Globotruncanella

Daughter taxa (time control age-window is: 0-800Ma)
			Globotruncanella compressiformis
			Globotruncanella havanensis
			Globotruncanella minuta
			Globotruncanella petaloidea
			Globotruncanella pschadae
			Globotruncanella semsalensis
			Globotruncanella sp. Specimens which cannot be assigned to established species

Taxonomy

Original description: Test flatly trochospiral; chambers flat, slightly inflated; peripheral margin subacute to acute, imperforate, provided with an undifferentiated keel; keel pustulose to spinose, never showing tendencies to split into two keels, forming dorso-septal branches only, which are usually weak; ventro-septal branches and periumbilical extensions absent; cameral aperture interiomarginal-umbilical; lips fairly long, slightly arched lengthwise, covering partly the small umbili- cus. Ceriomanian to Maestrichtian.

Entries in the Catalog of original descriptions: Globotruncanella

Distinguishing features:
Parent taxon (Globotruncanidae): Test trochospiral, chambers angular, periphery truncate or carinate; primary aperture umbilical, covered by a spiral system of tegilla that is provided with accessory intralaminal and infralaminal apertures.
This taxon: Test a low trochospiral, planoconvex to concavoconvex, compressed, chambers petaloid, about five in the final whorl, sutures radial, depressed, umbilicus of narrow to medium size, periphery acutely angled, with nonperforate carinal band or true keel, peripheral outline lobulate; wall calcareous, perforate, with pustulose suface and peripheral keel; primary aperture interiomarginal, extraumbilical-umbilical, in early chambers provided with a small triangular porticus, later with a distinct tegillum crossing the umbilicus, and with accessory apertures around the margins.

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Danian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within G. ventricosa zone (76.18-79.20Ma, base in Campanian stage). Data source: Total of ranges of species in this 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
• Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Globotruncanidae

Globotruncanella compiled by the pforams@mikrotax project team viewed: 14-12-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110178 Go to Archive.is to create a permanent copy of this page - citation notes

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