pforams@mikrotax - Globigerina umbilicata pforams@mikrotax - Globigerina umbilicata

Globigerina umbilicata


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

Taxonomy

Citation: Globigerina umbilicata Orr & Zaitzeff 1971
Taxonomic rank: species
Basionym: Globigerina umbilicata
Taxonomic discussion: Brummer & Kucera 2022 regard G. umibilcata as a morphological variant within G. bulloides and so do not include it in their list of extant species, however they do note that it may prove to be a distinct genotype

Catalog entries: Globigerina umbilicata

Type images:

Distinguishing features:
Parent taxon (Globigerina): Low trochospirally enrolled, globose test; 3-5, globular chambers in final whorl. Aperture interiomarginal, umbilical, a high arch bordered by a thin rim-like lip or thick imperforate lip. Wall spinose; spines supported by spine collars which coalesce to form ridges.
This taxon: 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]


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]

Wall type:
Spinose; Hispid [Aze 2011]

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:5-6 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 comparison with other species of the genus

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

Brummer, G-J. A. & Kucera, M. (2022). Taxonomic review of living planktonic foraminifera. Journal of Micropalaeontology. 41: 29-74. gs

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

Lam, A. & Leckie, R. M. (2020a). Late Neogene and Quaternary diversity and taxonomy of subtropical to temperate planktic foraminifera across the Kuroshio Current Extension, northwest Pacific Ocean. Micropaleontology. 66(3): 177-268. 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: 16-11-2025

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