Classification: pf_mesozoic -> Heterohelicidae -> Pseudoguembelina
Sister taxa: Heterohelix, Spiroplecta, Braunella, Hendersonites, Huberella, Laeviheterohelix, Planoheterohelix, Protoheterohelix, Pseudoguembelina, Pseudotextularia, Planoglobulina, Ventilabrella, Gublerina, Praegublerina, Sigalia, Racemiguembelina, Lunatriella, Rectoguembelina, Zeauvigerina,
Daughter taxa: (blue => in age window 0-800Ma)

Specimens which cannot be assigned to established species


Citation: Pseudoguembelina Bronnimann and Brown 1953
Rank: Genus
Basionym: Guembelina excolata
Type species: Guembelina excolata Cushman, 1926

Original description: Definition. - The tapering calcareous test is composed of biserially staggered, globular to subglobular chambers as in the genus Guembelina [Egger]. A pointed unlobulated initial end consists of minute chambers, followed by a lobated stage with considerably larger and more-inflated chambers. The chambers may become laterally compressed in the last stage. The principal aperture is an arched opening at the base of the inner margin of the ultimate chamber. In the lobated stage a minute accessory aperture is developed at the base near the median line on each side of each chamber. These apertures are covered by tiny valves or flaps. They are commonly damaged or filled with adherent matrix, and thus are not readily detected. Striations or costations (if present) are arranged longitudinally, following the contour of the chambers.
Family Heterohelicidae. Upper Cretaceous.

Entries in the Catalog of original descriptions: Pseudoguembelina

Distinguishing features: Biserial throughout, secondary sutural apertures along the median suture, partially covered by flaplike projections. Test usuually costate.

Diagnostic characters: Test subtriangular in outline, microspheric early stage may have tiny planispiral coil, remainder of test biserial, chambers somewhat inflated, sutures depressed; wall calcareous, low, and somewhat oblique imperforate longitudinal costae parallel the test periphery, intercostal surface perforate; aperture an interiomarginal arch, with secondary sutural apertures along the median zigzag suture between pairs of chambers, partially covered by very finely perforate tubular to flaring flaplike projections and may be bordered by a distinct imperforate lip.

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): within Turonian Stage (89.77-93.90Ma, base in Turonian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Dec 2017 - Plotting of Neptune data has been re-enabled on the Mesozoic pages following revision of the age-models in Neptune. The data is, however, still very sparse for the Early Cretaceous


Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gs


Pseudoguembelina compiled by the pforams@mikrotax project team viewed: 24-9-2020

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Short stable page link: http://mikrotax.org/pforams/index.php?id=110449 Go to Archive.is to create a permanent copy of this page - citation notes

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