Globigerinatella insueta

Classification: pf_cenozoic -> Globigerinitidae -> Globigerinatella -> Globigerinatella insueta
Sister taxa: G. insueta, G. sp.,


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

Catalog entries: Globigerinatella insueta

Type images:

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.


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]

Character matrix

test outline:Circularchamber arrangement:Envelopingedge view:Equally biconvexaperture:Multiple
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Bulla
umb chbr shape:Globularumbilicus:Absentperiph margin shape:Broadly roundedaccessory apertures:Areal
spiral sutures:Weakly depressedumb depth:N/Awall texture:Smoothshell porosity:Microperforate: <1µm
umbilical or test sutures:Weakly depressedfinal-whorl chambers:1.0-1.0 N.B. These characters are used for advanced search. N/A - not applicable

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]

Most likely ancestor: Globigerinita glutinata - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983, fig 25.

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 & Srinivasan 1983, p.228


Brönnimann, P. (1950a). Occurrence and ontogeny of Globigerinatella insueta Cushman and Stainforth from the Oligocene of Trinidad, B. W. I. Contributions from the Cushman Foundation for Foraminiferal Research. 1(3&4): 80-82. gs :: ::

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. gs :: ::

Fox, L. R. & Wade, B. S. (2013). Systematic taxonomy of early–middle Miocene planktonic foraminifera from the equatorial Pacific Ocean: Integrated Ocean Drilling Program, Site U1338. Journal of Foraminiferal Research. 43: 374-405. gs :: ::

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

Norris, R. D. (1998). Planktonic foraminifer biostratigraphy: Eastern Equatorial Atlantic. Proceedings of the Ocean Drilling Program, Scientific Results. 159: 445-479. gs :: ::

Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. gs :: ::

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. gs :: ::


Globigerinatella insueta compiled by the pforams@mikrotax project team viewed: 8-7-2020

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