pforams@mikrotax - Gansserina wiedenmayeri pforams@mikrotax - Gansserina wiedenmayeri

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)
taxonomic 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: Test flat on the dorsal side with slightly inflatedchambers (generally six in the last whorl) convex on the ventralside with chambers strongly inflated and round, two finely raisedkeels close to the dorsal side and to each other, chambers short, petaloid; sutures, deep depressed, and radial on the ventral sidewith sutural elevations occasionally present m the last chambers. Test rough with spines, papillae, rugose ridges on the ventral side,developed arched lips (rosetta type) covering the umbilical aper-tures.

Entries in the Catalog of original descriptions: Globotruncana wiedenmayeri, Globotruncana bahijae, 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]

Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:Planoconvexaperture:Umbilical
sp chamber shape:Petaloidcoiling axis:Very lowperiphery:Double keelaperture border:Tegilla
umb chbr shape:Trapezoidalumbilicus:Wideperiph margin shape:Subangularaccessory apertures:None
spiral sutures:Raised beadedumb depth:Deepwall texture:Coarsely pustuloseshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:5-8 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): near top of P. hariaensis zone (90% up, 66.5Ma, in Maastrichtian stage). Data source: Huber et al. 2022
First occurrence (base): in lower part of P. palpebra zone (20% up, 71.4Ma, in Maastrichtian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

References:

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

Huber, B. T., Tur, N., Self-Trail, J. & MacLeod, K. G. (2022a). Calcareous plankton biostratigraphic fidelity and species richness during the last 10 m.y. of the Cretaceous at Blake Plateau, subtropical North Atlantic. Cretaceous Research. 131: 1-42. gs

Robaszynski, F., Caron, M., Gonzales Donoso, J. M., Wonders, A. A. H. & the European Working Group on Planktonic Foraminifera (1984). Atlas of Late Cretaceous globotruncanids. Revue de Micropaléontologie. 26(3-4): 145-305. gs


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Gansserina wiedenmayeri compiled by the pforams@mikrotax project team viewed: 25-5-2024

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