Taxonomy
Original description: This variety has the dorsal side more convex than the ventral in most specimens but some which are more or less equally biconvex obviously link it to the typical form. It is somewhat similar to G. conica White, but has fewer whorls and chambers and the sutures on the dorsal side are more curved. Some specimens which have a conspicuously large last chamber are very similar to G. convexa Sandidge, but they lack the secondary keel.
Entries in the Catalog of original descriptions: Globotruncana arca esnehensis, Globotruncana fareedi, Globotruncana sharawnaensis
Character matrix
test outline: | Circular | chamber arrangement: | Trochospiral | edge view: | Planoconvex | aperture: | - |
sp chamber shape: | Inflated | coiling axis: | Low | periphery: | Single keel | aperture border: | Tegilla |
umb chbr shape: | Inflated | umbilicus: | Narrow | periph margin shape: | Subangular | accessory apertures: | None |
spiral sutures: | Raised beaded | umb depth: | Shallow | wall texture: | Smooth | shell porosity: | Finely Perforate: 1-2.5µm |
umbilical or test sutures: | Weakly depressed | final-whorl chambers: | 5-6 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): at top of P. hariaensis zone (99% up, 66.4Ma, in Maastrichtian stage). Data source: Huber et al. 2022
First occurrence (base): at base of P. palpebra zone (0% up, 71.7Ma, in Maastrichtian stage). Data source: Huber et al. 2022
Plot of range and occurrence data:
Nakkady, S. E. (1950). A new foraminiferal fauna from the Esna shales and Upper Cretaceous chalk of Egypt. Journal of Paleontology. 24(6): 675-692. gs 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 esnehensis compiled by the pforams@mikrotax project team viewed: 16-2-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=110159 Go to Archive.is to create a permanent copy of this page - citation notes |
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