Taxonomy
Original description: Test coiled, flattened to slightly convex with surface of chambers flattened seldom inflated, but occasionally resting at an angle to the dorsal plane causing the anterior margin of each to be slightly raised; sutures sweep from the center and roundly curve on the periphery giving a subpetaloid appearance, are distinctly marked, slightly broadened and frequently ornamented by tubercles which are coarser toward the center. Their periphery, formed by the extremity of the sutures, is scalloped or lobed, subcarinate and ornamented by fine excrescenses. The ventral side is convex to protruded with usually only one whorl visible, and the chambers on this side are somewhat inflated with sutures marked by line of depression sometimes curving and extending from the periphery to the broad umbilicus. Umbilical margin of the chambers is marked on each by an extended lip; apertures open from the chambers in the final whorl into the receding umbilical vestibule; shell very finely perforate. The width of the shell varies from .3 mm - .7 mm, but the size is usually intermediate. Variations noted in the structure of this shell lead to the belief that if this one type were given extensive study several varieties of the species might be determined to good advantages.
Entries in the Catalog of original descriptions: Globigerina rosetta, Globotruncana lamellosa, Globotruncana mexicana, Globotruncana pseudofornicata, Globotruncana caliciformis sarmientoi, Globotruncana caliciformis trinidadensis
Character matrix
test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | - | aperture: | Umbilical |
sp chamber shape: | Petaloid | coiling axis: | Low-moderate | periphery: | Single to double keel | aperture border: | Tegilla |
umb chbr shape: | Trapezoidal | umbilicus: | Wide | periph margin shape: | Subangular | accessory apertures: | Intralaminal |
spiral sutures: | Raised beaded | umb depth: | Deep | wall texture: | Finely pustulose | shell porosity: | - |
umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 4-6 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): within A. mayaroensis zone (67.64-69.27Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. ventricosa zone (76.18-79.20Ma, base in Campanian stage). Data source: [copied from Chronos database]
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 Carsey, D. O. (1926). Foraminifera of the Cretaceous of central Texas. University of Texas Bulletin. 2612: 1-56. gs Esker, G. C. (1968b). Designation of a lectotype of Globotruncana rosetta (Carsey). Contributions from the Cushman Foundation for Foraminiferal Research. 19(4): 170-171. gs Huber, B. T., Tur, N., Self-Trail, J. & MacLeod, K. G. (2022a). Calcareous plankton biostratigraphic fidelity and species richness during the last 10 m.y. of the Cretaceous at Blake Plateau, subtropical North Atlantic. Cretaceous Research. 131: 1-42. gs Pessagno, E. A. (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontographica Americana. 5: 245-445. gs O 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. gsReferences:
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Globotruncana rosetta compiled by the pforams@mikrotax project team viewed: 16-2-2025
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