Hastigerinoides atlanticus

Taxonomy

Original description: Test planispiral, biumbilicate, with strongly lobate to stellate outline. Chambers globular to suglobular in the earlier portion of the test; the ultimate chamber or, rarely, the ultimate and penultimate chambers are conical and radially elongate, 4.5 to 5.5 chambers in the final whorl, increasing slowly in size in the earlier part of the test and at a high rate with the development of the radially elongate ones. Sutures are straight, depressed and radial on both sides of the test. The primary aperture is a medium-high arch that is equatorial in position, symmetrically extending into the umbilicus and bordered by a lip. Relict apertures can be present in the umbilical areas. Scattered pustules are present on the earlier chambers of the test; the radially elongate chambers are commonly smooth. Test wall calcitic, hyaline, finely perforate; pore diameter is in the range of 1.0 to 1.8 microns.

Entries in the Catalog of original descriptions: Hastigerinoides atlanticus

Geological Range:
Last occurrence (top): within D. asymetrica zone (83.65-85.60Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): within D. concavata zone (85.60-89.75Ma, base in Turonian 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: Hastigerinoides

Hastigerinoides atlanticus compiled by the pforams@mikrotax project team viewed: 7-10-2026 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110231 Go to Archive.is to create a permanent copy of this page - citation notes

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