Muricohedbergella


Classification: pf_cenozoic -> Globanomalidae -> Muricohedbergella
Sister taxa: Globanomalina, Muricohedbergella, Planoglobanomalina, Pseudohastigerina, Turborotalia,
Daughter taxa: (blue => in age window 0-300Ma)
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

Taxonomy

Citation: Muricohedbergella Huber & Leckie 2011
Rank: Genus
Type species: Anomalina lorneiana d'Orbigny var. trochoidea Gandolfi, 1942.
Synonyms: The Paleocene species included in this genus have normally been placed in Hedbergella Brönnimann & Brown 1958 but following revision of Cretaceous hedbergellids they are now placed in Muricohedbergella Huber & Leckie 2011.
Taxonomic discussion: Late Cretaceous species of Hedbergella are generally typified by more numerous chambers in the ultimate whorl and by more pustulose chambers. The late Maastrichtian species Hedbergella holmdelensis and H. monmouthensis, however, show a reduced number of chambers in the ultimate whorl and less pustulose chambers. [Olsson et al. 1999]

Catalog entries: Hedbergella;

Type images:

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.

NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus.
They are being edited as the site is developed and comments on them are especially welcome.

Description


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.

Biogeography and Palaeobiology

Biostratigraphic distribution

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): at base of Maastrichtian Stage (0% up, 72.1Ma, in Maastrichtian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Brönnimann, P. & Brown, N.K., (1958). Hedbergella, a new name for a Cretaceous planktonic foraminiferal genus. J. Washington Acad. Sci., 48: 15-17.

Gandolfi, R., (1942). Ricerche micropaleontologiche e stratigraphfiche sulla Scaglia e sul flysch Cretacici dei Dintorni di Balerna (Canton Ticino). Rivista Italiana Paleontologia, 48: 1-160.

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.


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Muricohedbergella compiled by the pforams@mikrotax project team viewed: 15-12-2018

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