holotype: G. repanda
holotype: G. repanda
holotype: G. repanda
Taxonomy
holotype: G. repanda
holotype: G. repanda
holotype: G. repandaOriginal 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: | Lobate | chamber arrangement: | Trochospiral | edge view: | Planoconvex | aperture: | Umbilical |
| sp chamber shape: | Petaloid | coiling axis: | Very low | periphery: | Double keel | aperture border: | N/A |
| umb chbr shape: | Globular | umbilicus: | Narrow | periph margin shape: | Subangular | accessory apertures: | N/A |
| spiral sutures: | Moderately depressed | umb depth: | Deep | wall texture: | Mod. Pustulose | shell porosity: | Finely Perforate: 1-2.5µm |
| umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 4.0-4.5 | N.B. These characters are used for advanced search. N/A - not applicable | |||
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 OReferences:
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Gansserina repanda compiled by the pforams@mikrotax project team viewed: 16-6-2021
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