Globorotaliamonmouthensis Olsson, 1960:47, pl. 9: figs. 22-24 [upper Maastrichtian, Redbank Fm., New Jersey].
Hedbergellamonmouthensis (Olsson).—Olsson, 1964:160, pl. 1: fig. 3a-c [upper Maastrichtian, Redbank Fm., New Jersey].—Sliter, 1976:542, pl. 3: figs. 1-3 [Maastrichtian, DSDP Hole 327A/12/1: 69-72 cm; eastern Falkland Plateau, South Atlantic Ocean].—Huber, 1990:503, pl. 2: figs. 6-8, pl. 6: fig. 2 [Maastrichtian, ODP Hole 690C/20X/5: 108-110 cm; Maud Rise, Southern Ocean]; 1991a:292, pl. 1: figs. 2, 3 [Abathomphalusmayaroensis Zone, ODP Hole 698A/16R/2: 67-71 cm; northeast Georgia Rise, South Atlantic Ocean]; 1994:22, pl. 2: figs. 9-16 [upper Maastrichtian, Redbank Fm., New Jersey], [Olsson et al. 1999]
Taxonomic discussion: Liu and Olsson (1994) showed that a variety of morphotypes existed within an assemblage of H. monmouthensis. This species is regarded as ancestral to the normal perforate cancellate species of the earliest Danian, which also have the general shape of these morphotypes. Thus, it is believed that these variations may have established trends that resulted in the separation of the Paleocene globigerinids and globorotaliids. Very primitive pore pits can be observed in the chamber walls of H. monmouthensis. In the earliest Danian this character was strongly developed, resulting in the cancellate wall texture that is the most important distinguishing feature of Cenozoic planktonic foraminifera. Two important cancellate groups of planktonic foraminifera are derived from H. monmouthensis, cancellate spinose and cancellate nonspinose. Eoglobigerina and Parasubbotina represent the first of the cancellate spinose genera, and Praemurica represents the first of the cancellate nonspinose genera. A discussion of these transitions is given in Liu and Olsson (1994). [Olsson et al. 1999]
Recombined as Muricohedbergella monmouthensis 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 inflated and rapidly increase in size; periphery distinctly lobulate .
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:
Inequally biconvex
aperture:
Extraumbilical-peripheral
sp chamber shape:
Inflated
coiling axis:
Very low
periphery:
N/A
aperture border:
Thick lip
umb chbr shape:
Inflated
umbilicus:
Narrow
periph margin shape:
Broadly rounded
accessory apertures:
None
spiral sutures:
Strongly depressed
umb depth:
Deep
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 distributionWorldwide in the high and lower latitudes (Figure 14). [Olsson et al. 1999]
Aze et al. 2011 summary: Cosmopolitan; based on Olsson et al. (1999) Isotope paleobiologyHedbergellamonmouthensis has among the most positive δ18O of any Cretaceous trochospiral planktic foraminifer (Boersma et al., 1979). The δ18O of H. monmouthensis is similar to Abathamphalus mayaroensis and is distinctly more positive than Rugoglobigerinarotundata, R. rugosa, Globotruncanellapetaloidea, and Globotruncana area (Berggren and Norris, 1997). The δ13C of H. monmouthensis is lighter than coexisitng Rugoglobigerina. [Olsson et al. 1999] Aze et al. 2011 ecogroup 3 - Open ocean thermocline. Based on light _13C and relatively heavy _18O. Sources cited by Aze et al. 2011 (appendix S3): Berggren & Norris (1997) Phylogenetic relationsThe species originates in the upper Maastrichtian from H. holmdelensis. [Olsson et al. 1999]
Most likely ancestor:Muricohedbergella holmdelensis - at confidence level 3 (out of 5). Data source: Olsson et al. 1999.
Biostratigraphic distribution
Geological Range: Notes: Upper 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 G. gansseri zone (71.73-73.80Ma, 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:
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 monmouthensis compiled by the pforams@mikrotax project teamviewed: 7-2-2025
neotype: G. monmouthensis
topotype: G. monmouthensis
topotype: G. monmouthensis
topotype: G. monmouthensis
topotype: G. monmouthensis
x: G. monmouthensis
x: G. monmouthensis
neotype: G. monmouthensis
topotype: G. monmouthensis
topotype: G. monmouthensis
topotype: G. monmouthensis
topotype: G. monmouthensis
x: G. monmouthensis
x: G. monmouthensis
