nmn

Praegublerina


Classification: pf_mesozoic -> Heterohelicidae -> Praegublerina
Sister taxa: Braunella, Gublerina, Hendersonites, Heterohelix, Huberella, Laeviheterohelix, Lunatriella, Planoglobulina, Planoheterohelix, Praegublerina, Protoheterohelix, Pseudoguembelina, Pseudotextularia, Racemiguembelina, Rectoguembelina, Sigalia, Spiroplecta, Ventilabrella, Zeauvigerina,
Daughter taxa (blue => in age window 0-300Ma)



Specimens which cannot be assigned to established species

Taxonomy

Citation: Praegublerina Georgescu, Saupe and Huber 2009
Rank: Genus
Basionym: Gublerina acuta robusta
Type species: Gublerina acuta robusta de Klasz 1953
Taxonomic discussion: Praegublerina nov. gen. differs from Heterohelix in having (i) a central nonseptate area between the two rows of diverging chambers, (ii) a chamber proliferation stage in the evolved taxa (e.g., P. acuta, P. robusta) and (iii) coarser costae than in H. planata, its ancestral species, and reticulate ornamentation, the latter being present either on distinct parts of the test or all over the test surface. Praegublerina differs from Gublerina in having (i) a multiserial stage with chamber sets increasing their number by one chamber at a time rather than three chambers with each successive chamber set, (ii) finer costae (when present) and reticulate ornamentation without smooth sutures and unornamented portions and (iii) transverse biaperturate walls between the chambers of the multiserial chamber stage (text-figure 4).

Type images:

Original description: Praegublerina: Diagnosis. Tests are biserial throughout or with a multiserial chamber stage in the adult portion; a chamber proliferation stage follows the biaperturate progressive chamber; maximum of three multiserial chamber sets that gradually increase their number by one; test ornamentation costate or reticulate throughout, or a combination of the two kinds.

Description. Test is biserial throughout in earlier species of the lineage with chamber proliferation in the adult stage in the more highly evolved forms. Test outline is subtriangular to flaring due to the addition of chambers in the proliferation stage. The earlier biserial stage presents a central nonseptate area bounded by two rows of divergent chambers. The chamber proliferation stage initiates with the progressive chamber, which is the first biaperturate chamber of the test, and is followed by up to three multiserial chamber sets, the latter increasing the chamber number by one as new sets are added (i.e., two, then three, then four additional chambers in successive multiserial chamber sets). The test periphery is broadly rounded without peripheral structures. The aperture is single at the base of the last-formed chamber in the biserial stage and multiple due to the presence of both monoand biaperturate chambers in the multiserial stage. Apertures are bordered by wide flanges that are occasionally rimmed. Transverse biaperturate walls can be developed between the chambers in the multiserial portion of the test. Chamber surface is costate or reticulate or a combination of the two. The reticulate ornamentation occurs later in the genus history, being derived from costate forms. Test wall is calcareous, hyaline, and microperforate to finely perforate.

Entries in the Catalog of original descriptions: Praegublerina;

Short diagnosis: Tests are biserial throughout or with a multiserial chamber stage in the adult portion; a chamber proliferation stage follows the biaperturate progressive chamber; maximum of three multiserial chamber sets that gradually increase their number by one; test ornamentation costate or reticulate throughout, or a combination of the two kinds.

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): within Campanian Stage (72.05-83.64Ma, base in Campanian stage). Data source: Total of range of species in this database

Plot of occurrence data:

NB Plotting of Neptune data has been disabled on the Mesozoic pages because the dataset is both small and badly affected by a few sites with erroneous age models (our obs Huber, Petrizzo, Young, Nov 2016). The data can still be viewed via the range plottertool - tools menu.

References:

Georgescu Saupe & Huber 2009 [sorry, not in our bibliography yet]


logo

Praegublerina compiled by the pforams@mikrotax project team viewed: 26-9-2017

Taxon Search:
Advanced Search
AphiaID: 1034803 Nomenclatural data on WoRMS
Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet. Be the first!

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics