pforams@mikrotax - Dicarinella asymetrica pforams@mikrotax - Dicarinella asymetrica

Dicarinella asymetrica


Classification: pf_mesozoic -> Globotruncanidae -> Dicarinella -> Dicarinella asymetrica
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 asymetrica (Sigal, 1952)
Taxonomic rank: species
Basionym: Globotruncana asymetrica
Synonyms:
Taxonomic discussion: SEM photo in "Atlas du Cretace Moyen" vol. 2-1979, pl. 51/fig. 1a-c. Topotypes (2) F6 0819 [copied from Chronos database]

Type images:

Original description: En même temps se développe une autre espèce caractéristique par sa profonde dissymétrie du test, Globotruncana asymetrica n. sp. (fig. 35) qui n'est pas sans présenter quelque analogie avec certains Rotalipora du Cénomanien (R. reicheli MORNOD par example).

Translated from French. A species characterized by a strong asymmetry of the test, displaying a degree of analogy with some Cenomanian Rotalipora (Rotalipora reicheli (Mornod) [Globotrucana (Rotalipora) reicheli], for example).

Entries in the Catalog of original descriptions: Globotruncana asymetrica, Globotruncana (Globotruncana) ventricosa carinata, Globotruncana fundiconulosa

Character matrix
test outline:Subcircularchamber arrangement:Trochospiraledge view:Planoconvexaperture:Umbilical-extraumbilical
sp chamber shape:Petaloidcoiling axis:Lowperiphery:Double keelaperture border:Thin porticus
umb chbr shape:Subrectangularumbilicus:Wideperiph margin shape:Subangularaccessory apertures:Intralaminal
spiral sutures:Raised beadedumb depth:Deepwall texture:Finely pustuloseshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:5-6.5 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): at top of D. asymetrica zone (100% up, 83.7Ma, in Santonian stage). Data source: zonal marker (from Timescale Creator)
First occurrence (base): at base of D. asymetrica zone (0% up, 85.6Ma, in Santonian stage). Data source: zonal marker (from Timescale Creator)

Plot of range and occurrence data:

References:

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

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

Sigal, J. (1952). Sigal, J. (1952). Apercu stratigraphique sur la micropaleontologie du Cretace. XIX Congr. géol. internat., Algers, Monographies Regionales. 1(26): 3-43. XIX Congr. géol. internat., Algers, Monographies Regionales. 1(26): 3-43. gs


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Dicarinella asymetrica compiled by the pforams@mikrotax project team viewed: 22-5-2025

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