pforams@mikrotax - Globorotalia zealandica pforams@mikrotax - Globorotalia zealandica

Globorotalia zealandica


Classification: pf_cenozoic -> Globorotaliidae -> Globorotalia -> temperate Globorotalia species -> Globorotalia zealandica
Sister taxa: G. bella, G. zealandica

Taxonomy

Citation: Globorotalia zealandica Hornibrook, 1958
taxonomic rank: species
Basionym: Globorotalia zealandica
Synonyms:
Variants:

Catalog entries: Globorotalia zealandica, Globorotalia zealandica pseudomiozea

Type images:

Distinguishing features:
Parent taxon (temperate Globorotalia species): temperate species which do not readily fit in the main lineages
This taxon: Test low trochospiral, equatorial periphery quadrilobate; chambers inflated, compressed, 4 in final whorl

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


Morphology:
Test low trochospiral, equatorial periphery quadrilobate ; chambers inflated, compressed, four in the final whorl increasing slowly in size; sutures on the spiral side depressed and slightly curved, on umbilical side depressed, slightly sinuous to radial; surface uniformly perforated with small, sub-hexagonal pore pits; umbilicus small; aperture a distinct rimmed arch , interiomarginal, umbilical-extraumbilical. [Kennett & Srinivasan 1983]

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

Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Subtriangularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Shallowwall texture:Smoothshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Weakly depressedfinal-whorl chambers:4-4 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution

Temperate to warm subtropical. [Kennett & Srinivasan 1983]. Most occurrences in the Neptune database are recorded from temperate southern latitudes.

Isotope paleobiology
Aze et al. 2011 ecogroup 3 - Open ocean thermocline. Based on comparison with other species of the genus

Phylogenetic relations
Gr. (G.) zealandica differs from its direct ancestor Gr. (G.) incognita in its larger and in the development of more inflated umbilical side and in peripheral compression. Walters (1965) was the first to describe the evolution from Gr. (G.) incognita to Gr. (G.) zealandica. The evolutionary first appearance of Gr. (G.) zealandica from Gr. (G.) incognita defines a useful datum for correlating temperate through transitional sequences (Srinivasan and Kennett, 1981b). [Kennett & Srinivasan 1983]

Most likely ancestor: Paragloborotalia incognita - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983; Lekie et al. 2018 (in discussion of P. incognita).
Likely descendants: Globorotalia praescitula; plot with descendants

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within N8 zone (15.10-16.38Ma, top in Langhian stage). Data source: Kennett & Srinivasan (1983)
First occurrence (base): in lower part of M4a subzone (35% up, 17.2Ma, in Burdigalian 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).

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.108

References:

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

Hornibrook, N. d. B. (1958). New Zealand Upper Cretaceous and Tertiary foraminiferal zones and some overseas correlations. Micropaleontology. 4: 25-38. gs

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

King, D. J., Wade, B. S. & Giles Miller, C. G. (2023). Biostratigraphic utility of coiling direction in Miocene planktonic foraminiferal genus Paragloborotalia. Newsletters on Stratigraphy. 56(3): 331-355. gs

Srinivasan, M. S. & Kennett, J. P. (1981b). Neogene planktonic foraminiferal biostratigraphy and evolution: equatorial to subantarctic, south Pacific. Marine Micropaleontology. 6: 499-533. gs

Walters, R. (1965). The Globorotalia zealandica and G. miozea lineages. New Zealand Journal of Geology and Geophysics. 8: 109-127. gs


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Globorotalia zealandica compiled by the pforams@mikrotax project team viewed: 6-10-2024

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