Globorotaliacompressa (Plummer).—Loeblich and Tappan, 1957a: 188, pl. 40: fig.5a-c [paratypic by synonymy, type Danian, Ostratorp], pl. 41: fig.5a-c [Zone Plb, McBryde Fm., Alabama] [in part, not pl. 42: fig. 5a-c, pl. 44: figs. 9, 10].
Globanomalinaplanocompressa Shutskaya.—Olsson, Hemleben, Berggren, and Liu, 1992:207, pl. 7: figs. 6-8 [Zone Pla, Clayton Basal Sands, Millers Ferry, Alabama]. [Olsson et al. 1999]
Taxonomic discussion: Although the original types are presumably lost, the meaning of this taxon seems clear from study of the Russian collections, and Blow's (1979) analysis of the species is followed herein. He based his analysis on the specimen figured by Loeblich and Tappan (1957a, pl. 40: fig. 5a-c), which became a paratype of this species when Shutskaya included this specimen in synonymy with her new species. Globanomalinaplanocompressa is the first member of the planocompressa -imitata -ovalis lineage, a lineage characterized by inflated, perforate-walled chambers. [Olsson et al. 1999]
Distinguishing features: Parent taxon (Globanomalina): Very low trochospiral; 5-6 chambers in final whorl; chamber-shape variable. Aperture interiomarginal, umbilical-extraumbilical, arch with narrow lip. Wall smooth, normally perforate, pustules in some species. This taxon: 5 chambers in the final whorl, increasing moderately in size. The chambers are more inflated than in G. archeocompressa and globular to ovoid.
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: The five chambers in the ultimate whorl increase moderately in size. The chambers are more inflated than in G. archeocompressa and globular to ovoid in shape. The pores which average 1 um at the narrowest point are evenly distributed in the chamber walls although some areas, especially on parts of the periphery, are imperforate. The wall ranges from 4 to 7 um in thickness. [Olsson et al. 1999]
Character matrix
test outline:
Circular
chamber arrangement:
Trochospiral
edge view:
Inequally biconvex
aperture:
Umbilical-extraumbilical
sp chamber shape:
Inflated
coiling axis:
N/A
periphery:
N/A
aperture border:
Thin lip
umb chbr shape:
Inflated
umbilicus:
Narrow
periph margin shape:
Broadly rounded
accessory apertures:
None
spiral sutures:
Strongly depressed
umb depth:
Deep
wall texture:
Smooth
shell porosity:
Finely Perforate: 1-2.5µm
umbilical or test sutures:
Strongly depressed
final-whorl chambers:
5-5
N.B. These characters are used for advanced search. N/A - not applicable
Biogeography and Palaeobiology
Geographic distributionKnown distribution in the northern hemisphere middle and low latitudes. [Olsson et al. 1999]
Aze et al. 2011 summary: Northern hemisphere and middle to low latitudes; based on Olsson et al. (1999) Isotope paleobiologyGlobanomalinaplanocompressa has δ18O and 5'3C similar to Parasubbotinapseudobulloides, S. triloculinoides, and E. eobulloides. The species has distinctly more positive δ18O and more negative δ13C than Praemurica and Woodringina. [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): Olsson et al. (1999) Phylogenetic relationsThis species originates in Zone Pa from G. archeocompressa by the inflation of chambers and the loss of an imperforate peripheral margin. It, in turn, gives rise to G. imitata in Zone Pic. [Olsson et al. 1999]
Geological Range: Notes: Upper Zone Pa to Zone Pic. [Olsson et al. 1999] Last occurrence (top): in mid part of P1c subzone (50% up, 63.3Ma, in Danian stage). Data source: Olsson et al. 1999, fig 5a First occurrence (base): in mid part of Pa zone (50% up, 65.9Ma, in Danian stage). Data source: Olsson et al. 1999, fig 5a
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
Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
Taxon plotted: Globanomalina planocompressa, synonyms included - Globanomalina planocompressa;
Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 44
References:
Blow, W. H. (1979). The Cainozoic Globigerinida: A study of the morphology, taxonomy, evolutionary relationships and stratigraphical distribution of some Globigerinida (mainly Globigerinacea). E. J. Brill, Leiden. 2: 1-1413. gs
Loeblich, A. R. & Tappan, H. (1957b). Planktonic foraminifera of Paleocene and early Eocene Age from the Gulf and Atlantic coastal plains. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin . 215: 173-198. gs
Olsson, R. K., Hemleben, C., Berggren, W. A. & Liu, C. (1992). Wall Texture Classification of planktonic foraminifera genera in the Lower Danian. Journal of Foraminiferal Research. 22(3): 195-213. 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
Shutskaya, E. K. (1965). Phylogenetic interrelationship of species of the Globorotalia compressa Plummer group in Danian time and the Paleocene Epoch. Voprosyi Mikropaleontologii. 9: 180-188. gs
Globanomalina planocompressa compiled by the pforams@mikrotax project teamviewed: 12-2-2026
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x: G. planocompressa
