions: Globotruncana (Rugotruncana) gansseri dicarinata;
Globotruncana arabica;
Globotruncana gansseri;
Globotruncana gansseri gandolfii;
Globotruncana gansseri subgansseri;
Globotruncana lugeoni;
Globotruncana qabeliatensis;
Globotruncana youssefi;

Geological Range:
Last occurrence (top): within A. mayaroensis zone (67.30-69.18Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): at base of G. gansseri zone (0% up, 73Ma, in Campanian stage). Data source: zonal marker (from Timescale Creator)

Plot of occurrence data:

NB Plotting of Neptune data has been disabled on the Mesozoic pages because the dataset is both small and badly affected by a few sites with erroneous age models (our obs Huber, Petrizzo, Young, Nov 2016). The data can still be viewed via the range plottertool - tools menu.

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:aperture:Umbilical
umb chamber shape:Trapezoidalcoiling axis:Very lowperiphery:Single keelaperture border:Thick porticus
sp chbr shape:Subtriangularumbilicus:Wideperiph margin shape:Subangularaccessory apertures:Infralaminal
umbilical or test sutures:Moderately depressedumb depth:Deepwall texture:Finely pustuloseshell porosity:
spiral sutures:Raised beadeddiameter mm:0.33 - 0.60width mm:breadth mm:0.17 - 0.40
final-whorl chambers:4.5-5.5

References:

Bolli, H.M., (1951). The genus Globotruncana in Trinidad. Journal of Paleontology, 25(2): 187-199.

Bolli, H.M., (1951). Notes on the direction of coiling of rotalid foraminifera. Contributions from the Cushman Foundation for Foraminiferal Research, 2(4): 139-143.


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Gansserina gansseri compiled by the pforams@mikrotax project team viewed: 19-11-2017

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