Planohedbergella subcarinata

Taxonomy

Original description: The small, compressed and planispiral test has a lobate outline. The adult volution is composed of 5, rarely 6, much-compressed, subcarinate chambers. The last whorl is semi-involute, exposing in the shallow umbilici parts of the earlier chambers. The chambers are separated by rather deep and straight sutures. The end chamber is occasionally not larger or even smaller than the penultimate one. The outline of the individual chambers is elongate-ellipsoid in apertural and subcircular in lateral view. Early ontogenetic chambers are rounded peripherally, similar to those of the subspecies Globigerinella messinae subsp. messinae Bronnimann. The large arcuate aperture is situated equatorially at the base of the end chamber and is provided with a delicate, indistinct lip-like projection. The walls appear to be thin and finely perforate. Minute papillae are evenly distributed over the surface. The ornamentation is stronger in the early stage of the last volution."

Entries in the Catalog of original descriptions: Globigerinella messinae subcarinata

Most likely ancestor: Planohedbergella messinae - at confidence level 3 (out of 5). Data source: Huber et al. 2022 fig. 2.

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 D. asymetrica zone (83.65-85.60Ma, base in Santonian stage). Data source: Huber et al 2022

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: Planohedbergella subcarinata, synonyms included - Globigerinelloides subcarinatus; Globotruncanella subcarinatus;
• See also space-time plot :: Samples map :: Parent: Planohedbergella

Planohedbergella subcarinata 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=110147 Go to Archive.is to create a permanent copy of this page - citation notes

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Comments (1)

 

 

 

 

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Maria Rose

Posts: 1

Since: Jan 2017

Maria Rose(Italy)

THANK YOU SO MUCH!!!

16 November 2016 15:48

 

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