Costellagerina bulbosa

Taxonomy

Original description: Diagnosis: Test trochoid, spiral surface flat or only slightly convex, chambers globular, inflated, usually 4 in last whorl. Sutures depressed, surface of test ornamented with small ridges, on some chambers in a meridional pattern. Aperture interio- marginal umbilical, large.

Description: Test trochoid, both dextrally and sinistrally coiled forms known, with the latter the more common; umbilicus small, circular, usually infilled. Chambers globular, inflated, forming to 2-2½ whorls, successive whorls strongly overlapping and spiral surface flat or only slightly convex; usually four but sometimes five chambers on last whorl increasing only slowly in size as added. Very rare specimens have last chamber smaller than penultimate chamber, formed to one side of test and always smooth. Earlier chambers and sutures on spiral side often obscured by surface ornamentation, the later sutures straight or slightly curved, depressed; sutures on umbilical side straight, depressed. Surface of test ornamented with small discontinuous ridges, irregularly arranged on earlier chambers and forming meridional pattern on chambers of last whorl. Vail of test calcareous, finely perforate, radiate in structure. Aperture interiomarginal umbilical, large and arcuate, not always observed; well-preserved specimens have distinct tegilla extending over umbilicus.

Entries in the Catalog of original descriptions: Rugoglobigerina (Rugoglobigerina) bulbosa

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
• (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Costellagerina

Costellagerina bulbosa compiled by the pforams@mikrotax project team viewed: 14-1-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110079 Go to Archive.is to create a permanent copy of this page - citation notes

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