Globorotalia flexuosa

NB TAXA WHICH ORIGINATE IN THE OLIGOCENE ARE NOT INCLUDED YET
Classification: pf_neogene -> Globorotalidae -> Globorotalia -> tumida lineage -> Globorotalia flexuosa
Sister taxa: G. flexuosa, G. merotumida, G. plesiotumida, G. tumida, G. ungulata, G. zealandica,

Taxonomy

Citation: Globorotalia flexuosa (Koch 1923)
Rank: species
Basionym: Pulvinulina tumida var. flexuosa Koch 1923
Synonyms:

Catalog entries: Pulvinulina tumida flexuosa;

Type images:

Description


Diagnostic characters: Large, trochospiral, equatorial periphery oval to elongate, final chamber bent sharply to umbilicus, heavy keel

Aperture: : Interiomarginal umbilical-extraumbilical low arch bordered by plate-like lip [Aze 2011, based on Kennett & Srinivasan 1983]


Wall type: Non-spinose; Smooth [Aze 2011]

Test morphology: Test large , trochospiral, equatorial periphery oval to elongate; axial periphery acute with a heavy keel, anterior rim of the final chamber bent sharply toward umbilicus; chambers 6 to 7 in the final whorl , with the last chamber showing extreme elongation and infolding of the anterior part toward the umbilicus; spiral sutures limbate, raised, oblique merging with the keel, umbilical sutures sinuously radial, depressed; surface smooth, densely perforate, heavily pustulate on umbil- ical shoulders; umbilicus narrow , deep ; aperture interiomarginal, umbilical-extraumbilical, a low arch bordered by a platelike lip. [Kennett & Srinivasan 1983]

Biogeography and Palaeobiology


Geographic distribution: Tropical. [Kennett & Srinivasan 1983]

Isotope paleobiology: 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 Sources cited by Aze et al. 2011 (appendix S3): D. R. M. Stewart unpublished data

Phylogenetic relations: Gr. (Gr.) tumida flexuosa is similar in all respects with Gr. (Gr.) tumida tumida except for the sharp bend of the anterior part of the final chamber toward the umbilicus.
Gr. (Gr.) tumida flexuosa differs from Globorotalia menardii neoflexuosa Srinivasan, Kennett, and Be in having narrower and more elliptical outline, less lobulate periphery, and a heavy keel. [Kennett & Srinivasan 1983]

Biostratigraphic distribution

Geological Range:
Last occurrence (top): near top of PT1b subzone (89% up, 0.1Ma, in "Holocene" 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): in lower part of PT1b subzone (34% up, 0.4Ma, 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).

Plot of occurrence data:

Primary source for this page: Kennett & Srinivisan 1983, p.158

References:

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.

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

Koch, R., (1923). Die jungtertiare Foraminiferenfauna von Kabu (Res. Surbaja Java). Eclogae Geologicae Helvetiae, 18: 342-357.

Wade, B.S.; Pearson, P.N.; Berggren, W.A. & Pälike, H., (2011). Review and revision of Cenozoic tropical planktonic foraminiferal biostratigraphy and calibration to the geomagnetic polarity and astronomical time scale. Earth-Science Reviews, 104: 111-142.


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Globorotalia flexuosa compiled by the pforams@mikrotax project team viewed: 26-9-2017

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AphiaID: 1026406 Nomenclatural data on WoRMS
Go to Archive.is to create a permanent copy of this page - citation notes



AphiaID: 1026406 Nomenclatural data on WoRMS
Go to Archive.is to create a permanent copy of this page - citation notes

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