pforams@mikrotax - Pseudoguembelitria pforams@mikrotax - Pseudoguembelitria

Pseudoguembelitria


Classification: pf_mesozoic -> Hedbergellidae -> Pseudoguembelitria
Sister taxa: Asterohedbergella, Clavihedbergella, Costellagerina, Falsotruncana, Hedbergella, Helvetoglobotruncana, Liuenella, Microhedbergella, Muricohedbergella, Paracostellagerina, Paraticinella, Praeglobotruncana, Pseudoguembelitria, Whiteinella
Daughter taxa (time control age-window is: 0-800Ma)
Pseudoguembelitria blakenosensis

Pseudoguembelitria sp.
Specimens which cannot be assigned to established species

Taxonomy

Citation: Pseudoguembelitria Huber and Leckie 2011
Rank: Genus
Type species: Pseudoguembelitria blakenosensis Huber and Leckie, 2011
Taxonomic discussion: Pseudoguembelitria differs from Hedbergella by having a higher trochospire, more weakly developed perforation cones on the test surface, and fewer chambers in the final whorl. It differs from Guembelitria Cushman, 1933 (late Campanian–early Paleocene) and Archaeoguembelitria Georgescu, 2009 (late Albian–early Turonian) by the early hedbergellid stage and variable trochospire, lower in the early stage and higher in the adult. It differs from Gubkinella (considered by Loeblich and Tapan [1987] to be a benthic foraminifer) in having perforation cones, moreinflated chambers, and a higher-arched aperture, and in lacking a lip.

Original description: Test wall microperforate with pores surrounded by small-sized perforation cones; pustules may be present in the umbilical region. Test small, with early hedbergellid stage and higher trochospire in the adult. Chambers coiled in a variable trochospire with 4.5–5.0 chambers in the initial whorl and 3–4 chambers in the final whorl. Aperture a low interiomarginal, umbilical-extraumbilical arch without periapertural structures

Entries in the Catalog of original descriptions: Pseudoguembelitria

Distinguishing features:
Parent taxon (Hedbergellidae): Test trochospirally coiled, primary aperture interiomarginal, extraumbilical-umbilical, with prominent apertural lip, apertures of earlier chambers remain visible around the umbilical region; no sutural secondary apertures.
This taxon: Test wall microperforate with pores surrounded by small-sized perforation cones; pustules may be present in the umbilical region. Test small, with early hedbergellid stage and higher trochospire in the adult. Chambers coiled in a variable trochospire with 4.5–5.0 chambers in the initial whorl and 3–4 chambers in the final whorl. Aperture a low interiomarginal, umbilical-extraumbilical arch without periapertural structures.

Geological Range:
Last occurrence (top): at top of Aptian Stage (98% up, 113.2Ma, in Aptian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Aptian Stage (55% up, 119Ma, in Aptian stage). Data source: Total of range of species in this database

Plot of range and occurrence data:

References:

Huber, B. T. & Leckie, R. M. (2011). Planktic foraminiferal species turnover across deep-sea Aptian/Albian boundary sections. Journal of Foraminiferal Research. 41: 53-95. gs


logo

Pseudoguembelitria compiled by the pforams@mikrotax project team viewed: 3-10-2023

Taxon Search:
Advanced Search

Short stables page link: https://mikrotax.org/pforams/index.php?id=110459 Go to Archive.is to create a permanent copy of this page - citation notes



Add Comment

* Required information
Captcha Image
Powered by Commentics

Comments

No comments yet. Be the first!