Globorotalia plesiotumida


Classification: pf_cenozoic -> Globorotaliidae -> Globorotalia -> tumida lineage -> Globorotalia plesiotumida
Sister taxa: G. ungulata, G. flexuosa, G. tumida, G. plesiotumida, G. merotumida,

Taxonomy

Citation: Globorotalia plesiotumida Banner & Blow 1965
Rank: species
Basionym: Globorotalia (Globorotalia) tumida plesiotumida Blow & Banner, in Banner & Blow 1965
Synonyms:

Catalog entries: Globorotalia (Globorotalia) tumida plesiotumida

Type images:

Distinguishing features: Like G.merotumida but larger, slightly less convex umbilical side, more ovate equatorial profile, and final chamber is higher than wide.

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: Lenticular trochospiral, ovate periphery with keel

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


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

Test morphology: Test lenticular trochospire, biconvex, equatorial periphery ovate, slightly lob- ulate; axial periphery acute with a distinct keel; generally 6 chambers in the final whorl, increasing regularly in size as added, final chamber noticeably projecting; sutures on spiral side limbate , slightly raised, oblique to curved, merging into keel; on umbilical side radial, depressed; surface smooth, densely perforate, pustulate on umbillcal shoulders; umbilicus narrow, aperture a low arch, bordered by a lip, interiomarginal, umbilical-extraumbilical. [Kennett & Srinivasan 1983]

Character matrix

test outline:Ovatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Crescenticcoiling axis:Lowperiphery:Single keelaperture border:Thick lip
umb chbr shape:Subtriangularumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:None
spiral sutures:Raisedumb depth:Shallowwall texture:Smoothshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Weakly depressedfinal-whorl chambers:6.0-6.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Tropical to warm subtropical. [Kennett & Srinivasan 1983] Low latitudes [Aze et al. 2011, based on Kennett & Srinivasan (1983)]

[SCOR WG138]


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): Pearson & Shackleton (1995)

Phylogenetic relations:

Gr. (Gr.) plesiotumida is distinguished from Gr. (Gr.) tumida tumida by its smaller size and less tumid test. The evolutionary appearance of Gr. (Gr.) plesiotumida defines the base of Zone N17. This taxon, in turn, evolved into Gr. (Gr.) tumida tumida near the Zone N17-N18 boundary by developing a larger and more tumid test. [Kennett & Srinivasan 1983]

Most likely ancestor: Globorotalia merotumida - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983, fig 17;Stewart 2003 fig. 6.10; Aze et al. 2011, appendix 5.
Likely descendants: Globorotalia tumida;

Biostratigraphic distribution

Geological Range:
Last occurrence (top): near base of PL3 [Atl.] zone (12% up, 3.8Ma, in Piacenzian 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): at base of M13b subzone (0% up, 8.6Ma, in Tortonian stage). Data source: Wade et al. (2011), zonal marker

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.156

References:

Aze, T. et al. (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews. 86: 900-927. gs

Banner, F. T. & Blow, W. H. (1965c). Two new taxa of the Globorotaliinae (Globigerinacea, foraminifera) assisting determination of the late Miocene/middle Miocene boundary. Nature. 207(5004): 1351-1354. gs

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

Norris, R. D. (1998). Planktonic foraminifer biostratigraphy: Eastern Equatorial Atlantic. Proceedings of the Ocean Drilling Program, Scientific Results. 159: 445-479. gs

Pearson, P. N. & Shackleton, N. J. (1995). Neogene multispecies planktonic foraminifer stable isotope record, Site 871, Limalok Guyot. Proceedings of the Ocean Drilling Program, Scientific Results. 401-410. gs

Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. gs


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Globorotalia plesiotumida compiled by the pforams@mikrotax project team viewed: 9-12-2019

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