Pseudoguembelina

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

Taxonomy

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:

• 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
• Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Heterohelicidae

Pseudoguembelina compiled by the pforams@mikrotax project team viewed: 14-10-2024 Taxon Search: Advanced Search Short stable page link: https://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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