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Thalmanninella brotzeni


Classification: pf_mesozoic -> Rotaliporidae -> Thalmanninella -> Thalmanninella brotzeni
Sister taxa: T. appenninica, T. balernaensis, T. brotzeni, T. deeckei, T. evoluta, T. gandolfii, T. globotruncanoides, T. greenhornensis, T. micheli, T. praebalernaensis, T. reicheli, T. sp.

Taxonomy

Citation: Thalmanninella brotzeni Sigal 1948
Rank: Species
Basionym: Thalmanninella brotzeni
Taxonomic discussion: The main aperture in extraumbilical to umbilical (Robaszynski and Caron, 1979) and not umbilical as originally described. The porticus of the main aperture may occasionally be perforate (see Lipson-Benitah et al., 1997). R. brotzeni and R. globotruncanoides are similar but not synonymous. The former species has a more inflated profile. In the latter species, the last-formed accessory aperture becomes sutural in position. R. brotzeni also differs from R. globotruncanoides in having less petaloid chamber on the spiral side, for its smaller size, and in possesssing a more biconvex profile.
[copied from Chronos database]

Type images:

Original description: Translated from French: "...diagnosis, differences, geographic and stratigraphic distribution of the species are the same of the genus (Thalmanninella). It differs from R. globotruncanoides in being smaller in size and in having a more biconvex profile."

Entries in the Catalog of original descriptions: Thalmanninella brotzeni

Geological Range:
Last occurrence (top): within R. cushmani zone (94.03-95.94Ma, top in Cenomanian stage). Data source: [copied from Chronos database]
First occurrence (base): within T. globotruncanoides zone (96.08-100.50Ma, base in Cenomanian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

Character matrix

test outline:Subcircularchamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Subtriangularcoiling axis:Very lowperiphery:Single keelaperture border:Thin flange
umb chbr shape:Subrectangularumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:Sutural
spiral sutures:Raised beadedumb depth:Deepwall texture:Smoothshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Raised beadedfinal-whorl chambers:6.0-7.0 N.B. These characters are used for advanced search. N/A - not applicable

References:

Robaszynski, F., Caron, M. & le Groupe de Travail Européen des Foraminifères Planctoniques (1979). Atlas des Foraminiféres Planctoniques du Crétace Moyen (Mer Boréale et Téthys). Cahiers de Micropaléontologie. 1 & 2: 1-185. gs

Sigal, J. (1948). Notes sur les genres de foraminiferes Rotalipora Brotzen 1942 et Thalmanninella Famille des Globorotaliidae. Revue de l'Institut Francaise du Pétrole. 3(4): 95-103. gs


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Thalmanninella brotzeni compiled by the pforams@mikrotax project team viewed: 23-11-2020

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Short stable page link: http://mikrotax.org/pforams/index.php?id=110542 Go to Archive.is to create a permanent copy of this page - citation notes



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