Huber et al 2017 pl4-02.JPG
Huber et al 2017 pl4-02.JPGTaxonomy
holotype: F. douglasiOriginal 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
Character matrix
| test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Inequally biconvex | aperture: | Umbilical-extraumbilical |
| sp chamber shape: | Petaloid | coiling axis: | Low | periphery: | Double keel | aperture border: | Thin lip |
| umb chbr shape: | Trapezoidal | umbilicus: | Wide | periph margin shape: | Subangular | accessory apertures: | Relict |
| spiral sutures: | Moderately depressed | umb depth: | Shallow | wall texture: | Coarsely pustulose | shell porosity: | Finely Perforate: 1-2.5µm |
| umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 6-6.5 | N.B. These characters are used for advanced search. N/A - not applicable | |||
Geological Range:
Last occurrence (top): within M. schneegansi zone (89.75-92.51Ma, top in Turonian stage). Data source: [copied from Chronos database]
First occurrence (base): within H. helvetica zone (92.51-93.52Ma, 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. gsReferences:
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Falsotruncana douglasi compiled by the pforams@mikrotax project team viewed: 21-1-2025
Short stable page link: https://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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