nmn

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:Lobatechamber arrangement:Trochospiraledge view:inequally biconvexaperture:Umb.-extraumbilical
umb chamber shape:Trapezoidalcoiling axis:Lowperiphery:Double keelaperture border:Thin lip
sp chbr shape:Petaloidumbilicus:Wideperiph margin shape:Subangularaccessory apertures:Relict
umbilical or test sutures:Moderately depressedumb depth:Shallowwall texture:Coarsely pustuloseshell porosity:Finely Perforate: 1-2.5µm
spiral sutures:Moderately depresseddiameter 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.


logo

Falsotruncana douglasi compiled by the pforams@mikrotax project team viewed: 26-9-2017

Taxon Search:
Advanced Search
AphiaID: 901614 Nomenclatural data on WoRMS
Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet. Be the first!

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics