Specimens which cannot be assigned to established species
| Daughter taxa (time control age-window is: 0-800Ma) | ||||
| | | Pseudoguembelina costellifera | |
| | | Pseudoguembelina costulata | |
| | | Pseudoguembelina excolata | |
| | | Pseudoguembelina hariaensis | |
| | | Pseudoguembelina kempensis | |
| | | Pseudoguembelina palpebra | |
| | | 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: Biserial throughout, secondary sutural apertures along the median suture, partially covered by flaplike projections. Test usuually costate.
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 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. gsReferences:
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Pseudoguembelina compiled by the pforams@mikrotax project team viewed: 19-4-2021
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 |