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Braunella


Classification: pf_mesozoic -> Heterohelicidae -> Braunella
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: Braunella Georgescu, 2007
Rank: Genus
Type species: Gümbelina punctulata Cushman, 1938
Taxonomic discussion: The distinct, irregular reticulation of the test separates Braunella nov. gen. of the coeval Heterohelix s.l. species, the latter having dominant costate ornamentation, and from Pseudotextularia, which has pronounced, coarse costae. Occasional chamber proliferation in Braunella nov. gen. is developed between two rows of diverging chambers, whereas, by contrast, in Pseudotextularia-Racemiguembelina lineage the chambers of the proliferating stage are added in two planes resulting in a cone-shaped test. Pseudoguembelina Brönnimann & Brown presents secondary apertures along the zigzag suture as a result of chamber prolongation. By contrast, the supplementary apertures in Braunella are the result of the development of the periapertural structures. The ornamentation is different in Pseudoguembelina and Braunella, the former being completely costate and the latter presenting irregular reticulate ornamentation.

Type images:

Original description: Braunella Georgescu 2007: Diagnosis.– Test biserial, with  subspherical chambers throughout. Chambers increase more or less regularly in size as added. Sutures distinct and depressed. Main aperture in the shape of a low- to medium-high arch, situated at the base of the last-formed chamber. Test ornamentation irregularly reticulate, at least in the earlier portion; chambers sometimes costate.
Description.–  Test robust, biserial throughout. Chambers are subspherical, with the younger distinctly overlapping the previously formed ones. Chambers increase more or less regularly  in size as added, resulting  in highly variable shape of the test in lateral view. Chamber proliferation may occur occasionally in rare specimens. Sutures are distinct, depressed, and straight to slightly oblique to the axis of growth. Main  aperture has the shape of a low  to medium high arch, situated at the base of the last formed chamber of the test. It is bordered by two lateral, imperforate, rod-like rims, which are or are not attached to the penultimate chamber, and a wide imperforate band in the central part. Additional apertures can be developed along the zigzag suture if the rod-like rims are suspended. Test ornamentation is irregularly reticulate throughout. Costate ornamentation was observed on the last-formed chambers of some specimens. The test wall is calcareous, hyaline, finely perforate, the pores being situated in the spaces de- fined by the irregular reticulate network, or between the robust costae.

Entries in the Catalog of original descriptions: Braunella;

Distinguishing features: Test biserial, with subspherical chambers throughout. Chambers increase more or less regularly in size as added. Sutures distinct and depressed. Main aperture in the shape of a low- to medium-high arch, situated at the base of the last-formed chamber. Test ornamentation irregularly reticulate, at least in the earlier portion; chambers sometimes costate.

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:

Dec 2017 - Plotting of Neptune data has been re-enabled on the Mesozoic pages following revision of the age-models in Neptune. The data is, however, still very sparse for the Early Cretaceous

References:

Georgescu, M.D., (2007). Taxonomic re-evaluation of the Late Cretaceous serial planktonic foraminifer Gümbelina punctulata Cushman, 1938 and related species. Revista Española de Micropaleontología, 39: 1-14.


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Braunella compiled by the pforams@mikrotax project team viewed: 21-5-2018

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Comments (1)

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Le Coze

The author of Braunella is Georgescu, 2007 as mentionned in the references.

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Jeremy Young (UK)

thanks - corrected now Jeremy

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