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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: 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 range and occurrence data:

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Planoconvexaperture:Umbilical
sp chamber shape:Petaloidcoiling axis:Very lowperiphery:Double keelaperture border:N/A
umb chbr shape:Globularumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:N/A
spiral sutures:Moderately depressedumb depth:Deepwall texture:Mod. Pustuloseshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.0-4.5 N.B. These characters are used for advanced search. N/A - not applicable

References:

Bolli, H. M. (1957e). The genera Praeglobotruncana, Rotalipora, Globotruncana, and Abathomphalus in the Upper Cretaceous of Trinidad, B. W. I. In, Loeblich, A. R. , Jr. , Tappan, H. , Beckmann, J. P. , Bolli, H. M. , Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin. 215: 51-60. gs V O


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Gansserina repanda compiled by the pforams@mikrotax project team viewed: 5-12-2020

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Short stable page link: http://mikrotax.org/pforams/index.php?id=110113 Go to Archive.is to create a permanent copy of this page - citation notes



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