Globigerinoides obliquus

Classification: pf_neogene -> Globigerinidae -> Globigerinoides -> Globigerinoides obliquus
Sister taxa: G. altiaperturus, G. bulloideus, G. conglobatus, G. diminutus, G. elongatus, G. extremus, G. mitra, G. obliquus, G. parawoodi, G. ruber, G. seigliei, G. subquadratus, G. white, G. sp.,


Citation: Globigerinoides obliquus Bolli, 1957
Rank: species
Basionym: Globigerinoides obliqua Bolli, 1957
Synonyms: Globigerinoides obliquus Bolli, 1957 (incorrect form but widely used)

Catalog entries: Globigerinoides obliqua;

Type images:

NB The short diagnoses are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus. They have initially been copied from the diagnostic characters/distinguishing features sections of the Eocene and Paleocene Atlases, they will be edited as the site is developed.


Diagnostic characters: Trochospiral, chambers spherical except final chamber which is compressed in a lateral oblique manner

Aperture: : Primary aperture interiomarginal umbilical highwide arch. Supplementary sutural apertures on spiral side [Aze 2011, based on Kennett & Srinivasan 1983]

Wall type: Spinose; Cancellate [Aze 2011]

Test morphology: Test trochospiral, chambers spher- ical except the final one,which is compressed in a lateral oblique manner, three to four in the final whorl increasing rapidly in size as added, sutures on spiral side radial to obliquely depressed, on umbilical side radial and depressed, surface distinctly pitted and per- forate; primary aperture a distinct, high , and wide arch, interiomarginal, umbilical; sec- ondary sutural aperture on last few chambers opposite the primary aperture. [Kennett & Srinivasan 1983]

Biogeography and Palaeobiology

Geographic distribution: Tropical to warm Subtropical. [Kennett & Srinivasan 1983]

Isotope paleobiology: Aze et al. 2011 ecogroup 1 - Open ocean mixed-layer tropical/subtropical, with symbionts. Based on very heavy ∂13C and relatively light ∂18O. Sources cited by Aze et al. 2011 (appendix S3): Keller (1985); Pearson et al. (2001b)

Phylogenetic relations: Gs. obliquus is distinguished by its obliquely oppressed later chamber. It evolved from Gs. altiapertura in Zone N5 (Early Miocene) by development of the last few chambers that are compressed in a lateral and oblique manner. [Kennett & Srinivasan 1983]

Most likely ancestor: Globigerinoides altiaperturus - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983, fig. 9.

Biostratigraphic distribution

Geological Range:
Last occurrence (top): in mid part of PT1a subzone (46% up, 1.3Ma, in Ionian stage). Data source: Wade et al. (2011), additional event; position within zone determined by linear interpolation from data in table 1 of Wade et al. (2011).
First occurrence (base): within N5 zone (17.59-21.12Ma, base in Aquitanian stage). Data source: Kennett & Srinivasan 1983

Plot of occurrence data:

Primary source for this page: Kennett & Srinivisan 1983, p.56


Aze, T.; Ezard, T.H.G.; Purvis, A.; Coxall, H.K.; Stewart, D.R.M.; Wade, B.S. & Pearson, P.N.P., (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews, 86: 900-927.

Bolli, H.M., (1957). Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, B.W.I. In: Loeblich, A.R., Jr. et al. (Editors), Studies in Foraminifera: U.S. National Museum Bulletin 215U.S. Government Printing Office, Washington, DC, pp. 97-123.

Keller, G., (1985). Depth stratification of planktonic foraminifers in the Miocene Ocean. In: Kennett, J.P. (Editor), The Miocene Ocean: Paleoceanography and Biogeography. GSA Memoir 163 The Geological Society of America, Boulder, Colorado, pp. 1-337.

Kennett, J.P. & Srinivasan, M.S., (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania, 1-265 pp.

Pearson, P.N.; Norris, R.D. & Empson, A., (2001). Mutabella mirabilis gen. et sp. nov., a Miocene microperforate planktonic foraminifer with an extreme level of intraspecific variability. Journal of Foraminiferal Research, 31: 120-132.

Pearson, P.N. & others, (2001). Warm tropical sea surface temperatures in the Late Cretaceous and Eocene epochs. Nature, 413: 481-487.


Globigerinoides obliquus compiled by the pforams@mikrotax project team viewed: 20-2-2018

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