Taxonomy
Original description: Das Gehäuse ist im allgemeinen gross, 0,5—0,6 mm, gegenüber der Stammform vergrössert und stark komprimiert; die Kammern sind breit und flach. Besonders bei den äussern Kammern liegen die beiden peripheren Kiele nahe beisammen und scheinen sich, wie in vereinzelten Fällen beobachtet wurde, sogar scheinbar zu einem einzigen zu vereinigen. Die Subspezies entspricht dem von de Lapparent (Lit. 71) gegebenen "type 4, en couronne de feuilles".
Entries in the Catalog of original descriptions: Globotruncana lapparenti coronata
Emended description:
Character matrix
test outline: | Circular | chamber arrangement: | Trochospiral | edge view: | - | aperture: | - |
sp chamber shape: | Petaloid | coiling axis: | Low | periphery: | - | aperture border: | - |
umb chbr shape: | Petaloid | umbilicus: | - | periph margin shape: | - | accessory apertures: | - |
spiral sutures: | Raised beaded | umb depth: | - | wall texture: | - | shell porosity: | - |
umbilical or test sutures: | Raised beaded | final-whorl chambers: | 6.5-7.5 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): within G. elevata zone (79.33-83.65Ma, top in Campanian stage). Data source: [copied from Chronos database]
First occurrence (base): within D. concavata zone (85.60-89.75Ma, base in Turonian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
Bolli, H. M. (1945). Bolli, H. M. (1945). Zur Stratigraphie der oberen Kreide in den höheren helvetischen Decken. Eclogae Geologicae Helvetiae. 37: 217-328. Eclogae Geologicae Helvetiae. 37: 217-328. gs O Pessagno, E. A. (1967). Pessagno, E. A. (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontographica Americana. 5: 245-445. Palaeontographica Americana. 5: 245-445. gs O Postuma, J. A. (1971). Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. Elsevier for Shell Group, The Hague. 1-406. gsReferences:
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Marginotruncana coronata compiled by the pforams@mikrotax project team viewed: 17-6-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=110332 Go to Archive.is to create a permanent copy of this page - citation notes |
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Comments (2)
Thank you for good site.I saw new species in my study in Iran of the cretaceous. would you like see them?
Reza
God to hear you are finding the site useful. Brian Huber is the expert on Certaceous planktonics so I have forwarded your query on new species to him.
best wishes
Jeremy Young