CATALOG OF ORIGINAL DESCRIPTIONS: Bermudeziana Georgescu 2011

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 -> Bermudeziana
Other pages this level: Badriella, Bandyus, Beella, Berggrenia, Bermudeziana, Biglobigerinella, Biorbulina, Biticinella, Blefuscuiana, Blowellus, Blowiella, Bolivina, Bolliella, Bollitruncana, Braunella, Bucherina,

Bermudeziana

Citation: Bermudeziana Georgescu 2011
Rank: Genus
Type species: Praeglobotruncana hilalensis Barr, 1972

Current identification/main database link: Not linked - add to pf_cenozoic :: pf_mesozoic :: ?

See also: Praeglobotruncana hilalensis - type species;


Original Description
Test is trochospiral; trochospire height grad- ually increases from low to medium-high in the IS to medium-high to high in the FDS and SDS. Earlier cham- bers are globular, the last formed ones axially compressed; the number of axially compressed chambers increases from the IS to FDS and SDS. Chamber shape is variable on the spiral side, from petaloid in the IS and FDS to petaloid to subtrapezoidal in the SDS; chambers are subtriangular to subrectangular on the umbilical side. Sutures on the spiral side are depressed throughout in the IS and raised in the penultimate whorl and between the earlier chambers of the final one in the FDS and SDS; sutures on the umbil- ical side are depressed, straight and radial. Tests are asym- metrical in edge view, with spiral side of variable convexity and slightly concave umbilical side. Periphery is rounded to subangular in the IS and subangular to trun- cate in the FDS and SDS. Peripheral structures exhibit in- creased complexity along the lineage and, in the IS consist of an agglomeration of pustules that can fuse occasionally and a wide keel consisting of agglomerated pustules that can occasionally fuse in the FDS and SDS; an occasional row of pustules on the umbilical side and parallel to the periphery in the FDS and SDS result in a double keeled appearance. Main aperture is a low to medium-high open- ing, variable in position in the IS (umbilical-extraumbilical to extraumbilical-umbilical) and extraumbilical-umbilical in the FDS and SDS. An imperforate triangular flap bor- ders the aperture in the IS; the most complex periapertural structures, consisting of imperforate triangular flap or por- ticus that merge in the umbilical region, are developed in the FDS and SDS. Umbilicus is medium-sized, with the diameter of approximately one fourth to one third of the maximum test diameter; relict periapertural structures occur in the umbilical region. Chambers are ornamented with scattered dome-like pustules; symmetrical ornamen- tation occurs in the IS and the FDS and SDS present asym- metrical ornamentation, with bigger pustules on the umbilical side and smaller on the spiral side. Test wall is calcitic, hyaline simple in the IS and simple to ridged in the FDS and SDS and perforate; pore diameter is smaller in the IS.

Etymology: Genus/directional lineage named in honour of Dr Pedro J. Bermúdez who realized for the first time the taxonomical significance of the praeglobotruncanid test architecture. The suffix “–iana” is added to his name.

Extra details from original publication
Remarks.– The new directional lineage Bermudeziana differs from Praeglobotruncana by having (i) the main aper- ture bordered by an imperforate triangular flap, which, in the SDS evolves in a porticus rather than an imperforate lip or occasionally a triangular flap, (ii) periphery with well-developed keel and occasionally with double keeled appearance, (iii) larger umbilici (one fourth to one third rather than one fifth to one fourth of the maximum test di- ameter), (iv) ornamentation consisting of denser pustules, which exhibits an asymmetrical pattern in the first and SDS and (v) larger pores. Bermudeziana and Praeglobotruncana evolved from different ancestors (Whiteinella and Hedbergella respectively), at different time (late Cenomanian rather than late Albian) and have different extinction timing (Coniacian rather than late Cenomanian).

Stratigraphic range.– Upper Cenomanian-lower Coniacian (from the R. cushmani Biozone to D. concavata Biozone).

References:

Georgescu, M. D. (2011b). Iterative evolution, taxonomic revision and evolutionary classification of the praeglobotruncanid planktic foraminifera, Cretaceous (late Albian-Santonian). Revista Española de Micropaleontología. 43: 173-207. gs


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Bermudeziana compiled by the pforams@mikrotax project team viewed: 29-3-2020

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