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Pseudothalmanninella subticinensis


Classification: pf_mesozoic -> Rotaliporidae -> Pseudothalmanninella -> Pseudothalmanninella subticinensis
Sister taxa: P. klausi, P. subticinensis, P. tehamaensis, P. ticinensis, P. sp.

Taxonomy

Citation: Pseudothalmanninella subticinensis (Gandolfi, 1957)
Rank: Species
Basionym: Globotruncana subticinensis
Taxonomic discussion: R. subticinensis is intermediate between T. praeticinensis and R. ticinensis and not between T. roberti and R. ticinensis as in the description (see Sigal 1966, p. 195 and Lipson-Benitah and Almogi-Labin, 2000). [copied from Chronos database]

Type images:

Original description: This new subspecies is proposed for tests of Globotruncana (Thalmanninella) ticinensis Gandolfi with a partially developed keel. It serves as a link between the completely keeled form of Globotruncana (thalmanninella) ticinensis and Globotruncana (Ticinella) roberti (Gandolfi) [Anomalina roberti, 1942] (see Gandolfi, 1942, op.cit., p. 135, and Reichel, 1950, Eclogae Geol. Helv., vol. 42, no. 2, pp. 600-601). This subspecies, however, needs a new description, because Gandolfi (1942, op. cit., p. 113) states that Globotruncana ticinensis var. a has beaded sutures restricted to the inner coils of the test. The type description of the new subspecies, therefore, is as follows: "Test rotaliform, similar to that of Globotruncana (Thalmanninella) ticinesis Gandolfi subsp. ticinensis Gandolfi, with a single-keeled test and beaded sutures in the early stages (inner coils) only. the keel is thicker than that in the type, with coarser papillae (see Reichel, 1950, op. cit., p. 604). Chambers in the last coil inflated and with a rounded periphery. Faint indications of beaded sutures in the earliest chambers of the last coil. "A good illustration of the form showing apertural details is given by Reichel (1950, op. cit., pl. 16, fig. 2 [as Globotruncana (Thalmanninella) ticinensis var. a).

Entries in the Catalog of original descriptions: Globotruncana (Thalmanninella) ticinensis subticinensis

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): at base of P. subticinensis zone (0% up, 107Ma, in Albian stage). Data source: zonal marker (from Timescale Creator)

Plot of range and occurrence data:

Character matrix

test outline:Subcircularchamber arrangement:Trochospiraledge view:Equally biconvexaperture:-
sp chamber shape:Subrectangularcoiling axis:Low-moderateperiphery:Single keelaperture border:Thin lip
umb chbr shape:Trapezoidalumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:Relict
spiral sutures:Raised beadedumb depth:Deepwall texture:Finely pustuloseshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:8.0-11.0 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

Lipson-Benitah, S. & Almogi-Labin, A. (2004). Aptian planktonic foraminifera from Israel. Israel Journal of Earth Sciences. 53(1): 27-46. gs

Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. gs

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


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Pseudothalmanninella subticinensis compiled by the pforams@mikrotax project team viewed: 23-11-2020

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