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Dicarinella concavata


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

Taxonomy

Citation: Dicarinella concavata (Brotzen, 1934)
Rank: Species
Basionym: Rotalia concavata
Synonyms: Globotruncana araratica; Globotruncana vridhachalensis; Globotruncana concavata cyrenaica

Type images:

Original description: Rotalia concavata Brotzen 1934: 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: Globotruncana araratica;
Globotruncana concavata cyrenaica;
Globotruncana vridhachalensis;
Rotalia concavata;

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 occurrence data:

Dec 2017 - Plotting of Neptune data has been re-enabled on the Mesozoic pages following revision of the age-models in Neptune. The data is, however, still very sparse for the Early Cretaceous

Character matrix

test outline:Circularchamber arrangement:Trochospiraledge view:Planoconvexaperture:Umb.-extraumbilical
umb chamber shape:Globularcoiling axis:Highperiphery:Double keelaperture border:Thick porticus
sp chbr shape:Petaloidumbilicus:Wideperiph margin shape:Subangularaccessory apertures:None
umbilical or test sutures:Strongly depressedumb depth:Deepwall texture:Mod. Pustuloseshell porosity:Finely Perforate: 1-2.5µm
spiral sutures:Raised beadeddiameter mm:0.6 to 0.7width mm:breadth mm:0.2 to 0.3
final-whorl chambers:5.0-7.0

References:

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


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Dicarinella concavata compiled by the pforams@mikrotax project team viewed: 23-1-2018

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