Globorotalia lenguaensis

NB TAXA WHICH ORIGINATE IN THE OLIGOCENE ARE NOT INCLUDED YET
Classification: pf_neogene -> Globorotalidae -> Globorotalia -> fohsi lineage -> Globorotalia lenguaensis
Sister taxa: G. fohsi, G. lenguaensis, G. lobata, G. paralenguaensis, G. peripheroacuta, G. peripheroronda, G. praefohsi, G. robusta,

Taxonomy

Citation: Globorotalia lenguaensis (Bolli, 1957)
Rank: species
Basionym: Globorotalia lenguaensis
Synonyms: Globorotalia (Globorotalia) lenguaensis (Bolli, 1957) [e.g. Kennett & Srinivasan 1983]

Catalog entries: Globorotalia lenguaensis;

Type images:

Description


Diagnostic characters: Biconvex, low trochospiral, equatorial periphery almost circular but slightly lobulate

Aperture: : Interiomarginal umbilical-extraumbilical low slit with prominent wide lip [Aze 2011, based on Kennett & Srinivasan 1983]


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

Test morphology: Test small, low trochospiral,equally biconvex, equatorial periphery almost circular, slightly lobulate , axial periphery subangular to angular; chambers strongly compressed, 6 to 7 in the final whorl, increasing moderately in size as added; sutures on spiral side strongly curved , depressed; on umbilical side sinuously radial, depressed; surface smooth, densely perforate, imperforate on the peripheral margin; umbilicus almost closed, aperture interiomarginal , extraumbilical-umbilical, a low slit bordered by a pronounced, wide lip. [Kennett & Srinivasan 1983]

Biogeography and Palaeobiology


Geographic distribution: Tropical to warm subtropical. [Kennett & Srinivasan 1983]

Isotope paleobiology: Aze et al. 2011 ecogroup 3 - Open ocean thermocline. Based on light ∂13C and relatively heavy ∂18O. Sources cited by Aze et al. 2011 (appendix S3): Keller (1985); Hodell & Vayavananda (1993)

Phylogenetic relations: Gr. (Gr.) lenguaensis is distinguished by its small size, circular equatorial profile, and the smooth and densely perforate test. Blow (1959) considered Gr. minima Akers as the ancestor of Gr. (Gr.) lenguaensis. In contrast, our observations suggest that Gr. (Gr.) lenguaensis was derived from early members of Fohsella. [Kennett & Srinivasan 1983]

Biostratigraphic distribution

Geological Range:
Last occurrence (top): at top of M13 zone (100% up, 6.1Ma, in Messinian stage). Data source: Wade et al. (2011), zonal marker
First occurrence (base): near base of M9b subzone (14% up, 12.9Ma, in Serravallian 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.152

References:

Aze, T.; Ezard, T.H.G.; Purvis, A.; Coxall, H.K.; Stewart, D.R.M.; Wade, B.S. & Pearson, P.N.P., (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews, 86: 900-927.

Blow, W.H., (1959). Age, correlation, and biostratigraphy of the upper Tocuyo (San Lorenzo) and Pozon Formations, eastern Falcon, Venezuela. Bulletins of American Paleontology, 39(178): 67-251.

Bolli, H.M., (1957). Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, B.W.I. In: Loeblich, A.R., Jr. et al. (Editors), Studies in Foraminifera: U.S. National Museum Bulletin 215. U.S. Government Printing Office, Washington, DC, pp. 97-123.

Hodell, D.A. & Vayavananda, A., (1993). Middle Miocene paleoceanography of the western equatorial Pacific (DSDP Site 289) and the evolution of Globorotalia (Fohsella). Marine Micropaleontology, 22: 279-310.

Keller, G., (1985). Depth stratification of planktonic foraminifers in the Miocene Ocean. In: Kennett, J.P. (Editor), The Miocene Ocean: Paleoceanography and Biogeography. GSA Memoir The Geological Society of America, Boulder, Colorado, pp. 1-337.

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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Globorotalia lenguaensis compiled by the pforams@mikrotax project team viewed: 23-7-2017

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