Taxonomy
Original description: Test consisting of two unequal portions, the early portion consisting of several pairs of globular chambers arranged as in Guembelina, the adult stage uniserial, formed usually by three subglobular or slightly pyriform chambers, slightly overlapping, the apertural end extended out into a tapering neck; sutures distinct, depressed; wall smooth, translucent, very finely perforate; aperture circular, at the end of the tubular neck.
Entries in the Catalog of original descriptions: Rectoguembelina cretacea
Character matrix
test outline: | Elongate | chamber arrangement: | Biserial | edge view: | Equally biconvex | aperture: | Terminal |
sp chamber shape: | Inflated | coiling axis: | N/A | periphery: | N/A | aperture border: | N/A |
umb chbr shape: | Inflated | umbilicus: | N/A | periph margin shape: | Broadly rounded | accessory apertures: | N/A |
spiral sutures: | Moderately depressed | umb depth: | N/A | wall texture: | Smooth | shell porosity: | |
umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 1-2 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): within P2 zone (62.29-62.60Ma, top in Danian stage). Data source: [copied from Chronos database]
First occurrence (base): within A. mayaroensis zone (67.64-69.27Ma, base in Maastrichtian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
Cushman, J. A. (1932). Rectoguembelina, a new genus from the Cretaceous. Contributions from the Cushman Laboratory for Foraminiferal Research. 8(1): 4-7. gs References:
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Rectoguembelina cretacea compiled by the pforams@mikrotax project team viewed: 26-4-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=110490 Go to Archive.is to create a permanent copy of this page - citation notes |
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