Planomalina

Daughter taxa (time control age-window is: 0-800Ma)
			Planomalina buxtorfi
			Planomalina praebuxtorfi
			Planomalina pulchella
			Planomalina sp. Specimens which cannot be assigned to established species

Taxonomy

Original description: Test free, planispiral, partially evolute, so that earlier coils may be seen on both sides of the biumbilicate test; chambers numerous; sutures may be limbate; wall calcareous, coarsely perforate; apertnuor peripheral, an arch at the base of the aptertural face of the last-formed chamber, with a distinct lip. 

Entries in the Catalog of original descriptions: Planomalina

Distinguishing features:
Parent taxon (Planomalinidae): Test planispiral, biumbilicate, periphery carinate, sutures strongly arched; aperture a low equatorial opening.
This taxon: Test planispiral, partly evolute, biumbilicate, about eight to ten chambers in the final whorl, sutures broadly curved, thickened, elevated and nodose, peripheral outline lobulate, peripheral angle carinate; wall calcareous, finely perforate, radial in structure, ornamented by the thickened and nodose sutures and peripheral keel; aperture a basal equatorial arch with bordering lip, the opening extending to either side, where part of previous apertures and the bordering lip may remain exposed as relict apertures as the new chambers are added.

Geological Range:
Last occurrence (top): at top of P. appenninica zone (100% up, 100.5Ma, in Albian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within P. ticinensis zone (101.92-103.94Ma, base in Albian stage). Data source: Total of ranges of species in this 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
• Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Planomalinidae

Planomalina compiled by the pforams@mikrotax project team viewed: 5-10-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110412 Go to Archive.is to create a permanent copy of this page - citation notes

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