Thalmanninella appenninica

Taxonomy

Original description: Plate 6 shows that in the lower part of the sedimentary pile single-keeled globotruncanids are present, and this appears to be the most important in the evolution of their systematic standing are connected by intermediary forms with G. linnei. For this reason they cannot be combined with Globotruncana stuarti which appear distinctly much later. For this reason I place these oldest forms temporarily in the Globotruncana forms and describe them as Globotruncana appenninica.

Tafel VI zeigt, dass im untern Abschnitt der Schichtseric ein kielige Globorotaliiden auftreten, die — was mir bei der Beurteilung ihrer systematischen Stellung besonders wichtig erscheint — durch Zwischenformen (Taf. VI, Fig. 15—26) mit G. linnei verbunden sind und daher mit den wesentlich später erscheinenden G. stuarti nicht vereinigt werden können. Ich stelle daher auch diese ältesten Formen vorläufig zu den Globotruncanen und bezeichne sie als Globotruncana appenninica n. sp.

Die Unterscheidung der verschiedenen, mit einem peripheren Kiel versehenen Formen scheint auf den ersten Blick schwierig zu sein, da vorerst nur wenigen Merkmalen systematische Bedeutung zukommt. Im allgemeinen zeigt sich jedoch, dass G. appenninica n. sp. dickwandiger und flacher ist, als G. stuarti und die Globorotalien der jüngeren Scaglia. Von G. stuarti unterscheidet sich G. appenninica n. sp. ausserdem durch die Zunahme der Windungshöhe in den äusseren Umgängen.

Entries in the Catalog of original descriptions: Globotruncana appenninica, Globorotalia almadenensis

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): at base of P. appenninica zone (0% up, 101.9Ma, in Albian stage). Data source: zonal marker (from Timescale Creator)

Plot of range and occurrence data:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
• Taxon plotted: Thalmanninella appenninica, synonyms included - Globorotalia almadensis; Rotalipora appenninica; Rotalipora appenninica appenninica; Rotalipora appenninica primitiva; Parathalmanninella appenninica;
• See also space-time plot :: Samples map :: Parent: Thalmanninella

Thalmanninella appenninica compiled by the pforams@mikrotax project team viewed: 10-12-2023 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110540 Go to Archive.is to create a permanent copy of this page - citation notes

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