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&Leckie 2011
taxonomic 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 Paraticinella rohri zone (100% up, 113.2Ma, in Albian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Hedbergella infracretacea zone (116.60-116.86Ma, base in Aptian stage). Data source: Total of ranges 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


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Pseudoguembelitria compiled by the pforams@mikrotax project team viewed: 14-12-2024

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