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."
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:
sp chamber shape:
umb chbr shape:
periph margin shape:
umbilical or test sutures:
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:
Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
Taxon plotted: Gublerina rajagopalani, synonyms included - Heterohelix rajagopalani;