Taxonomy
Original description: "Test high conical with depressed umbilicus; periphery only slightly lobulated, marked by a limbate beaded keel and a secondary keel less strongly developed; chambers distinct, 5 making up the final whorl; early chambers globular, inflated, and tight-coiled, later ones flattened and not inflated; sutures distinct, depressed between the later chambers, curved and oblique on the dorsalside, radiating outward from the umbilicus on the ventral side; wall ornamented by coarse pustules over the initial chambers, later part of test finely spinose between the beaded sutures; aperture unobserved, presumably covered by the umbilical tegilla. Diameter 0.30-0.45 mm; height 0.25-0.32 mm."
Entries in the Catalog of original descriptions: Globotruncana walfischensis
Character matrix
| test outline: | Subcircular | chamber arrangement: | Trochospiral | edge view: | Spiroconvex | aperture: | Umbilical |
| sp chamber shape: | Crescentic | coiling axis: | High | periphery: | Double keel | aperture border: | Thin porticus |
| umb chbr shape: | - | umbilicus: | Wide | periph margin shape: | Subangular | accessory apertures: | Intralaminal |
| spiral sutures: | Moderately depressed | umb depth: | Deep | wall texture: | Finely pustulose | shell porosity: | - |
| umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 4-5 | N.B. These characters are used for advanced search. N/A - not applicable | |||
Geological Range:
Last occurrence (top): within P. hantkeninoides zone (66.04-66.39Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within R. fructicosa zone (69.27-70.14Ma, base in Maastrichtian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
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 Todd, R. (1970a). Maastrichtian (Late Cretaceous) foraminifera from a deep-sea core off southwestern Africa. Revista Española de Micropaleontología. 2(135-154): -. gs References:

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Contusotruncana walfischensis compiled by the pforams@mikrotax project team viewed: 11-9-2026
Short stable page link: https://mikrotax.org/pforams/index.php?id=110077 Go to Archive.is to create a permanent copy of this page - citation notes |
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