Globigerinoides parawoodi

NB TAXA WHICH ORIGINATE IN THE OLIGOCENE ARE NOT INCLUDED YET
Classification: pf_neogene -> Globigerinidae -> Globigerinoides -> Globigerinoides parawoodi
Sister taxa: G. altiaperturus, G. conglobatus, G. diminutus, G. elongatus, G. extremus, G. mitra, G. obliquus, G. parawoodi, G. ruber, G. seigliei, G. subquadratus, G. tenellus, G. white,

Taxonomy

Citation: Globigerinoides parawoodi Keller 1981
Rank: species
Basionym: Globigerinoides parawoodi

Catalog entries: Globigerinoides parawoodi;

Type images:

Description


Diagnostic characters: Low trochospiral, chambers spherical to ovate

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


Wall type: Spinose; Cancellate [Aze 2011]

Test morphology: Test low trochospire, chambers spherical to ovate, four in the final whorl; distinct radial sutures on both umbilical and spiral sides, depressed, surface coarsely pitted as in Globigerina (Zeaglobigerina) woodi; primary aperture a medium-sized arch, interiomarginal, umbilical, with a distinct rim-like margin; one small supplementary aperture at the suture junction between the ultimate and penultimate chambers. [Kennett & Srinivasan 1983]

Biogeography and Palaeobiology


Geographic distribution: Temperate [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)

Phylogenetic relations:

Gs. parawoodi is similar to Globigerina woodi in all aspects except for the development of a small supplementary aperture. This species differs from Gs. altiapertura by its small, single supplementary aperture, generally smaller primary aperture, and smaller test size. Gs. bollii is distinguished from Gs. parawoodi by its heavily encrusted and more compact test and by possessing more than one supplementary aperture. [Kennett & Srinivasan 1983]

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within N7 zone (16.38-17.54Ma, top in Burdigalian stage). Data source: Kennett & Srinivasan 1983
First occurrence (base): within N4b zone (22.20-23.50Ma, base in Chattian stage). Data source: Kennett & Srinivasan 1983

Plot of occurrence data:

Primary source for this page: Kennett & Srinivisan 1983, p.70

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.

Keller, G., (1981). Origin and evolution of the genus Globigerinoides in the Early Miocene of the northwestern Pacific, site 292,. Micropaleontology, 27(3): 293-304.

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 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.


Globigerinoides parawoodi compiled by the pforams@mikrotax project team viewed: 26-6-2017

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