Planoheterohelix postmoremani

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

Geological Range:
Last occurrence (top): within D. concavata zone (86.71-89.91Ma, top in Coniacian stage). Data source: [copied from Chronos database]
First occurrence (base): within R. cushmani zone (94.03-95.94Ma, base in Cenomanian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Planoheterohelix

Planoheterohelix postmoremani compiled by the pforams@mikrotax project team viewed: 25-3-2023 Taxon Search: Advanced Search AphiaID: 1034737 Nomenclatural data on WoRMS Short stables 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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