Hedbergellaholmdelensis Olsson, 1964:160, holotype: pl. 1: fig. 2a-c; paratype: pl. 1: fig. l a - c [upper Maastrichtian, Navesink Fm., New Jersey].—Huber, 1994:18, pl. 2: figs. 1-8 [upper Maastrichtian, Navesink Fm., New Jersey]. [Olsson et al. 1999]
Taxonomic discussion: Hedbergellaholmdelensis is the ancestral species of the genus Globanomalina that first appears in Zone P0 of the basal Danian. Morphologically, H. holmdelensis is very similar to the first species of Globanomalina, G. archeocompressa. The key morphologic characters that phylogenetically link the two species are the small, compressed, smooth-walled test, the imperforate axial periphery, and the umbilical-extraumbilical aperture with its narrow lip. Hedbergellaholmdelensis retains two typical hedbergellid characters: the numerous, spherical-shaped chambers in the inner whorl, which is an adult character of the majority of hedbergellid species in the Cretaceous, and the pustulose surface of the test, which is distributed rather uniformly over the chambers, in contrast to the more restricted occurrence of pustules in Paleogene species of Globanomalina. Pustule growth, particularly in the umbilical area, is related to gametogenetic calcification in smooth-walled species in the Cenozoic. Pustule growth in Hedbergella is largely unexplored, and its relationship to gametogenesis is unknown. Nevertheless, the difference in its distribution on the test suggests a different biological function for this genus than for Globanomalina. Globanomalina, however, is placed in the Hedbergellidae to reflect its phylogenetic linkage with this important Cretaceous group of planktonic foraminifera. [Olsson et al. 1999]
Reombinedas Muricohedbergella homldelenesis by Huber & Leckie 2011
Distinguishing features: Parent taxon (Muricohedbergella): 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. This taxon: Final whorl chambers ovate, elongated, compressed; test almost planispiral.
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
Character matrix
test outline:
Lobate
chamber arrangement:
Trochospiral
edge view:
Equally biconvex
aperture:
Extraumbilical-peripheral
sp chamber shape:
Inflated
coiling axis:
Very low
periphery:
N/A
aperture border:
Thick lip
umb chbr shape:
Inflated
umbilicus:
Wide
periph margin shape:
Moderately rounded
accessory apertures:
None
spiral sutures:
Strongly depressed
umb depth:
Shallow
wall texture:
Finely pustulose
shell porosity:
Finely Perforate: 1-2.5µm
umbilical or test sutures:
Strongly depressed
final-whorl chambers:
5-6
N.B. These characters are used for advanced search. N/A - not applicable
Biogeography and Palaeobiology
Geographic distributionApparently worldwide in the high to low latitudes. [Olsson et al. 1999]
Aze et al. 2011 summary: Cosmopolitan; based on Olsson et al. (1999) Isotope paleobiologyNo data available [Olsson et al. 1999] Aze et al. 2011 ecogroup 3 - Open ocean thermocline; based on comparison with other species of the genus. Phylogenetic relationsThis species evolved in the Maastrichtian from a multichambered ancestor. [Olsson et al. 1999]
Biostratigraphic distribution
Geological Range: Notes: Lower Maastrichtian to lower Zone P0. [Olsson et al. 1999] Last occurrence (top): in lower part of P0 zone (40% up, 66Ma, in Danian stage). Data source: Olsson et al. 1999 First occurrence (base): within R. calcarata zone (75.06-75.91Ma, base in Campanian stage). Data source: Olsson et al. 1999
Plot of 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
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Muricohedbergella
Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 35
References:
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. gs
Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. (85): 1-252. gs
Muricohedbergella holmdelensis compiled by the pforams@mikrotax project teamviewed: 7-2-2025