Taxonomy
Transfered to Dicarinella by Huber et al. (2017, p178) "because of the absence of raised sigmoidal sutures, which Porthault considered a key feature for inclusion within Marginotruncana"
Original description: "Test free, large, low trochospiral with nearly flat spiral side, umbilicoconvex; equatorial periphery slightly lobate; axial periphery angular, with single keel. Chambers triarcuate and petaloid on spiral side; subrectangular to subtriangular, inflated on umbilical side; increasing rapidly in size, 6-8 in final whorl. Sutures curved, raised, beaded on spiral side; depressed, radial on umbilical side. Wall calcareous, perforate, radial in structure; surface smooth. Umbilicus wide and deep. Aperture interiomarginal, extraumbilical-umbilical, extending onto the margin with apertural flaps extending into the umbilical cavity."
Entries in the Catalog of original descriptions: Globotruncana marianosi, Dicarinella elata
Character matrix
test outline: | Subcircular | chamber arrangement: | Trochospiral | edge view: | Planoconvex | aperture: | - |
sp chamber shape: | Petaloid | coiling axis: | Low | periphery: | Single keel | aperture border: | Thick porticus |
umb chbr shape: | Trapezoidal | umbilicus: | Wide | periph margin shape: | Subangular | accessory apertures: | Infralaminal |
spiral sutures: | Raised beaded | umb depth: | Deep | wall texture: | Smooth | shell porosity: | Finely Perforate: 1-2.5µm |
umbilical or test sutures: | Strongly depressed | final-whorl chambers: | 6-8 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): within H. helvetica zone (92.51-93.52Ma, top in Turonian stage). Data source: [copied from Chronos database]
First occurrence (base): within H. helvetica zone (92.51-93.52Ma, base in Turonian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
Douglas, R. G. (1969). Upper Cretaceous planktonic foraminifera in northern California. Part 1 - Systematics. Micropaleontology. 15(2): 151-209. gs Huber, B. T., Petrizzo, M. R., Watkins, D. K., Haynes, S. J. & MacLeod, K. G. (2017a). 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. gs Robaszynski, F., Caron, M. & le Groupe de Travail Européen des Foraminifères Planctoniques (1979). Atlas des Foraminiféres Planctoniques du Crétace Moyen (Mer Boréale et Téthys). Cahiers de Micropaléontologie. 1 & 2: 1-185. gsReferences:
![]() |
Dicarinella marianosi compiled by the pforams@mikrotax project team viewed: 25-4-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=110093 Go to Archive.is to create a permanent copy of this page - citation notes |
This policy contains information about your privacy. By posting, you are declaring that you understand this policy:
This policy is subject to change at any time and without notice.
These terms and conditions contain rules about posting comments. By submitting a comment, you are declaring that you agree with these rules:
Failure to comply with these rules may result in being banned from submitting further comments.
These terms and conditions are subject to change at any time and without notice.
Comments