Taxonomy
Original description: Test small trochospiral, relatively planiform both spirally and umbilically; consisting of 2.5 - 3 whorls of chambers which slowly expand in size; 5 chambers in last whorl. Chambers in early whorls and first several chambers of posterior part of final whorl spherical lacking double keel; remaining chambers forming anterior part of final whorl abruptly truncated peripherally by wide doulble keel of G. linneiana type; imperforate peripheral band or weak double keel developed in anterior, but not posterior portion of preceding whorl. Chambers petaloid in shape spirally; separated by curved, depressed to lightly elevated sutures which spirally; separated by curved, depressed to slightly elevated sutures which usually lack beads. Chambers umbilically subrectangular in shape; separated by depressed, slightly curved sutures. Test wall finely spinose throughout. Umbilicus wide and shallow, covered by tegilla with intralaminal and infralaminal accessory apertures. Primary aperture, interiomarginal, umbilical in position. Outer wall radial hyaline perforate except for fine spines and keel. Spines ultragranular hyaline. Keel radial hyaline imperforate; ultragranular hyaline outer portion of spiral and umbilical rims poorly developed. Tegilla and septal walls microgranular hyaline perforate.
Entries in the Catalog of original descriptions: Globotruncana hilli
Character matrix
test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Equally biconvex | aperture: | Umbilical |
sp chamber shape: | Petaloid | coiling axis: | Very low | periphery: | Double keel | aperture border: | Tegilla |
umb chbr shape: | Petaloid | 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: | Raised beaded | final-whorl chambers: | 4.5-5.5 | 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): near top of D. asymetrica zone (90% up, 83.8Ma, in Santonian stage). Data source: Coccioni and Premoli Silva, 2015
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 Coccioni, R. & Premoli Silva, I. (2015). Revised Upper Albian – Maastrichtian planktonic foraminiferal biostratigraphy and magneto-stratigraphy of the classical Tethyan Gubbio section (Italy). Newsletters on Stratigraphy. 48(1): 47-90. 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 OReferences:
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Globotruncana hilli compiled by the pforams@mikrotax project team viewed: 16-2-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=110161 Go to Archive.is to create a permanent copy of this page - citation notes |
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Comments (2)
Globotruncana hilli makes its appearance within the Santonian
The FAD has been corrected with citation of its occurrence in the Bottacione section according to Coccioni and Premoli Silva, 2015.