Taxonomy
Original description: Test is biserial throughout and consists of 11 to 15 chambers. Small proloculus (8.2-14.3 microns) is followed by slightly larger second chamber. Chambers increase gradually in size as added. Earlier chambers are subglobular, those of adult stage are reniform and oblique to the test axis of growth. Sutures are distinct, depressed, and oblique. Tests are symmetrical in edge view, with broadly rounded periphery. Aperture is medium to high arch at base of lastformed chamber; it is bordered by two symmetrically developed periapertural flanges . Chamber surface is ornamented with closely spaced costae, each of them consisting of series of aligned pustules, resulting in a granular appearance. Test wall is calcitic, hyaline, microperforate; pore diameter ranges 0.5-0.9 microns.
Entries in the Catalog of original descriptions: Planoheterohelix postmoremani
Character matrix
| test outline: | Triangular | chamber arrangement: | Biserial | edge view: | Compressed | aperture: | Interiomarginal |
| sp chamber shape: | Reniform | coiling axis: | N/A | periphery: | N/A | aperture border: | Thin flange |
| umb chbr shape: | Reniform | umbilicus: | N/A | periph margin shape: | Broadly rounded | accessory apertures: | N/A |
| spiral sutures: | Moderately depressed | umb depth: | N/A | wall texture: | Finely costate | shell porosity: | Microperforate: <1µm |
| 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 D. concavata zone (85.60-89.75Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): within R. cushmani zone (94.03-98.69Ma, base in Cenomanian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
Georgescu, M. D. & Huber, B. T. (2009). Early evolution of the Cretaceous serial planktic foraminifera (late Albian-Cenomanian). Journal of Foraminiferal Research. 39: 335-360. gsReferences:

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Planoheterohelix postmoremani compiled by the pforams@mikrotax project team viewed: 8-2-2026
Short stable page link: https://mikrotax.org/pforams/index.php?id=110407 Go to Archive.is to create a permanent copy of this page - citation notes |
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