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Gansserina repanda


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

Taxonomy

Citation: Gansserina repanda (Bolli, 1957)
Rank: Species
Basionym: Globotruncana repanda

Type images:

Original description: Globotruncana repanda Bolli 1957: Shape of test a very low trochospiral, spiral side concave, umbilical side strongly inflated; equatorial periphery lobate, early chambers of last whorl with double keel, which may be absent in the ultimate and penultimate chambers. Wall calcareous, perforate; surface in well-preserved specimens slightly rugose, especially on the umbilical side. Chambers globular to hemispherical, twelve to fifteen, arranged in two to three whorls; the four chambers of the last whorl increase rapidly in size, earlier whorls small by comparison. Sutures on spiral side almost radial, depressed; on umbilical side radial, depressed. Umbilicus deep, wide. Primary apertures interiomarginal, umbilical; tegillia with accessory apertures not preserved in Trinidad material, but present in specimens of this species from the Gulf Coast. The twenty-five specimens counted all coiled dextrally.

Entries in the Catalog of original descriptions: Globotruncana repanda;

Geological Range:
Last occurrence (top): within G. ventricosa zone (76.18-79.20Ma, top in Campanian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. elevata zone (79.20-84.19Ma, base in Santonian 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

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Planoconvexaperture:Umbilical
umb chamber shape:Globularcoiling axis:Very lowperiphery:Double keelaperture border:N/A
sp chbr shape:Petaloidumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:N/A
umbilical or test sutures:Moderately depressedumb depth:Deepwall texture:Mod. Pustuloseshell porosity:Finely Perforate: 1-2.5┬Ám
spiral sutures:Moderately depresseddiameter mm:0.33width mm:breadth mm:0.17
final-whorl chambers:4.0-4.5

References:

Bolli, H.M., (1957). The genera Praeglobotruncana, Rotalipora, Globotruncana, and Abathomphalus in the Upper Cretaceous of Trinidad, B. W. I. In: Loeblich, A.R., Jr. et al. (Editors), Studies in Foraminifera, U.S. National Museum Bulletin 215U.S. Government Printing Office, Washington, D.C., pp. 51-60.


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Gansserina repanda compiled by the pforams@mikrotax project team viewed: 24-2-2018

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