| Daughter taxa: (blue => in age window 0-800Ma) | ||||
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| 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
Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): within Maastrichtian Stage (66.04-72.05Ma, base in Maastrichtian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Dec 2017 - Plotting of Neptune data has been re-enabled on the Mesozoic pages following revision of the age-models in Neptune. The data is, however, still very sparse for the Early Cretaceous
References:
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Zeauvigerina compiled by the pforams@mikrotax project team viewed: 5-4-2020
Short stable page link: http://mikrotax.org/pforams/index.php?id=110581 Go to Archive.is to create a permanent copy of this page - citation notes |