Taxonomy
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: | Subcircular | chamber arrangement: | Trochospiral | edge view: | Planoconvex | aperture: | Umbilical-extraumbilical |
sp chamber shape: | Petaloid | coiling axis: | Low | periphery: | Double keel | aperture border: | Thin porticus |
umb chbr shape: | Subrectangular | umbilicus: | Wide | periph margin shape: | Subangular | accessory apertures: | Intralaminal |
spiral sutures: | Raised beaded | umb depth: | Deep | wall texture: | Finely pustulose | shell porosity: | Finely Perforate: 1-2.5µm |
umbilical or test sutures: | Strongly depressed | final-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:
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. gsReferences:
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Dicarinella asymetrica compiled by the pforams@mikrotax project team viewed: 22-5-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=110084 Go to Archive.is to create a permanent copy of this page - citation notes |
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