Costellagerina pilula

Taxonomy

Original description:

Diagnosis: Test trochoid, chambers globular, inflated, arranged in a high spire, 5-6 in last whorl. Sutures depressed, surface of test ornamented with small ridges, on some chambers in a meridional pattern. Aperture interiomarginal umbilical, large.

Description: Test trochoid, both dextrally and sinistrally coiledforms known, with the latter the more common; umbilicus small, circular, usually infilled. Test trochoid, both dextrally and sinistrally coiled forms occurring, with the latter the more common; umbilicus small, circular, usually infilled. chambers globular, strongly inflated, forming two and one-half to three whorls, each whorl only partly overlapping the one preceding, forming a high sire; five or six chambers in last whorl, increasing slowly in size as added. Sutures straight or slightly curved on spiral side, straight on umbilical side, depressed on both sides. Test ornamented with small discontinuous ridges, irregularly arranged on early chambers and forming a meridional pattern on chambers of last whorl, the last one or two chambers may be smooth. Wall of test calcareous, finely perforate, radiate in structure. Aperture interiomarginal umbilical, large and arcuate, not often observed because of infilling umbilicus; only remnants of tegilla have been observed.

Entries in the Catalog of original descriptions: Rugoglobigerina (Rugoglobigerina) pilula, Rugoglobigerina (Rugoglobigerina) plana

Geological Range:
Last occurrence (top): within G. elevata zone (79.33-83.65Ma, top in Campanian stage). Data source: [copied from Chronos database]
First occurrence (base): within D. asymetrica zone (83.65-85.60Ma, base in Santonian 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: Costellagerina pilula, synonyms included - Archaeoglobigerina pilula; Costellagerina bulbosa; Costellagerina pilula; Costellagerina plana; Rugoglobigerina bulbosa; Rugoglobigerina pilula; Rugoglobigerina plana;
• See also space-time plot :: Samples map :: Parent: Costellagerina

Costellagerina pilula compiled by the pforams@mikrotax project team viewed: 14-2-2026 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110080 Go to Archive.is to create a permanent copy of this page - citation notes

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