Zeauvigerina

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

Taxonomy

Original description: Genus similar to Eouvigerina in size, biserial arrangement of most chambers and spout-like uvigerine aperture, but differing in first and last stages. The early chambers show not the slightest trace, even in the microspheric form, of spiroplectine coiling; the final chambers have no tendency to become irregularly triserial, the whole test being regularly bolivine throughout.

The general similarities to Eouvigerina (especially of the aspera and gracilis type, which have somewhat the same ornament) are so marked that close relationship must surely exist. If so, the elision of the theoretical coiled early chambers and the more settled and compact development throughout is probably due to the later appearance in time of this genus, Eouvigerina proper being an Upper Cretaceous form, while the New Zealand development is Upper Middle Eocene.

Entries in the Catalog of original descriptions: Zeauvigerina

Distinguishing features:
Parent taxon (Heterohelicidae): Aperture symmetrical, ranging from a low slit to a high arch at the base of the final chamber, becoming terminal in uniserial taxa.
This taxon: Test biserial until final chamber, which becomes or shows a tendency to become uniserial

Geological Range:
Last occurrence (top): at top of Danian Stage (100% up, 61.6Ma, in Selandian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within A. mayaroensis zone (67.64-69.27Ma, base in Maastrichtian 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: Heterohelicidae

Zeauvigerina 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=110581 Go to Archive.is to create a permanent copy of this page - citation notes

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