Fohsella paralenguaensis


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

Taxonomy

Citation: Fohsella paralenguaensis (Blow, 1969)
Rank: species
Basionym: Globorotalia (Globorotalia) paralenguaensis Blow, 1969

Catalog entries: Globorotalia (Globorotalia) paralenguaensis

Type images:

Distinguishing features: Like G. lenguaensis but less circular and test less tightly coiled

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 profile ovate

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


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

Test morphology: Test low trochospiral, the spire opens slowly, later more rapidly; equatorial profile ovate, very slightly lobulate; axial pro- file unequally biconvex, with more vaulted ventral side; peripheral margin with a dis- tinct imperforate carina, chambers 6 to 8 in the final whorl, less tightly coiled; spiral sutures on early chambers strongly curved, later more nearly radial, depressed; on umbilical side almost radial, depressed; surface smooth, densely perforate; umbilicus closed; aperture interiomarginal, umbilical-extraumbilical, a low arch bordered by a lip. [Kennett & Srinivasan 1983]

Character matrix

test outline:Ovatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Crescenticcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Subtriangularumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Shallowwall texture:Smoothshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Weakly depressedfinal-whorl chambers:6.0-8.0 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.) paralenguaensis is intermediate between Gr. (Gr.) lenguaensis Bolli and Gr. (Gr.) merotumida Blow and Banner. The former has a more circular equatorial profile and a tightly coiled test; the latter differs in possessing a distinct keel. [Kennett & Srinivasan 1983]

Most likely ancestor: Fohsella lenguaensis - at confidence level 4 (out of 5). Data source: Kennett & Srinivasan 1983, fig. 17.

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within N16 zone (8.58-9.83Ma, top in Tortonian stage). Data source: Chaisson & Pearson (1997)
First occurrence (base): within N15 zone (9.83-10.46Ma, base in Tortonian stage). Data source: Chaisson & Pearson (1997)

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.154

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. (1969). Late middle Eocene to Recent planktonic foraminiferal biostratigraphy. In, Bronnimann, P. & Renz, H. H. (eds) Proceedings of the First International Conference on Planktonic Microfossils, Geneva, 1967. E J Brill, Leiden 380-381. 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


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Fohsella paralenguaensis compiled by the pforams@mikrotax project team viewed: 16-12-2019

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