Taxonomy
[copied from Chronos database]
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
Character matrix
test outline: | Subcircular | chamber arrangement: | Trochospiral | edge view: | Equally biconvex | aperture: | Umbilical-extraumbilical |
sp chamber shape: | Subtriangular | coiling axis: | Very low | periphery: | Single keel | aperture border: | Thin flange |
umb chbr shape: | Subrectangular | umbilicus: | Narrow | periph margin shape: | Subangular | accessory apertures: | Sutural |
spiral sutures: | Raised beaded | umb depth: | Deep | wall texture: | Smooth | shell porosity: | Finely Perforate: 1-2.5µm |
umbilical or test sutures: | Raised beaded | final-whorl chambers: | 6-7 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): within R. cushmani zone (94.03-98.69Ma, top in Cenomanian stage). Data source: [copied from Chronos database]
First occurrence (base): within T. globotruncanoides zone (98.85-100.50Ma, base in Cenomanian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
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. gsReferences:
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Thalmanninella brotzeni compiled by the pforams@mikrotax project team viewed: 26-4-2025
Short stable page link: https://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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