pforams@mikrotax - Fohsella peripheroacuta

Citation: Fohsella peripheroacuta (Blow & Banner, 1966)

Basionym: Globorotalia (Turborotalia) peripheroacuta Blow & Banner, 1966

Synonyms:

Globorotalia (Fohsella) peripheroacuta

Distinguishing features:
Parent taxon (Fohsella): G. peripheroronda - lenguaensis - fohsi - robusta lineage
This taxon: Like F. peripheroronda but acutely compressed periphery in the later chambers of the final whorl.

Description

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]

Biogeography and Palaeobiology

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]

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); Pearson & Shackleton (1995)

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]

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

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

King, D. J., Wade, B. S., Liska, R. D. & Miller, C. G. (2020). A review of the importance of the Caribbean region in Oligo-Miocene low latitude planktonic foraminiferal biostratigraphy and the implications for modern biogeo- chronological schemes. Earth-Science Reviews. 202: 1-27. gs

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

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. 144: 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

test outline:	Lobate	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:	Subangular	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 peripheroacuta

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

Add Comment

Comments