Fohsella lenguaensis


Classification: pf_cenozoic -> Globorotaliidae -> Fohsella -> Fohsella lenguaensis
Sister taxa: F. paralenguaensis, F. lenguaensis, F. robusta, F. lobata, F. fohsi, F. praefohsi, F. peripheroacuta, F. peripheroronda,

Taxonomy

Citation: Fohsella 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:

Distinguishing features: Small with circular equatorial profile, and smooth, densely perforate, test

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: 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]

Character matrix

test outline:Circularchamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Crescenticcoiling axis:Lowperiphery:N/Aaperture border:Thick lip
umb chbr shape:Subtriangularumbilicus:Narrowperiph margin shape:Moderately roundedaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Shallowwall texture:Smoothshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Weakly depressedfinal-whorl chambers:6.0-7.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


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

[SCOR WG138]


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]

Most likely ancestor: Fohsella peripheroacuta - at confidence level 3 (out of 5). Data source: Aze et al. 2011.
Likely descendants: Fohsella paralenguaensis;

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 & Srinivasan 1983, p.152

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

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


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Fohsella lenguaensis compiled by the pforams@mikrotax project team viewed: 13-12-2019

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