pforams@mikrotax - Marginotruncana tarfayaensis pforams@mikrotax - Marginotruncana tarfayaensis

Marginotruncana tarfayaensis


Classification: pf_mesozoic -> Globotruncanidae -> Marginotruncana -> Marginotruncana tarfayaensis
Sister taxa: M. angusticarenata, M. caronae, M. coronata, M. desioi, M. manaurensis, M. marginata, M. paraconcavata, M. pileoliformis, M. pseudolinneiana, M. renzi, M. schneegansi, M. sigali, M. sigmoconcavata, M. sinuosa, M. tarfayaensis, M. undulata, M. sp.

Taxonomy

Citation: Marginotruncana tarfayaensis (Lehmann, 1963)
Taxonomic rank: species
Basionym: Globotruncana tarfayaensis

Type images:

Original description: Translated from French: The test is slightly trochospiral, biconvex and with a weakly lobate periphery. About 20 chambers forming 3 whorls. Rapid increase in size for the 6 chambers of the last whorl. On the spiral side, the semicircular or angular sutures of the chambers meet the internal whorl obliquely; they are curved backwards. The last sutures have a tendency to become radial. Six to 7 reniform chambers visible on the umbilical side. The size of the wide umbilicus, is about a 1/3 of the diameter. The aperture is interiomarginal-umbilical in position. The double keel splits into two only toward the septal side.

Entries in the Catalog of original descriptions: Globotruncana tarfayaensis

Character matrix
test outline:Subcircularchamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Petaloidcoiling axis:Low-moderateperiphery:Double keelaperture border:Coalescing portici
umb chbr shape:Crescenticumbilicus:Wideperiph margin shape:Subangularaccessory apertures:
spiral sutures:Raised beadedumb depth:Shallowwall texture:Smoothshell porosity:Microperforate: <1µm
umbilical or test sutures:Raised beadedfinal-whorl chambers:6-7 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within D. asymetrica zone (83.65-85.60Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): within M. schneegansi zone (89.75-92.51Ma, base in Turonian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

References:

Lehmann, R. (1963). Étude des Globotruncanidés du Crétacé supérieur de la province de Tarfaya (Maroc occidental). Notes du Service Geologique du Maroc. 21(156): 133-179. gs


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Marginotruncana tarfayaensis compiled by the pforams@mikrotax project team viewed: 18-5-2026

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110344 Go to Archive.is to create a permanent copy of this page - citation notes



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