Rugoglobigerina macrocephala

Taxonomy

Original description: The small to medium-sized trochoidal test is 4 to 5-chambered in the adult. The rather small and deep umbilicus is filled with matrix and no signs of a covering plate were observed. The spiral side is centrally depressed and shows in well-preserved specimens about 2 whorls. The subglobular chambers are truncate toward the umbilicus and increase rapidly in size as added. The peripherally somewhat flattened end chamber is much larger than the penultimate one, and in many individuals equals the whole preceding spiral in size. The straight sutures are well developed in the adult stage. The large semicircular aperture of the end chamber is provided with a minute liplike border and opens into the umbilicus. The apertures of the preceding chambers are not visible. The walls are thick and the surface is rugose. The ornamentation of the early chambers is irregular and coarsely hispid whereas the 2 last-formed chambers show the meridional pattern. The rugosities are delicate and composed of numerous fine continuous and discontinuous ridges. All the investigated individuals are dextrally coiling.

Entries in the Catalog of original descriptions: Rugoglobigerina macrocephala macrocephala, Globotruncana (Rugoglobigerina) macrocephala submacrocephala, Rugoglobigerina macrocephala ornata

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 G. gansseri zone (71.73-73.80Ma, base in Campanian 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 macrocephala, synonyms included - Globotruncana macrocephala submacrocephala; Rugoglobigerina macrocephala; Rugoglobigerina macrocephala ornata; Rugoglobigerina ornata; Rugoglobigerina submacrocephala;
• See also space-time plot :: Samples map :: Parent: Rugoglobigerina

Rugoglobigerina macrocephala compiled by the pforams@mikrotax project team viewed: 8-2-2026 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110501 Go to Archive.is to create a permanent copy of this page - citation notes

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