Taxonomy
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: | Lobate | chamber arrangement: | Trochospiral | edge view: | Concavo-convex | 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: | None |
spiral sutures: | Weakly depressed | umb depth: | Shallow | wall texture: | Finely pustulose | shell porosity: | Microperforate: <1µm |
umbilical or test sutures: | Moderately depressed | final-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 (89.75-92.51Ma, top in Turonian stage). Data source: [copied from Chronos database]
First occurrence (base): within M. schneegansi zone (89.75-92.51Ma, 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:
Falsotruncana maslakovae compiled by the pforams@mikrotax project team viewed: 10-11-2024
Short stable page link: https://mikrotax.org/pforams/index.php?id=110104 Go to Archive.is to create a permanent copy of this page - citation notes |
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