Planomalina praebuxtorfi

Taxonomy

Original description: "Test planispiral, rather deeply umbilicate, equatorial periphery subangular to angular, lobulate in outline, with either a keel or irregular rugosities or both, wich only occur on the earlier part of the last whorl. The last 2 or more chambers are unornamented. Sutures depressed, curved, bordered at their posterior side by more or less well-developed rugosities on the earlier part of the last whorl, thus giving the impression of being raised. At least the last suture remains unornamented. Chambers rounded triangular in apertural view, reniform in lateral view. There are 6-8, mostly 7 chambers in the last whorl, increasing gradually in size as added. Aperture an equatorial arch, interiomarginal in position, extending on either side into the umbilicus and backwards to the spiral suture, and bordered by a distinct lip. The lateral umbilical extensions of earlier apertures remain visible as relict apertures with their lips. Wall perforate, covered with small pustules, which, in the earlier part of the last whorl, tend to concentrate to form a keel and raised sutures."

Entries in the Catalog of original descriptions: Planomalina praebuxtorfi

Most likely ancestor: Planomalina pulchella - at confidence level 3 (out of 5). Data source: Huber et al. 2022.
Likely descendants: Planomalina buxtorfi; plot with descendants

Geological Range:
Last occurrence (top): within P. appenninica zone (100.50-101.92Ma, top in Albian stage). Data source: Huber et al. 2022
First occurrence (base): within P. appenninica zone (100.50-101.92Ma, base in Albian 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: Planomalina praebuxtorfi, synonyms included - Planomalina praebuxtorfi;
• See also space-time plot :: Samples map :: Parent: Planomalina

Planomalina praebuxtorfi compiled by the pforams@mikrotax project team viewed: 7-12-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110414 Go to Archive.is to create a permanent copy of this page - citation notes

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