Globigerina umbilicata


Classification: pf_cenozoic -> Globigerinidae -> Globigerina -> Globigerina umbilicata
Sister taxa: G. bulloides, G. falconensis, G. umbilicata, G. archaeobulloides, G. officinalis, G. sp.,

Taxonomy

Citation: Globigerina umbilicata Orr & Zaitzeff 1971
Rank: species
Basionym: Globigerina umbilicata

Catalog entries: Globigerina umbilicata

Type images:

Distinguishing features: 5-6 chambers in final whorl; often with kummerform final chamber. Umbilicus very large, deep. Aperture large, umbilical, with thin lip.

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 trochospiral, chambers spherical to subspherical

Aperture: Umbilical large opening with a thin lip [Aze 2011, based on Kennett & Srinivasan 1983]


Wall type: Spinose; Hispid [Aze 2011]

Test morphology: Test medium to large, low trochospiral; chambers spherical to subspherical, increasing slowly in size as added, five to six in the final whorl; sutures distinctly depressed, often with a reduced final chamber (kummerform). Surface similar to G.  bulloides. Umbilicus very large, deep. Aperture large, umbilical, with a thin lip. [Kennett & Srinivasan 1983]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Low-moderateperiphery:N/Aaperture border:Thin lip
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Deepwall texture:Cancellateshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:5.0-6.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


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

[SCOR WG138]


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): this study

Most likely ancestor: Globigerina bulloides - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983, fig. 8.

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within N22 zone (0.00-1.93Ma, top in "Holocene" stage). Data source: Kennett & Srinivasan 1983 - LAD not well established but not an extant species.
First occurrence (base): within N21 zone (1.93-3.10Ma, base in Piacenzian stage). Data source: Kennett & Srinivasan 1983

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.38

References:

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

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

Orr, W. N. & Zaitzeff, J. B. (1971). A new planktonic foraminiferal species from the California Pliocene. Journal of Foraminiferal Research. 1(1): 17-19. gs


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Globigerina umbilicata compiled by the pforams@mikrotax project team viewed: 17-10-2019

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Short stable page link: http://mikrotax.org/pforams/index.php?id=104038 Go to Archive.is to create a permanent copy of this page - citation notes



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