Rugoglobigerina milamensis

Taxonomy

Original description: Test trochospiral, strongly spiroconvex, early whorls offset in a higher plane than ultimate whorl; peripheral margin subcircular, lobate; 5-6 chambers in the final whorl spherical to subspherical, in apertural and abapertural views slightly elongate axially, ultimate chamber slightly offset umbilically; initial chambers on spiral side increasing rapidly in size as added, chambers of final whorl increasing only slightly in size; sutures radial, curved, strongly, depressed; chambers of ultimate whorl heavily rugose, rugosities or costellae closely spaced, aligned in a meridional pattern, ultimate chamber generally more finely rugose; wall finely perforate; umbilicus large, subrectangular, deep; primary aperture interiomarginal, umbilical; spiral system of tegilla with intralaminal and infralaminal accessory apertures poorly preserved in specimens examined.

Entries in the Catalog of original descriptions: Rugoglobigerina milamensis

Geological Range:
Last occurrence (top): within A. mayaroensis zone (67.64-69.27Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within R. fructicosa zone (69.27-70.14Ma, base in Maastrichtian 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: Rugoglobigerina milamensis, synonyms included - Rugoglobigerina milamensis;
• See also space-time plot :: Samples map :: Parent: Rugoglobigerina

Rugoglobigerina milamensis compiled by the pforams@mikrotax project team viewed: 12-1-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110502 Go to Archive.is to create a permanent copy of this page - citation notes

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