Taxonomy
Original description: Test biserial throughout or followed by one or two, rarely more, sets of small multiserial chamberlets. Biserial part of the test flaring throughout, or rapidly flaring in the juveniles, with sides of last few pairs of biserial chambers becoming subparallel. Biserial chambers subglobular, wider than high or deep, multiserial chamberlets globular. Periphery rounded, at most faintly lobate in the adult. Surface covered by thin, discontinuous costae, with rows of medium sized pores in between; sutures flush to slightly depressed, often imperforate. Apertures high and narrow arcs, bordered by small, but distinct flanges.
Entries in the Catalog of original descriptions: Pseudoguembelina hariaensis
Character matrix
test outline: | Subtriangular | chamber arrangement: | Multiserial | edge view: | Compressed | aperture: | Interiomarginal |
sp chamber shape: | Inflated | coiling axis: | N/A | periphery: | N/A | aperture border: | Thin lip |
umb chbr shape: | Inflated | umbilicus: | N/A | periph margin shape: | Moderately rounded | accessory apertures: | Sutural |
spiral sutures: | Moderately depressed | umb depth: | N/A | wall texture: | Finely costate | shell porosity: | Finely Perforate: 1-2.5µm |
umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 2-2 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): within P. hariaensis zone (66.39-67.64Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): at base of P. hariaensis zone (0% up, 67.6Ma, in Maastrichtian stage). Data source: zonal marker (from Timescale Creator)
Plot of range and occurrence data:
Huber, B. T., Tur, N., Self-Trail, J. & MacLeod, K. G. (2022a). Calcareous plankton biostratigraphic fidelity and species richness during the last 10 m.y. of the Cretaceous at Blake Plateau, subtropical North Atlantic. Cretaceous Research. 131: 1-42. gs Nederbragt, A. J. (1991). Late Cretaceous biostratigraphy and development of Heterohelicidae (planktic foraminifera). Micropaleontology. 37: 329-372. gsReferences:
Pseudoguembelina hariaensis compiled by the pforams@mikrotax project team viewed: 11-10-2024
Short stable page link: https://mikrotax.org/pforams/index.php?id=110453 Go to Archive.is to create a permanent copy of this page - citation notes |
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