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Falsotruncana douglasi


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

Taxonomy

Citation: Falsotruncana douglasi Caron 1981
Rank: Species
Basionym: Falsotruncana douglasi

Type images:

Original description: Falsotruncana douglasi Caron 1981: Translated from French: Diagnosis: Transitional form, still closely related to Hedbergella hoelzli Hagn et Zeil, its ancestor. Chambers of the spiral side very pustulose and inflated. Two rows of thick pustules present on the edges of a narrow poreless carinal band, except for the two last chambers. All the other characteristics are as in the genus.

Entries in the Catalog of original descriptions: Falsotruncana douglasi;

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 H. helvetica zone (92.56-93.52Ma, base in Turonian stage). Data source: [copied from Chronos database]

Plot of occurrence data:

NB Plotting of Neptune data has been disabled on the Mesozoic pages because the dataset is both small and badly affected by a few sites with erroneous age models (our obs Huber, Petrizzo, Young, Nov 2016). The data can still be viewed via the range plottertool - tools menu.

Character matrix

test outline:Lobatecoiling axis:Lowchamber arrangement:Trochospiralumbilicus:Wide
edge view:inequally biconvexumbilical or test sutures:Moderately depressedspiral sutures:Moderately depressedshell porosity:Finely Perforate: 1-2.5
wall texture:Coarsely pustuloseaperture:Umb.-extraumbilicalaperture border:Thin lipaccessory apertures:Relict
periphery:Double keelumb chamber shape:Trapezoidalsp chbr shape:Petaloidperiph margin shape:Subangular
umb depth:Shallowdiameter mm:0.48width mm:breadth mm:0.18
final-whorl chambers:6.0-6.5

References:

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


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Falsotruncana douglasi compiled by the pforams@mikrotax project team viewed: 22-7-2017

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