Daughter taxa: (blue => in age window 0-800Ma) | ||||
![]() | ![]() | ![]() | Final whorl chambers ovate, elongated, compressed; test almost planispiral. | |
![]() | ![]() | Final whorl chambers inflated and rapidly increase in size; periphery distinctly lobulate . | ||
Specimens which cannot be assigned to established species |
Catalog entries: Hedbergella
Distinguishing features: Low to very low trochospiral. Chambers globular, 5-8 in final whorl. Umbilicus small & deep.
Aperture low to high arch, with narrow lip.
Normal perforate wall, smooth to heavily pustulose, nonspinose.
Diagnostic characters: Test low to very low trochospiral with 18 or more globular chambers. Number of chambers in ultimate whorl varing from 5 to 8. Aperture interiomarginal, umbilical-extraumbilical, a low to high arch, bordered by a narrow lip. Umbilicus small, deep, and open to apertures of previous chambers. Normal perforate wall, smooth to heavily pustulose, nonspinose.
Geological Range:
Last occurrence (top): within Danian Stage (61.61-66.04Ma, top in Danian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Campanian Stage (64% up, 76.2Ma, in Campanian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Brönnimann, P. & Brown, N. K. (1958). Hedbergella, a new name for a Cretaceous planktonic foraminiferal genus. Journal of the Washington Academy of Sciences. 48: 15-17. gs Gandolfi, R. (1942). Ricerche micropaleontologiche e stratigraphfiche sulla Scaglia e sul flysch Cretacici dei Dintorni di Balerna (Canton Ticino). Rivista Italiana di Paleontologia. 48: 1-160. gs Huber, B. T. & Leckie, R. M. (2011). Planktic foraminiferal species turnover across deep-sea Aptian/Albian boundary sections. Journal of Foraminiferal Research. 41: 53-95. gsReferences:
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Muricohedbergella compiled by the pforams@mikrotax project team viewed: 16-12-2019
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