Chiloguembelina subtriangularis

Taxonomy

Catalog entries: Chiloguembelina subtriangularis

Distinguishing features:
Parent taxon (Chiloguembelina): Test subtriangular in outline, biserial throughout or rarely with multiserial final chambers; aperture a simple arched opening at base of the final chamber, with a narrow rim on one margin and a broad collar or flange directed toward one of the flat sides of the test, lacking an infolded margin or internal plate. Rarely with multiple apertures.
This taxon: Test small, biserial with subangular periphery, subtriangular in side view. Chambers, slightly inflated,broadening though ontogeny, successive chambers slightly overlapping the previous one. Sutures nearly straight, at low angle with the growth axis. Aperture low, asymmetric arch with lip that narrows toward the center of the chamber. 

Description

Biogeography and Palaeobiology

Most likely ancestor:
Chiloguembelina midwayensis - at confidence level 4 (out of 5). Data source: Olsson et al. 1999, f6.

Biostratigraphic distribution

Geological Range:
Notes: Zone Pic to Zone P3. [Olsson et al. 1999]
Last occurrence (top): within P3b subzone (60.73-61.33Ma, top in Selandian stage). Data source: Olsson et al. 1999
First occurrence (base): within P1c subzone (62.60-63.90Ma, base in Danian stage). Data source: Olsson et al. 1999

Plot of 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.
• Grey shading between taxa indicates intergrading species within an anagenetic lineage (data from Lamyman et al. 2026).
• Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
• Taxon plotted: Chiloguembelina subtriangularis, synonyms included - Chiloguembelina subtriangularis;
• See also space-time plot :: Samples map :: Parent: Chiloguembelina

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 92

Chiloguembelina subtriangularis compiled by the pforams@mikrotax project team viewed: 17-10-2026 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=100061 Go to Archive.is to create a permanent copy of this page - citation notes

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