Globigerinoides kennetti


Classification: pf_cenozoic -> Globigerinidae -> Globigerinoides -> Globigerinoides kennetti
Sister taxa: G. elongatus, G. extremus, G. conglobatus, G. eoconglobatus, G. obliquus, G. altiaperturus, G. joli, G. neoparawoodi, G. kennetti, G. bollii, G. italicus, G. ruber, G. mitra, G. seigliei, G. subquadratus, G. diminutus, G. bulloideus, G. sp.,

Taxonomy

Citation: Globigerinoides kennetti (Keller & Poore 1980)
Rank: species
Basionym: Globigerinoides kennetti Keller & Poore 1980
Taxonomic discussion: Inclusion of G. kennetti  in Globoturborotalita follows Aze et al. 2011.

Catalog entries: Globigerinoides kennetti

Type images:

Distinguishing features: Like Gs. bolli but only 3 to 3½ chambers in final whorl (vs. 4), less-embracing chambers, and more subquadrate outline

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: Low spired, spherical to subspherical chambers

Aperture: Primary aperture centred over suture of final and penultimate chambers. Supplementary sutural apertures on spiral side [Aze 2011, based on Kennett & Srinivasan 1983]


Wall type: Spinose; Cancellate [Aze 2011]

Test morphology: Test small, low spired, spherical to subspherical chambers, three in the final whorl; sutures distinct and incised; umbilicus small, primary aperture centered over the suture between the penultimate and antepenultimate chambers; small, supplementary apertures on the spiral :side at sutural junctions; surface heavily encrusted, but spine bases can be seen on the final chamber, indicating a spinose test (Pl. 10, Fig. 5). [Kennett & Srinivasan 1983]

Character matrix

test outline:Ovatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Low-moderateperiphery:N/Aaperture border:N/A
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:Sutural
spiral sutures:Strongly depressedumb depth:Deepwall texture:Cancellateshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:3.0-3.5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


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

[SCOR WG138]

Warm to cool subtropical.

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:

Close morphological similarities between Gs. kennetti and Gs. bollii suggest that they are closely related. [Kennett & Srinivasan 1983]


Similar species: Gs. kennetti differs from Gs. bollii in having 3 to 3½ chambers instead of 4 in the final whorl, less-embracing chambers, and more subquadrate outline. [Kennett & Srinivasan 1983]

Most likely ancestor: Globigerinoides bollii - at confidence level 2 (out of 5). Data source: Kennett & Srinivasan, fig. 9, p.70; Aze et al. 2011.

Biostratigraphic distribution

Geological Range:
Notes: Zone N16 to Zone N18 (Late Miocene).
Last occurrence (top): within N18 zone (5.20-5.72Ma, top in Zanclean stage). Data source: Kennett & Srinivasan 1983
First occurrence (base): within N16 zone (8.58-9.83Ma, base in Tortonian stage). Data source: Kennett & Srinivasan 1983

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.72

References:

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

Keller, G. (1985). Depth stratification of planktonic foraminifers in the Miocene Ocean. In, Kennett, J. P. (ed.) The Miocene Ocean: Paleoceanography and Biogeography. GSA Memoir. 163: 1-337. gs

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


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Globigerinoides kennetti compiled by the pforams@mikrotax project team viewed: 14-11-2019

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Short stable page link: http://mikrotax.org/pforams/index.php?id=104154 Go to Archive.is to create a permanent copy of this page - citation notes



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