Taxonomy
Original description: Trochoidal, dorsal side convex, ventral side concave. Ventral side showing only the last formed whorl with 4-5 chambers. The chambers are rather compressed and each chamber is partly overlapped by the preceding one. The periphery has no keel. Umbilicus on the ventral side.
Entries in the Catalog of original descriptions: Globotruncana havanensis
Character matrix
test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Spiroconvex | aperture: | Umbilical-extraumbilical |
sp chamber shape: | Petaloid | coiling axis: | Low-moderate | periphery: | aperture border: | Thin porticus | |
umb chbr shape: | Petaloid | umbilicus: | Narrow | periph margin shape: | Subangular | accessory apertures: | Intralaminal |
spiral sutures: | Moderately depressed | umb depth: | Deep | wall texture: | Finely pustulose | shell porosity: | Finely Perforate: 1-2.5µm |
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 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:
Pessagno, E. A. (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontographica Americana. 5: 245-445. gs O Voorwijk, G. H. (1937). Foraminifera from the Upper Cretaceous of Habana, Cuba. Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen. 40: 190-198. gs References:
Globotruncanella havanensis compiled by the pforams@mikrotax project team viewed: 10-12-2024
Short stable page link: https://mikrotax.org/pforams/index.php?id=110181 Go to Archive.is to create a permanent copy of this page - citation notes |
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