pforams@mikrotax - Falsotruncana maslakovae pforams@mikrotax - Falsotruncana maslakovae

Falsotruncana maslakovae

Classification: pf_mesozoic -> Hedbergellidae -> Falsotruncana -> Falsotruncana maslakovae
Sister taxa: F. douglasi, F. loeblichae, F. maslakovae, F. sp.


Citation: Falsotruncana maslakovae Caron 1981
taxonomic rank: Species
Basionym: Falsotruncana maslakovae
Taxonomic discussion: The umbilicus is shallow and without portici or tegilla. [copied from Chronos database]

Type images:

Original description: Translated from French: Diagnosis: same features as those of the genus for which this form is the type species. Very low trochospiral test; the very flat profile is truncate even in the last chamber, lending the species its characteristic appearance. The poreless peripheral band reaches the last chamber (there, often perforate, cf. fig. 1d). The beaded double keel, not found in the last chamber, runs along the margins of the peripheral band in the remaining chambers.

Mêmes caractères que ceux du genre dont elle est l'espèce-type. Le test est une trochospire très basse: le profil très plat est tronqué même au niveau de la dernière loge, donnant son aspect caractéristique à l'espèce. Le bandeau périphérique imperforé atteint la dernière loge (sur celle-ci. il est souvent perforé, cf. pl. 2. 68 M. Caron fig. 1d). La double carène pustuleuse, qui le borde sur toutes les autres loges, ne se rencontre pas sur cette dernière loge.

Entries in the Catalog of original descriptions: Falsotruncana maslakovae

Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:Concavo-convexaperture:Umbilical-extraumbilical
sp chamber shape:Petaloidcoiling axis:Lowperiphery:Double keelaperture border:Thin lip
umb chbr shape:Trapezoidalumbilicus:Wideperiph margin shape:Subangularaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Shallowwall texture:Finely pustuloseshell porosity:Microperforate: <1µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:5.5-6.5 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within M. schneegansi zone (89.91-92.56Ma, top in Turonian stage). Data source: [copied from Chronos database]
First occurrence (base): within M. schneegansi zone (89.91-92.56Ma, base in Turonian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:


Caron, M. (1981). Un nouveau genre de Foraminifere planctonique du Cretace: Falsotruncana nov. gen. Eclogae Geologicae Helvetiae. 74(1): 65-73. 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


Falsotruncana maslakovae compiled by the pforams@mikrotax project team viewed: 4-12-2023

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