Globotruncanita conica

Taxonomy

Original description: "Test large, strongly spiroconvex, coiled in a high trochospire. Spiral side strongly convex, umbilical side convex. Equatorial periphery circular, slightly lobate with a double keel composed of one primary and strongly beaded keel and a weakly developed secondary keel visible in the umbilical side of the periphery. Chambers arranged in 4 whorls increasing in size in the direction of coiling. Initial chambers small and globular and followed by larger, subpetaloid chambers becoming gradually larger in the direction of coiling. Final whorl composed of subpetaloid chambers on spiral side, on umbilical side ovoid chambers elongated in the direction of coiling. Sutures on spiral side curved, raised and strongly beaded, on umbilical side slightly curved, raised in the beginning of the last whorl and finally become depressed. Umbilicus raised in the beginning of the last whorl and finally become depressed. Umbilicus wide and deep, surrounded by periumbilical ridges and covered by tegilla. Primary aperture interiomarginal umbilical. Accessory apertures intralaminal. Surface smooth. Wall calcareous, perforate except for tegilla and keels."

Entries in the Catalog of original descriptions: Globotruncana conica, Globotruncana dorreeni

Geological Range:
Last occurrence (top): within G. gansseri zone (71.73-73.80Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. gansseri zone (71.73-73.80Ma, 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: Globotruncanita conica, synonyms included - Globotruncana conica; Globotruncana doreeni; Globotruncanita conica; Globotruncanita dorreeni;
• See also space-time plot :: Samples map :: Parent: Globotruncanita

Globotruncanita conica compiled by the pforams@mikrotax project team viewed: 13-10-2026 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110192 Go to Archive.is to create a permanent copy of this page - citation notes

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