Costellagerina

Daughter taxa (time control age-window is: 0-800Ma)
			Costellagerina bulbosa
			Costellagerina pilula
			Costellagerina sp. Specimens which cannot be assigned to established species

Taxonomy

Original description: Test low to medium trochospirai; outline sub-circular, ovate, or quadrate; equatorial periphery strongly lobulate; axial periphery broadly rounded; chambers globose; aperture an interiomarginal, low arch, umbilical to slightly extraumbilical, bordered by a porticus; umbilicus open, small tomoderate in size. Wall hyaline, ornamented with pustules and costellae which are meridionally arranged.

Entries in the Catalog of original descriptions: Costellagerina

Distinguishing features:
Parent taxon (Hedbergellidae): Test trochospirally coiled, primary aperture interiomarginal, extraumbilical-umbilical, with prominent apertural lip, apertures of earlier chambers remain visible around the umbilical region; no sutural secondary apertures.
This taxon: Test with low to medium trochospiral coil of few, rapidly enlarging, spherical chambers per whorl, sutures radial, depressed, periphery rounded, peripheral margin lobulate; wall calcareous, hyaline, optically radial, finely perforate, surface with meridionally aligned pustules and costellae resulting from fusion of adjacent pustules; aperture a low interiomarginal, umbilical to slightly extraumbilical arch, with a narrow bordering lip.

Geological Range:
Last occurrence (top): at top of G. elevata zone (100% up, 79.3Ma, in Campanian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within D. asymetrica zone (83.65-85.60Ma, base in Santonian 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: Hedbergellidae

Costellagerina compiled by the pforams@mikrotax project team viewed: 14-10-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110078 Go to Archive.is to create a permanent copy of this page - citation notes

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