pforams@mikrotax - Pseudoguembelina pforams@mikrotax - Pseudoguembelina


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 (time control age-window is: 0-800Ma)
Pseudoguembelina costellifera

Pseudoguembelina costulata

Pseudoguembelina excolata

Pseudoguembelina hariaensis

Pseudoguembelina kempensis

Pseudoguembelina palpebra

Pseudoguembelina praehariaensis
Long and narrow test with subparallel sides in the adult portion; final chamber vertically stretched and peripherally flattened.
Pseudoguembelina semicostata

Pseudoguembelina sp.
Specimens which cannot be assigned to established species


Citation: Pseudoguembelina Bronnimann and Brown 1953
taxonomic rank: Genus
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:
Parent taxon (Heterohelicidae): Aperture symmetrical, ranging from a low slit to a high arch at the base of the final chamber, becoming terminal in uniserial taxa.
This taxon: Biserial throughout, secondary sutural apertures along the median suture, partially covered by flaplike projections. Test usuually costate.

Geological Range:
Last occurrence (top): at top of P. hariaensis zone (100% up, 66.4Ma, in Maastrichtian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within H. helvetica zone (92.51-93.52Ma, base in Turonian stage). Data source: Total of ranges of species in this database

Plot of range and occurrence data:


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: 21-4-2024

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