pforams@mikrotax - Marginotruncana coronata pforams@mikrotax - Marginotruncana coronata

Marginotruncana coronata


Classification: pf_mesozoic -> Globotruncanidae -> Marginotruncana -> Marginotruncana coronata
Sister taxa: M. angusticarenata, M. caronae, M. coronata, M. desioi, M. manaurensis, M. marginata, M. paraconcavata, M. pileoliformis, M. pseudolinneiana, M. renzi, M. schneegansi, M. sigali, M. sigmoconcavata, M. sinuosa, M. tarfayaensis, M. undulata, M. sp.

Taxonomy

Citation: Marginotruncana coronata (Bolli, 1945)
Taxonomic rank: species
Basionym: Globotruncana lapparenti coronata

Type images:

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:
Translated from German: The test is usually large, 0.5-0.6 mm, larger than the "principal form" (main / original species?) and much compressed; the chambers are broad and flat. Especially on the outer chambers the two peripheral keels lie close together and even seem to merge to a single one, as observed in a few cases. The subspecies is identical to the "type 4, en couronne de feuilles" given by de Lapparent (1918). [copied from Chronos database]

Character matrix
test outline:Circularchamber arrangement:Trochospiraledge view:-aperture:-
sp chamber shape:Petaloidcoiling axis:Lowperiphery:-aperture border:-
umb chbr shape:Petaloidumbilicus:-periph margin shape:-accessory apertures:-
spiral sutures:Raised beadedumb depth:-wall texture:-shell porosity:-
umbilical or test sutures:Raised beadedfinal-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:

References:

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. gs


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Marginotruncana coronata compiled by the pforams@mikrotax project team viewed: 17-6-2025

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Comments (2)

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Thank you for good site.I saw new species in my study in Iran of the cretaceous. would you like see them?

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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