pforams@mikrotax - Dicarinella concavata

Dicarinella concavata


Classification: pf_mesozoic -> Globotruncanidae -> Dicarinella -> Dicarinella concavata
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.

Taxonomy

Citation: Dicarinella concavata (Brotzen, 1934)
Rank: Species
Basionym: Rotalia concavata
Synonyms:

Type images:

Original description: Spiral side depressed and flat plate or bowl-shaped. It has a central disk, and the rim is bordered by an elevated beam. Umbilicus is on umbilical side large and deep. Chambers of the last whorl on the spiral side (six to seven) are similar to those of Rotalia elevata Brotzen, 1934 with only the ridge on the border missing. The umbilical side is like that of R. elevata, and is clearly related with this species.

Entries in the Catalog of original descriptions: Rotalia concavata, Globotruncana araratica, Globotruncana vridhachalensis, Globotruncana concavata cyrenaica

Geological Range:
Last occurrence (top): within D. asymetrica zone (84.19-86.71Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): at base of D. concavata zone (0% up, 89.9Ma, in Turonian stage). Data source: zonal marker (from Timescale Creator)

Plot of range and occurrence data:

Character matrix
test outline:Circularchamber arrangement:Trochospiraledge view:Planoconvexaperture:Umbilical-extraumbilical
sp chamber shape:Petaloidcoiling axis:Highperiphery:Double keelaperture border:Thick porticus
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Subangularaccessory apertures:None
spiral sutures:Raised beadedumb depth:Deepwall texture:-shell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:5.0-7.0 N.B. These characters are used for advanced search. N/A - not applicable

References:

Almogi-Labin, A., Reiss, Z & Caron, M. (1986). Senonian globotruncanidae from Israel. Eclogae Geologicae Helvetiae. 79(3): 849-895. gs V O

Brotzen, F. (1934). Foraminiferen aus dem Senon Palastinas. Zeitschrift des Deutschen Palastina-Vereins. 28-72. 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

Pessagno, E. A. (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontographica Americana. 5: 245-445. gs V O

Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. 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


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

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