pforams@mikrotax - Sigalia decoratissima

Sigalia decoratissima


Classification: pf_mesozoic -> Heterohelicidae -> Sigalia -> Sigalia decoratissima
Sister taxa: S. carpatica, S. decoratissima, S. deflaensis, S. rugocostata, S. sp.

Taxonomy

Citation: Sigalia decoratissima (De Klasz, 1953)
Rank: Species
Basionym: Ventilabrella decoratissima
Synonyms: Ventilabrella bipartita

Type images:

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.

Beschreibung : Die Kammern des Gehäuses sind anfangs zweizeilig, im späteren Stadium fächerförmig angeordnet. Die Zahl der zweizeiligen, länglichen Anfangskammern beträgt bis zu je 7-8 an beiden Seiten. Die gebogenen Suturen dieser Kammern sind mit erhabenen, in einer Reihe stehenden Knoten verziert, die quer zur Kammerscheidewand ein wenig in die Länge gezogen sind. Die Suturen der folgenden, fächerförmig verteilten Kammern zeigen nur wenig oder gar keine Körnelung. Unten werden diese Kammern durch die bogenförmigen oberen Teile der vorhergehenden Kammern abgeschnitten. Der biseriale Teil des Gehäuses erscheint in Seitenansicht infolge der starken Ornamentierung dicker als der adulte Teil mit den fächerförmig angeordneten Kammern.

Entries in the Catalog of original descriptions: Ventilabrella decoratissima, Ventilabrella bipartita


Emended description: Early part of the test biserial, followed by 2 or 3, but sometimes up to 6 sets of multiserial chambers. Early part of the test and sutures of later chambers beaded, surface in between smooth, with scattered medium sized pores. Last formed chambers or sets of chamberlets with imperforate rims along the outline at each side of the test; these become the beaded sutures after subsequent chambers are added. Apertures bordered by a rim. [copied from Chronos database]

Geological Range:
Last occurrence (top): within D. asymetrica zone (84.19-86.71Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): within D. asymetrica zone (84.19-86.71Ma, base in Coniacian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

Character matrix
test outline:Palmatechamber arrangement:Multiserialedge view:Compressedaperture:Multiple
sp chamber shape:Petaloidcoiling axis:N/Aperiphery:N/Aaperture border:Thin flange
umb chbr shape:Petaloidumbilicus:N/Aperiph margin shape:Subangularaccessory apertures:None
spiral sutures:Raised beadedumb depth:N/Awall texture:Smoothshell porosity:-
umbilical or test sutures:Raised beadedfinal-whorl chambers:2.0-6.0 N.B. These characters are used for advanced search. N/A - not applicable

References:

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 V O

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 V O

Nederbragt, A. J. (1991). Late Cretaceous biostratigraphy and development of Heterohelicidae (planktic foraminifera). Micropaleontology. 37: 329-372. gs


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Sigalia decoratissima compiled by the pforams@mikrotax project team viewed: 24-9-2021

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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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