pforams@mikrotax - Fohsella lenguaensis

Citation: Fohsella lenguaensis (Bolli, 1957)

Basionym: Globorotalia lenguaensis

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

Distinguishing features:
Parent taxon (Fohsella): G. peripheroronda - lenguaensis - fohsi - robusta lineage
This taxon: Small with circular equatorial profile, and smooth, densely perforate, test

Description

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

Tropical to warm subtropical. [Kennett & Srinivasan 1983] Low latitudes [Aze et al. 2011, based on Kennett & Srinivasan (1983)]

[SCOR WG138]

Aze et al. 2011 ecogroup 3 - Open ocean thermocline. Based on light δ¹³C and relatively heavy δ¹⁸O. Sources cited by Aze et al. 2011 (appendix S3): Keller (1985); Hodell & Vayavananda (1993)

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).

References:

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

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. gs

Bolli, H. M. (1957b). Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, B.W.I. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli & E. Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin . 215: 97-123. gs

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. gs

Keller, G. (1985). Depth stratification of planktonic foraminifers in the Miocene Ocean. In, Kennett, J. P. (ed.) The Miocene Ocean: Paleoceanography and Biogeography. GSA Memoir . 163: 1-337. gs

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

Lam, A. & Leckie, R. M. (2020a). Late Neogene and Quaternary diversity and taxonomy of subtropical to temperate planktic foraminifera across the Kuroshio Current Extension, northwest Pacific Ocean. Micropaleontology. 66(3): 177-268. gs

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

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

test outline:	Circular	chamber arrangement:	Trochospiral	edge view:	Inequally biconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Crescentic	coiling axis:	Low	periphery:	N/A	aperture border:	Thick lip
umb chbr shape:	Subtriangular	umbilicus:	Narrow	periph margin shape:	Moderately rounded	accessory apertures:	None
spiral sutures:	Weakly depressed	umb depth:	Shallow	wall texture:	Smooth	shell porosity:	Macroperforate: >2.5µm
umbilical or test sutures:	Weakly depressed	final-whorl chambers:	6-7	N.B. These characters are used for advanced search. N/A - not applicable

Fohsella lenguaensis

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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