pforams@mikrotax - Praegublerina robusta

Praegublerina robusta


Classification: pf_mesozoic -> Heterohelicidae -> Praegublerina -> Praegublerina robusta
Sister taxa: P. acuta, P. pseudotessera, P. robusta, P. sp.

Taxonomy

Citation: Praegublerina robusta (De Klasz, 1953)
Rank: species
Basionym: Gublerina acuta robusta
Synonyms:

Type images:

Original description: Similar to Gublerina acuta but generally larger, with bigger, more globular chambers, which are usually even more inflated in the middle of the lateral rows of chambers than the others. The two lateral rows are sometimes connected with two calcareous lamellae instead of one. The sutures are deeper than in Gublerina acuta.

Entries in the Catalog of original descriptions: Gublerina acuta robusta


Emended description: Georgescu, Saupe & Huber. 2009, P.407-408: "The test is biserial in the younger stage and multiserial in the adult stage. The small proloculus is followed by a biserial stage with two rows of divergent alternating chambers. The earliest chambers of the biserial stage are subglobose and become rounded to subrectangular. The latest formed chambers are reniform and distinctly tilted. The multiserial stage begins after the biaperturate progressive chamber and consists of a maximum of three sets of chambers, the earlier one presenting two chambers beyond the progressive chamber (P) and the number of chambers increasing by one for each newly added chamber set. Sutures are distinct and depressed, consistently oblique with respect to the longitudinal axis of the test. The main aperture in the biserial part of the test is single, a medium-high arch at the base of the last formed chambers. The progressive chamber is the first biaperturate chamber of the test; remaining chambers of the multiserial stage being either monoaperturate if they are situated adjacent to the test periphery or biaperturate if they are towards the central parts of the multiserial stage. Apertures are bordered by well developed periapertural flanges, which are generally flat or gently folded. The flanges bound the central nonseptate area between the two diverging rows of chambers. Biaperturate transverse walls are present in well-preserved Specimens. Test surface is costate to reticulate with the costae thickness varying between 2.9 and 4.0 microns in the adult specimens; ornamentation may be thicker over the chamber in the earlier part of the test. Pore diameter can be up to 1.9 microns in the portions of the tests with reticulate ornamentation; however, the last added chambers present smaller pores with diameters between 0.6 and 0.9 microns." [copied from Chronos database]

Geological Range:
Last occurrence (top): within P. hariaensis zone (66.39-67.30Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within R. calcarata zone (75.71-76.18Ma, base in Campanian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

Character matrix
test outline:Subtriangularchamber arrangement:Multiserialedge view:Compressedaperture:Biapertural
sp chamber shape:Reniformcoiling axis:N/Aperiphery:N/Aaperture border:Thick flange
umb chbr shape:Reniformumbilicus:N/Aperiph margin shape:Moderately roundedaccessory apertures:-
spiral sutures:Moderately depressedumb depth:N/Awall texture:Coarsely costateshell porosity:Microperforate: <1µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:3.0-8.0 N.B. These characters are used for advanced search. N/A - not applicable

References:

de Klasz, I. (1953b). On the Foraminiferal Genus Gublerina Kikoïne. Geologica Bavarica. 17: 245-251. gs V O

Georgescu, M. D., Saupe, E. E. & Huber, B. T. (2009). Morphometric and stratophenetic basis for phylogeny and taxonomy in Late Cretaceous gublerinid planktonic foraminifera. Micropaleontology. 54(5): 397-424. gs

Pessagno, E. A. (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontographica Americana. 5: 245-445. gs V O


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Praegublerina robusta compiled by the pforams@mikrotax project team viewed: 28-11-2021

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110442 Go to Archive.is to create a permanent copy of this page - citation notes



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