Taxonomy
Original description: Test low trochospiral, planoconvex, nearly flat on spiral side, convex on umbilical side, lobulate; chambers arranged in 2.5 to 3 whorls; chambers petaloid, slightly inflated on spiral side, subrectangular, convex most strongly around umbilicus, on umbilical side; final whorl consisting of 4.5 to 5 chambers increasing regularly in size as added, truncated by raised, beaded double keel; wall covered by pustulae except one or two terminal chambers that are smooth; sutures raised, curved; umbilicus broad, ordered by mildly elevated umbilical shoulder; primary aperture extraumbilical-umbilical; portici broken in material examined.
Entries in the Catalog of original descriptions: Marginotruncana caronae
Character matrix
test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Planoconvex | aperture: | |
sp chamber shape: | Petaloid | coiling axis: | periphery: | Double keel | aperture border: | ||
umb chbr shape: | umbilicus: | Wide | periph margin shape: | Narrowly rounded | accessory apertures: | ||
spiral sutures: | Raised beaded | umb depth: | Shallow | wall texture: | shell porosity: | Finely Perforate: 1-2.5µm | |
umbilical or test sutures: | Raised beaded | final-whorl chambers: | 4.5-5 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): within D. asymetrica zone (83.65-85.60Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): within M. schneegansi zone (89.75-92.51Ma, base in Turonian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
Falzoni, F., Petrizzo, M. R., Jenkyns, H. C., Gale, A. S. & Tsikos, H. (2016). Falzoni, F., Petrizzo, M. R., Jenkyns, H. C., Gale, A. S. & Tsikos, H. (2016). Planktonic foraminiferal biostratigraphy and assemblage composition across the Cenomanian-Turonian boundary interval at Clot Chevalier (Vocontian Basin, SE France). Cretaceous Research. 59: 69-97. Cretaceous Research. 59: 69-97. gs Huber, B. T., Petrizzo, M. R., Watkins, D. K., Haynes, S. J. & MacLeod, K. G. (2017a). Huber, B. T., Petrizzo, M. R., Watkins, D. K., Haynes, S. J. & MacLeod, K. G. (2017). Correlation of Turonian continental margin and deep-sea sequences in the subtropical Indian Ocean sediments by integrated planktonic foraminiferal and calcareous nannofossil biostratigraphy. Newsletters on Stratigraphy. 50: 141-185. Newsletters on Stratigraphy. 50: 141-185. gs Peryt, D. (1980). Peryt, D. (1980). Planktic foraminifera zonation of the Upper Cretaceous in the middle Vistula River valley, Poland. Palaeontologia Polonica. 41: 1-123. Palaeontologia Polonica. 41: 1-123. gsReferences:
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Marginotruncana caronae compiled by the pforams@mikrotax project team viewed: 12-5-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=110330 Go to Archive.is to create a permanent copy of this page - citation notes |
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