Globigerinatella insueta

NB TAXA WHICH ORIGINATE IN THE OLIGOCENE ARE NOT INCLUDED YET
Classification: pf_neogene -> Candeinidae -> Globigerinatella -> Globigerinatella insueta
Sister taxa: G. insueta, G. sp.,

Taxonomy

Citation: Globigerinatella insueta Cushman & Stainforth 1945
Rank: species
Basionym: Globigerinatella insueta Cushman & Stainforth 1945

Catalog entries: Globigerinatella insueta;

Type images:

Description


Test morphology: Test small , subglobular, early portion trochospiral with the final chamber usually embracing; chambers of the early portion spherical , rapidly increasing in size; the large , embracing final chamber constitutes more than 70% of the test; surface smooth, in large part covered by tiny crystallites and with extremely small microperforations; aperture in the early stage interiomarginal-umbilical , in the later chambers with secondary sutural and areal apertures, surrounded by distinct lips, with small knobby pustule-like bullae sometimes covering the areal secondary apertures or crescent-shaped sutural bullae cover the secondary sutural apertures. All bullae may have infralaminal accessory apertures. [Kennett & Srinivasan 1983]

Biogeography and Palaeobiology


Geographic distribution: Tropical [Kennett & Srinivasan 1983]

Phylogenetic relations: Gt. insueta is distinguished from its ancestor Globigerinita glutinata by its embracing final chamber and by its secondary sutural and areal supplementary apertures. [Kennett & Srinivasan 1983]

Biostratigraphic distribution

Geological Range:
Notes: The initial evolutionary appearance of Gt. insueta defines the base of Early Miocene Zone N6. Gt. insueta is a dissolution-susceptible species.
Last occurrence (top): in mid part of M6 zone (47% up, 14.7Ma, in Langhian 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).
First occurrence (base): at top of M3 zone (97% up, 17.6Ma, 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 & Srinivisan 1983, p.228

References:

Cushman, J.A. & Stainforth, R.M., (1945). The foraminifera of the Cipero Marl Formation of Trinidad, British West Indies. Cushman Laboratory for Foraminiferal Research Special Publication, 14: 1-75.

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

Wade, B.S.; Pearson, P.N.; Berggren, W.A. & Pälike, H., (2011). Review and revision of Cenozoic tropical planktonic foraminiferal biostratigraphy and calibration to the geomagnetic polarity and astronomical time scale. Earth-Science Reviews, 104: 111-142.


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Globigerinatella insueta compiled by the pforams@mikrotax project team viewed: 27-7-2017

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