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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: 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 range and occurrence data:

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Petaloidcoiling axis:Lowperiphery:Double keelaperture border:Thin lip
umb chbr shape:Trapezoidalumbilicus:Wideperiph margin shape:Subangularaccessory apertures:Relict
spiral sutures:Moderately depressedumb depth:Shallowwall texture:Coarsely pustuloseshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:6.0-6.5 N.B. These characters are used for advanced search. N/A - not applicable

References:

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


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Falsotruncana douglasi compiled by the pforams@mikrotax project team viewed: 25-10-2020

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Short stable page link: http://mikrotax.org/pforams/index.php?id=110102 Go to Archive.is to create a permanent copy of this page - citation notes



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