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Gansserina wiedenmayeri


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

Taxonomy

Citation: Gansserina wiedenmayeri (Gandolfi, 1955)
Rank: Species
Basionym: Globotruncana wiedenmayeri
Synonyms: Globotruncana bahijae; Globotruncana wiedenmayeri magdalenaensis
Taxonomic discussion: Robaszynski et al., "Globotruncana gansseri dicarinata PESSAGNO, 1960, is put in synonymy with Globotruncana aegyptiaca, as already suggested by Pessagno, 1967." [copied from Chronos database]

Type images:

Original description: Globotruncana wiedenmayeri Gandolfi 1955:

Entries in the Catalog of original descriptions: Globotruncana bahijae;
Globotruncana wiedenmayeri;
Globotruncana wiedenmayeri magdalenaensis;


Emended description: Test flat on the dorsal side ith slightly inflated chambers (generally 6 in the last whorl), convex on the ventral side with chambers strongly inflated and round, 2 finely raised keels close to the dorsal side and to each other, chambers short, petaloid; sutures deeply depressed and radial on the ventral side, with sutural elevations occasionally present in the last chambers. Test rough with spines, papillae and rugose ridges on the ventral side, well developed arched lips (rosetta type) covering the umbilical apertures. Dimensions of holotype: Width 0.78 x 0.89 mm; thichness 0.32 mm [copied from Chronos database]

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): within G. falsostuarti (-Ma, base in stage). Data source: [copied from Chronos database]

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:Lobatecoiling axis:Very lowchamber arrangement:Trochospiralumbilicus:Wide
edge view:Planoconvexumbilical or test sutures:Moderately depressedspiral sutures:Raised beadedshell porosity:Finely Perforate: 1-2.5
wall texture:Coarsely pustuloseaperture:Umbilicalaperture border:Tegillaaccessory apertures:None
periphery:Double keelumb chamber shape:Trapezoidalsp chbr shape:Petaloidperiph margin shape:Subangular
umb depth:Deepdiameter mm:0.45 to 0.50 mmwidth mm:breadth mm:0.16-0.20
final-whorl chambers:5.0-8.0

References:

Gandolfi, R., (1955). The genus Globotruncana in northeastern Colombia. Bull. Am. Paleontol., 36: 1-118.


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Gansserina wiedenmayeri compiled by the pforams@mikrotax project team viewed: 23-7-2017

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