pforams@mikrotax - Dicarinella marianosi

Dicarinella marianosi

Classification: pf_mesozoic -> Globotruncanidae -> Dicarinella -> Dicarinella marianosi
Sister taxa: D. asymetrica, D. canaliculata, D. concavata, D. hagni, D. imbricata, D. marianosi, D. primitiva, D. roddai ⟩⟨ D. bouldinensis, D. longoriai, D. takayanagii, D. sp.


Citation: Dicarinella marianosi (Douglas, 1969)
Rank: Species
Basionym: Globotruncana marianosi

Taxonomic discussion:
At low latitudes, the range of M. marianosi is very short, being entirely within in the H. helvetica Zone, as reported by Douglas (1969) from the Californina sections, by Caron (1974) and Gonzalez Donoso & Linarez (1990) from the Tunisian sections, and by Bilotte et al. (1989) from the Pyrenees. At southern mid-high latitudes, in the Exmouth Plateau sections (Petrizzo, 2000) it appears slightly above the LO of F. maslakovae and disappears in the lowermost part of the D. asymetrica Zone. [copied from Chronos database]

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"

Type images:

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

Geological Range:
Last occurrence (top): within H. helvetica zone (92.56-93.52Ma, top in Turonian stage). Data source: [copied from Chronos database]
First occurrence (base): within H. helvetica zone (92.56-93.52Ma, base in Turonian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

Character matrix
test outline:Subcircularchamber arrangement:Trochospiraledge view:Planoconvexaperture:-
sp chamber shape:Petaloidcoiling axis:Lowperiphery:Single keelaperture border:Thick porticus
umb chbr shape:Trapezoidalumbilicus:Wideperiph margin shape:Subangularaccessory apertures:Infralaminal
spiral sutures:Raised beadedumb depth:Deepwall texture:Smoothshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:6.0-8.0 N.B. These characters are used for advanced search. N/A - not applicable


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. gs


Dicarinella marianosi compiled by the pforams@mikrotax project team viewed: 20-9-2021

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