pforams@mikrotax - Radotruncana calcarata pforams@mikrotax - Radotruncana calcarata

Radotruncana calcarata


Classification: pf_mesozoic -> Globotruncanidae -> Radotruncana -> Radotruncana calcarata
Sister taxa: R. calcarata, R. subspinosa, R. sp.

Taxonomy

Citation: Radotruncana calcarata (Cushman, 1927)
Taxonomic rank: species
Basionym: Globotruncana calcarata
Synonyms: Globotruncana calcarata arcata; Globotruncana calcarata primitiva; Globotruncana calcarata retardata

Type images:

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:Stellatechamber arrangement:Trochospiraledge view:Planoconvexaperture:Umbilical
sp chamber shape:Subtriangularcoiling axis:Very lowperiphery:Single keelaperture border:Thick porticus
umb chbr shape:Subrectangularumbilicus:Wideperiph margin shape:Subangularaccessory apertures:Infralaminal
spiral sutures:Raised beadedumb depth:Deepwall texture:Finely pustuloseshell porosity:
umbilical or test sutures:Moderately depressedfinal-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:

References:

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. gs


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Radotruncana calcarata compiled by the pforams@mikrotax project team viewed: 7-10-2026

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