CATALOG OF ORIGINAL DESCRIPTIONS: Braunella brauni Georgescu 2007

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.

Higher levels: pf_cat -> B -> Braunella -> Braunella brauni
Other pages this level: B. brauni

Braunella brauni

Citation: Braunella brauni Georgescu 2007
Rank: Species
Type locality: DSDP Leg 62, Site 463 (Shatsky Rise,equatorial Pacific). Geographical coordinates: 21 21' N, 174 40' E.
Type age (chronostrat): Late Campanian (Globotruncanella havanensis Biozone)
Type specimens: 534379
Type repository: Washington; USNM

Linked specimens: USNM-546217 USNM-546216 USNM-534380 USNM-534379

Current identification/main database link: Braunella brauni Georgescu 2007

Original Description
Test biserial throughout, chamber proliferation not observed in any of the studied specimens. Chambers are subspherical throughout, those of the earlier part of the test increase rapidly in size. Kummerform lastformed chambers are common. The rate of chamber growth is lower in the adult stage. The two rows of biserially arranged chambers are slightly divergent in some specimens. Sutures are distinct, depressed, and perpendicular to slightly oblique to the growth axis of the test. Periphery is broadly rounded, without any peripheral structures. Main aperture is in the shape of a low to, more rarely, a medium high arch at the base of the last-formed chambers. It is bordered in the central part by an imperforate band and two detached rod-like rims symmetrically arranged on the two sides of the test. The detached rims define additional apertures along the zigzag suture in the portion of the last-formed one to four chambers. Test ornamentation is irregularly reticulate, costate ornamentation being present on the last-formed one to two chambers of some specimens. Test wall is calcareous, hyaline, and finely perforate, pore diameter being in the range of 1.9-2.5 microns.

Size: Holotype dimensions.– Length: L=0.493 mm; width: W=0.359 mm; thickness: T=0.228 mm; W/L=0.728; T/L=0.462; apical angle: A=108deg.; flaring angle in the adult stage: AA=6deg.

Etymology: The genus named after Professor Willi K. Braun (University of Saskatchewan) in appreciation for his dedication to micropaleontological-biostratigraphical studies of the Paleozoic and Mesozoic microfaunas of Western and Arctic Canada.

Extra details from original publication

Remarks.– Braunella brauni nov. gen., nov. sp. differs from any other Cretaceous serial planktonic  foraminiferal species by presenting the following combination of features: (i) distinct irregularly ornamented test surface, (ii) additional apertures along the zigzag suture, which are defined by the detached rod-like rims that border laterally the main aperture of the test (Fig. 4), and (iii) fluctuating rate of chamber size increase during the ontogenetic development.

Phylogenetic relationships.– This species most likely evolved from Braunella punctulata (Cushman)  as a result of development of (i) rather irregular chamber growth in the adult stage, and (ii) free periapertural rod-like rims, which result in the presence of pseudo-apertural openings along the zigzag suture. The stratigraphic ranges of the two species furthermore support this interpretation, with B. punctulata’s first evolutionary occurrence being recorded from the late Campanian (Radotruncana calcarata Biozone), and that of the descendant species in the younger Globotruncanella havanensis Biozone.



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


Braunella brauni compiled by the pforams@mikrotax project team viewed: 11-4-2021

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