Praeglobotruncana plenusiensis

Taxonomy

Original description: Medium to large-sized low trochospiral test; suboval outline, strongly asymmetrical profile with flat spiral side and strongly convex umbilical side; equatorial periphery moderately lobate, 4 to 5 chambers in the last whorl. Spiral side with crescent-shaped to petaloid chambers growing slowly in size as added; chamber surface is flat and smooth; spiral sutures are curved, marked by aligned pustules to keeled throughout the penultimate and ultimate whorl with the exception of the suture between the last two chambers, which is weakly raised to depressed. Umbilical side with subglobular to subtrapezoidal chambers and straight and depressed sutures; umbilical area relatively small about 1/3 to 1/4 of the maximum diameter; primary aperture extraumbilical-umbilical. Lateral profile with a thick imperforate peripheral band that is shifted toward the spiral side and disappears toward the end of the last whorl; the imperforate peripheral band is marked by pustules that are randomly distributed along the equatorial pe- riphery. The last chamber is typically inflated in edge view and forms an angle of nearly 90 to the imperforate peripheral band. Wall texture macroperforate.

Entries in the Catalog of original descriptions: Praeglobotruncana plenusiensis

Geological Range:
Notes: Confined to Plenus Marl beds 2 to 4 according to Falzoni & Petrizzo (2020), i.e. a short interval within OAE2, just below the C/T boundary
Last occurrence (top): near base of W. archaeocretacea zone (10% up, 94Ma, in Cenomanian stage). Data source: Falzoni & Petrizzo 2020
First occurrence (base): near top of R. cushmani zone (90% up, 94.5Ma, in Cenomanian stage). Data source: Falzoni & Petrizzo 2020

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: Praeglobotruncana

Praeglobotruncana plenusiensis compiled by the pforams@mikrotax project team viewed: 20-9-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110595 Go to Archive.is to create a permanent copy of this page - citation notes

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