Taxonomy
Original description: Test trochoid, umbilicate, dorsal and ventral sides nearly parallel, the sides angled, obliquely truncate; chambers 4 or 5 in the final whorl, each with a stout peripheral spine, the early ones on the dorsal side oblique and marked by a bead-like ornamentation, ventrally radial, slightly depressed; aperture opening onto the umbilical region.
Entries in the Catalog of original descriptions: Globotruncana calcarata, Globotruncana calcarata arcata, Globotruncana calcarata primitiva, Globotruncana calcarata retardata
Character matrix
| test outline: | Stellate | chamber arrangement: | Trochospiral | edge view: | Planoconvex | aperture: | Umbilical |
| sp chamber shape: | Subtriangular | coiling axis: | Very low | periphery: | Single keel | aperture border: | Thick porticus |
| umb chbr shape: | Subrectangular | umbilicus: | Wide | periph margin shape: | Subangular | accessory apertures: | Infralaminal |
| spiral sutures: | Raised beaded | 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): at top of R. calcarata zone (100% up, 75.1Ma, in Campanian stage). Data source: zonal marker (from Timescale Creator)
First occurrence (base): at base of R. calcarata zone (0% up, 75.9Ma, in Campanian stage). Data source: zonal marker (from Timescale Creator)
Plot of range and occurrence data:
Almogi-Labin, A., Reiss, Z & Caron, M. (1986). Senonian globotruncanidae from Israel. Eclogae Geologicae Helvetiae. 79(3): 849-895. gs O Cushman, J. A. (1927b). New and interesting foraminifera from Mexico and Texas. Contributions from the Cushman Laboratory for Foraminiferal Research. 3(2): 111-119. gs Pessagno, E. A. (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontographica Americana. 5: 245-445. gs O Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. gsReferences:

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Radotruncana calcarata compiled by the pforams@mikrotax project team viewed: 7-10-2026
Short stable page link: https://mikrotax.org/pforams/index.php?id=110486 Go to Archive.is to create a permanent copy of this page - citation notes |
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