pforams@mikrotax - Gublerina rajagopalani

Gublerina rajagopalani


Classification: pf_mesozoic -> Heterohelicidae -> Gublerina -> Gublerina rajagopalani
Sister taxa: G. cuvillieri, G. rajagopalani, G. sp.

Taxonomy

Citation: Gublerina rajagopalani Govindan 1972
Rank: Species
Basionym: Gublerina rajagopalani

Type images:

Original description: "Test rapidly flaring in juvenile stage, less flaring in adult, adult chambers subglobular to reniform; early chambers covered with coarse, irregular ridges, later chambers more finely costate; early periphery keeled or subangular, later subrounded; relict apertural flanges visible as depressed areas along median suture."

Entries in the Catalog of original descriptions: Gublerina rajagopalani


Emended description:

Georgescu, Saupe & Huber. 2009, p.410: "Test is biserial throughout and has a subtriangular outline in lateral view and is slightly compressed in edge view. Chambers are subrectangular in the earlier part of the test and variable in the adult portion, ranging from reniform in the primitive tests to subrectangular in the evolved ones. Test periphery is broadly rounded to subangular. Sutures are distinct, depressed, slightly oblique to almost perpendicular on the test axis of growth in the evolved specimens. The central suture may be bordered by subtriangular depressed areas. The two rows of biserial chambers are symmetrically divergent with respect to the growth axis of the test. Test periphery has one or two more or less continuous strong costae, resulting in a keeled appearance. Aperture is a low to medium high arch at the base of the last formed chamber. It is bordered by two well-developed flanges, which are rarely fused above the aperture. Test wall is coarsely costate on the earlier part of the test with amorphous agglomerations of fused ornamentation elements over the last-formed chambers, leaving the sutures flush. The last-formed chamber or, rarely, several chambers may be finely costate. Test wall calcitic, hyaline and microperforate." [copied from Chronos database]

Morphology:

Wall type:

Size:

Character matrix
test outline:Subtriangularchamber arrangement:Biserialedge view:Compressedaperture:Interiomarginal
sp chamber shape:Subrectangularcoiling axis:N/Aperiphery:Single keelaperture border:Thin flange
umb chbr shape:Subrectangularumbilicus:N/Aperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Weakly depressedumb depth:N/Awall texture:Coarsely costateshell porosity:Microperforate: <1┬Ám
umbilical or test sutures:Weakly depressedfinal-whorl chambers:2.0-2.0 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within A. mayaroensis zone (67.30-69.18Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. ventricosa zone (76.18-79.20Ma, base in Campanian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

References:

Govindan, A. (1972). Upper Cretaceous planktonic foraminifera from the Pondicherry area, South India. Micropaleontology. 18: 160-193. gs

Nederbragt, A. J. (1991). Late Cretaceous biostratigraphy and development of Heterohelicidae (planktic foraminifera). Micropaleontology. 37: 329-372. gs


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Gublerina rajagopalani compiled by the pforams@mikrotax project team viewed: 30-11-2022

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110216 Go to Archive.is to create a permanent copy of this page - citation notes



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