Braunella punctulata

Classification: pf_mesozoic -> Heterohelicidae -> Braunella -> Braunella punctulata
Sister taxa: B. brauni, B. punctulata, B. sp.,


Citation: Braunella punctulata (Cushman, 1938)
Rank: Species
Basionym: Guembelina punctulata
Taxonomic discussion: Multiserial chambers may occur. Georgescu. 2007, p.6: "The ESEM photographs of the holotype do not reveal that additional apertures along the zigzag suture as drawn by Pessagno (1967, pl. 86, figs. 9-10). To the contrary, it is the absence of additional apertures along the zigzag suture, together with the more regular increase in chamber size during the ontogeny that separates this species of Braunella brauni nov.gen., nov.sp." [copied from Chronos database]

Type images:

Original description: Guembelina punctulata Cushman 1938: "Test widely flaring in juvenile stage, sides subparallel in adult. Test broad and rounded, about 11 times as broad, initial portion rapidly tapering, later portion of nearly uniform width, periphery of early portion keeled, later indented; chambers of the early portion somewhat compressed, keeled, much broader than high, rapidly inflated in the adult where they are globular; sutures in the early portion slightly costate or with the fine perforations in vertical lines, in the adult thicker-walled with the surface rather coarsely punctate; aperture, a low, broad arch with a slight lip, the sides continuing in flange onto the preceding chamber."

Entries in the Catalog of original descriptions: Guembelina (Guembelina) planeobtusa;
Guembelina punctulata;
Heterohelix robusta;
Pseudotextularia echevarriai;

Emended description: Georgescu. 2007, p.6: "Test biserial throughout at most specimens, consisting of ten to seventeen chambers. Chamber proliferation may occur between the two rows of diverging chambers. Chambers are subspherical throughout, distinctly overlapping the previous ones these resulting in a slightly lobate test periphery in lateral view. They increase rapidly in size in the earlier part of the test but more slowly in the adult portion. Sutures are distinct, depressed, and straight to slightly oblique to the growth axis. Periphery broadly rounded, without peripheral structures such as rows of pustules, keels, etc. Aperture is situated at the base of the last formed chamber and is bordered by a wide, imperforate band. Test with irregularly reticulate ornamentation throughout; occasionally the last-formed chambers are longitudinally costate. Test wall is calcareous, hyaline, and finely perforate, pore diameter fluctuating between 1.3 and 2.4 microns. The size of the pores is dependent on the irregularly reticulate ornamentation and addition of successive layers of calcite during the ontogenetic growth." [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 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

Character matrix

test outline:Subtriangularchamber arrangement:Biserialedge view:Compressedaperture:Interiomarginal
umb chamber shape:Inflatedcoiling axis:N/Aperiphery:N/Aaperture border:Thin flange
sp chbr shape:Inflatedumbilicus:N/Aperiph margin shape:Broadly roundedaccessory apertures:None
umbilical or test sutures:Moderately depressedumb depth:N/Awall texture:Finely costateshell porosity:Finely Perforate: 1-2.5┬Ám
spiral sutures:Moderately depresseddiameter mm:0.45-0.55width mm:0.22-0.25breadth mm:0.32-0.35
final-whorl chambers:2.0-2.0


Cushman, J.A., (1938). Cretaceous species of Guembelina and related genera. Contributions from the Cushman Laboratory for Foraminiferal Research, 14: 2-28.


Braunella punctulata compiled by the pforams@mikrotax project team viewed: 24-2-2018

Taxon Search:
Advanced Search

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
Captcha Image
Powered by Commentics