Fohsella peripheroacuta


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

Taxonomy

Citation: Fohsella peripheroacuta (Blow & Banner, 1966)
Rank: species
Basionym: Globorotalia (Turborotalia) peripheroacuta Blow & Banner, 1966
Synonyms:

Catalog entries: Globorotalia (Turborotalia) peripheroacuta

Type images:

Distinguishing features: Like G. peripheroronda but acutely compressed periphery in the later chambers of the final whorl.

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 slightly lobulate

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


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

Test morphology: Test low trochospiral, equatorial periphery slightly lobulate. In axial profile, the periphery of the earlier chambers of the last whorl is broadly rounded but becomes progressively more compressed as the final chamberisapproached,sothatthelastthree chambers in the final whorl have acute peripheral margin; chambers compressed, six to seven in the final whorl, increasing slowly in size; sutures on spiral side strongly recurved, gently depressed; on umbilical side strongly curved to radial; surface uniformly perforate; umbilicus narrow, aperture interiomarginal, extraumbilical-umbilical, a low arch bordered by a prominent lip. [Kennett & Srinivasan 1983]

Character matrix

test outline:Lobatechamber 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:Subangularaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Shallowwall texture:Smoothshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Weakly depressedfinal-whorl chambers:6.0-7.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Tropical to cool subtropical. This species had a much wider geographic distribution than its descendants. [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); Pearson & Shackleton (1995)

Phylogenetic relations: This species mainly differs from its ancestor Gr. (F.) peripheroronda by having an acutely compressed periphery in the later chambers of the final whorl. [Kennett & Srinivasan 1983]

Most likely ancestor: Fohsella peripheroronda - at confidence level 4 (out of 5). Data source: Kennett & Srinivasan 1983, fig. 12.
Likely descendants: Fohsella lenguaensis; Fohsella praefohsi;

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within N11 zone (13.41-13.77Ma, top in Serravallian stage). Data source: Kennett & Srinivasan 1983
First occurrence (base): at base of M7 zone (0% up, 14.2Ma, in Langhian stage). Data source: Wade et al. (2011), zonal marker

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.96

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. & Banner, F. T. (1966). The morphology, taxonomy and biostratigraphy of Globorotalia barisanensis LeRoy, Globorotalia fohsi Cushman and Ellisor, and related taxa. Micropaleontology. 12(3): 286-302. 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

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

Pearson, P. N. & Shackleton, N. J. (1995). Neogene multispecies planktonic foraminifer stable isotope record, Site 871, Limalok Guyot. Proceedings of the Ocean Drilling Program, Scientific Results. 401-410. 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 peripheroacuta compiled by the pforams@mikrotax project team viewed: 16-11-2019

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