Taxonomy
Original description: Test wall microperforate, circular pores 0.3 to 0.7 um, surface with weakly developed and randomly scattered perforation cones, small pustules may occur in the umbilical region. Test small, globular with early hedbergellid stage, overall diameter/width ratio averaging 1.14; chambers increasing gradually to moderately in size, 11 to 13 coiled in a variable trochospire, 4.5 to 5.0 subglobular chambers in the initial whorl and three to four globular chambers in the final whorl; sutures are depressed, straight to slightly curved; aperture is a low to moderate, semicircular interiomarginal arch at the base of the final chamber, without periapertural structures.
Entries in the Catalog of original descriptions: Pseudoguembelitria blakenosensis
Character matrix
test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Spiroconvex | aperture: | Interiomarginal |
sp chamber shape: | Globular | coiling axis: | Moderate-high | periphery: | N/A | aperture border: | N/A |
umb chbr shape: | Globular | umbilicus: | Wide | periph margin shape: | Broadly rounded | accessory apertures: | None |
spiral sutures: | Moderately depressed | umb depth: | Shallow | wall texture: | Perforation cones | shell porosity: | Microperforate: <1µm |
umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 3-4 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): at top of Paraticinella rohri zone (99% up, 113.3Ma, in Aptian stage). Data source: Huber and Leckie, 2011
First occurrence (base): near base of Hedbergella infracretacea zone (10% up, 116.8Ma, in Aptian stage). Data source: Huber and Leckie, 2011
Plot of range and occurrence data:
Huber, B. T. & Leckie, R. M. (2011). Planktic foraminiferal species turnover across deep-sea Aptian/Albian boundary sections. Journal of Foraminiferal Research. 41: 53-95. gsReferences:
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Pseudoguembelitria blakenosensis compiled by the pforams@mikrotax project team viewed: 27-4-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=110460 Go to Archive.is to create a permanent copy of this page - citation notes |
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