Globorotalia zealandica


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

Taxonomy

Citation: Globorotalia zealandica Hornibrook, 1958
Rank: species
Basionym: Globorotalia zealandica
Synonyms:
Variants:

Catalog entries: Globorotalia zealandica, Globorotalia zealandica pseudomiozea

Type images:

Distinguishing features: 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


Diagnostic characters: Low trochospiral, equatorial periphery quadrilobate, compressed

Aperture: Interiomarginal umbilical-extraumbilical distinct rimmed arch [Aze 2011, based on Kennett & Srinivasan 1983]


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

Test 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]

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:4.0-4.0 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;

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

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


logo

Globorotalia zealandica compiled by the pforams@mikrotax project team viewed: 12-11-2019

Taxon Search:
Advanced Search

Short stable page link: http://mikrotax.org/pforams/index.php?id=104140 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet. Be the first!

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics