Daughter taxa: (blue => in age window 0-800Ma) | ||||
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Specimens which cannot be assigned to established species |
Taxonomy
Original description:
Diagnosis. Smooth, very low trochospiral test, finely perforate to macroperforate test wall, crater-like pores on the earlier chambers and imperforate peripheral band throughout the final whorl.
Description. Test low to very low trochospiral with globular to subglobular chambers, separated by straight, incised and radial sutures. Test biconvex, nearly symmetrical in edge view. Periphery broadly rounded with a wide imperforate band throughout the final whorl. Main aperture is in the shape of a low to medium high arch, peripheral-umbilical in position and bordered by an imperforate lip. Test wall calcitic, hyaline, perforate, with perforation diameters ranging between 1.7 and 3.1 mm. Test surface smooth.
Entries in the Catalog of original descriptions: Liuella, Liuenella
Distinguishing features: Smooth, very low trochospiral test, finely perforate to macroperforate test wall, crater-like pores on the earlier chambers and imperforate peripheral band throughout the final whorl.
Geological Range:
Last occurrence (top): within Campanian Stage (72.05-83.64Ma, top in Campanian stage). Data source: Total of range of species in this database
First occurrence (base): within Santonian Stage (83.64-86.26Ma, base in Santonian 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
Georgescu, M. D. (2008a). A new planktonic foraminifer (Family Hedbergellidae Loeblich and Tappan, 1961) from the lower Campanian sediments of the Falkland Plateau, South Atlantic Ocean (DSDP Site 511). Journal of Foraminiferal Research. 38: 157-161. gs Georgescu, M. D. (2010a). Liuenella, new name for Liuella Georgescu, 2008. Journal of Foraminiferal Research. 40: 206-. gsReferences:
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Liuenella compiled by the pforams@mikrotax project team viewed: 15-12-2019
Short stable page link: http://mikrotax.org/pforams/index.php?id=110315 Go to Archive.is to create a permanent copy of this page - citation notes |