Taxonomy
Original description:
Translated using Google translate from German. Original text below
Diagnosis: A Ventilabrella with the following special feature: The chamber septa of the two-line initial stage are decorated with raised lumps.
Description: The chambers of the test are initially in two lines, fan-shaped in the later stage. The number of two-line, elongated initial chambers is up to 7-8 on each side. The curved sutures of these chambers are ornamented with raised lumps standing in a row, which are slightly elongated across the ventricular septum. The sutures of the following fan-shaped chambers show little or no granulation. Below these chambers are cut off by the arcuate upper parts of the preceding chambers. Due to the strong ornamentation of the biserial part of the test it appears thicker in side view, than the adult part with the arranged fan-shaped chambers.
Diagnose :Eine Ventilabrella mit folgender Besonderheit: Die Kammerscheidewände des zweizeiligen Anfangsstadiums sind mit erhabenen Knoten verziert.Entries in the Catalog of original descriptions: Ventilabrella decoratissima, Ventilabrella bipartita
Emended description:
Character matrix
test outline: | Palmate | chamber arrangement: | Multiserial | edge view: | Compressed | aperture: | Multiple |
sp chamber shape: | Petaloid | coiling axis: | N/A | periphery: | N/A | aperture border: | Thin flange |
umb chbr shape: | Petaloid | umbilicus: | N/A | periph margin shape: | Subangular | accessory apertures: | None |
spiral sutures: | Raised beaded | umb depth: | N/A | wall texture: | Smooth | shell porosity: | - |
umbilical or test sutures: | Raised beaded | final-whorl chambers: | 2-6 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): within D. asymetrica zone (83.65-85.60Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): within D. asymetrica zone (83.65-85.60Ma, base in Santonian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
de Klasz, I. (1953a). Einige neue oder wenig bekannte Foraminiferen aus der helvetischen Oberkreide der bayerischen Alpen, südlich Traunstein (Oberbayern). Geologica Bavarica. 17: 223-244. gs Honigstein, A., Almogi-Labin, A. & Rosenfeld, A. (1987). Combined ostracod and planktonic foraminiferal biozonation of the Late Coniacian - Early Maastrichtian in Israel. Journal of Micropalaeontology. 6(2): 41-60. gs Nederbragt, A. J. (1991). Late Cretaceous biostratigraphy and development of Heterohelicidae (planktic foraminifera). Micropaleontology. 37: 329-372. gsReferences:
Sigalia decoratissima compiled by the pforams@mikrotax project team viewed: 10-9-2024
Short stable page link: https://mikrotax.org/pforams/index.php?id=110531 Go to Archive.is to create a permanent copy of this page - citation notes |
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