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Thalmanninella balernaensis


Classification: pf_mesozoic -> Rotaliporidae -> Thalmanninella -> Thalmanninella balernaensis
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 balernaensis (Gandolfi, 1957)
Rank: Species
Basionym: Globotruncana (Rotalipora) appenninica balernaensis Gandolfi, 1957
Taxonomic discussion: The cover-plate of P. balernaensis partially obstructs the umbilical depression. This species has a keel on all chambers, unlike P. praebalernaensis.
[copied from Chronos database]

Type images:

Original description: "Gandolfi's (1942, op. cit. p. 118) description of this form is herein amended as follows: 'Test rotaliform, large and thin, with a well developed single keel. Outline subcircular, tending to become elongated, spiral side slightly convex, umbilical side slightly concave. Chambers flat on dorsal side, convex on ventral side, becoming elongated. Umbilical sutures generally radial and depressed, thickening slightly around teh umbilicus'."

Entries in the Catalog of original descriptions: Globotruncana (Rotalipora) appenninica balernaensis


Emended description: Test rotaliform, large, thin, with a well developed single keel. Outline subcircular, tending to become elongated, spiral side slightly convex, umbilical side slightly concave. Chambers flat on dorsal side, convex on ventral side, becoming elongated. Umbilical sutures generally radial and depressed, thickening slightly around the umbilicus. [copied from Chronos database]

Geological Range:
Last occurrence (top): within P. appenninica zone (100.50-101.92Ma, top in Albian stage). Data source: [copied from Chronos database]
First occurrence (base): within P. ticinensis zone (101.92-103.94Ma, base in Albian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Spiroconvexaperture:-
sp chamber shape:Petaloidcoiling axis:Lowperiphery:Single keelaperture border:Thin lip
umb chbr shape:Trapezoidalumbilicus:Wideperiph margin shape:Subangularaccessory apertures:Umbilical
spiral sutures:Raised beadedumb depth:Shallowwall texture:Smoothshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:6.5-8.0 N.B. These characters are used for advanced search. N/A - not applicable

References:

Gandolfi, R. (1957). Notes on some species of Globotruncana. Contributions from the Cushman Foundation for Foraminiferal Research. 8(2): 59-65. gs V O

Loeblich, A. R. & Tappan, H. (1961). Cretaceous planktonic foraminifera: Part I-Cenomanian. Micropaleontology. 7: 257-304. gs

Petrizzo, M. R. & Huber, B. T. (2006). Biostratigraphy and taxonomy of late Albian planktonic foraminifera from ODP Leg 171B (western North Atlantic Ocean). Journal of Foraminiferal Research. 36: 166-190. gs


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Thalmanninella balernaensis 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=110541 Go to Archive.is to create a permanent copy of this page - citation notes



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