pforams@mikrotax - Fohsella peripheroronda

Citation: Fohsella peripheroronda (Blow & Banner, 1966)

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

Synonyms:

Globorotalia (Fohsella) peripheroronda
Globorotalia barisanensis LeRoy 1939 sensu Bolli, 1957; Jenkins, 1971 [according to Kennett & Srinivasan 1983]

Taxonomic discussion: Bolli 1957 and other early authors used the name barisanensis for this morphotype but Blow & Banner 1966 showed that the holotype of barisanensis was not rounded but rather was a typical G. fohsi - they therefore propsed the new name peripheroronda.

Distinguishing features:
Parent taxon (Fohsella): G. peripheroronda - lenguaensis - fohsi - robusta lineage
This taxon: Umbilico-convex, very low trochospiral, equatorial periphery slightly lobulate

Description

Test very low trochospiral, equatorial periphery slightly lobulate , axial periphery rounded with a tendency to become subangular, umbilical side more convex than the spiral; chambers ovate, five to six in the final whorl, increasing slowly in size as added; sutures on spiral and umbilical side strongly curved, slightly depressed; surface smooth with evenly scattered pores: umbilicus narrow; aperture interiomarginal, extraumbilical-umbilical, low arch bordered by a distinct lip. [Kennett & Srinivasan 1983]

Biogeography and Palaeobiology

Like its ancestral form Gr. kugleri, Gr. peripheroronda had a much wider geographic distribution than the middle Middle Miocene end members of this lineage. Tropical to cool subtropical. [Kennett & Srinivasan 1983] Low latitudes [Aze et al. 2011, based on Kennett & Srinivasan (1983)]

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 et al. (2001b); Coxall et al. (2007)

This species was recorded by some earlier workers (Bolli, 1957a; Jenkins, 1971) under the name Gr. barisanensis LeRoy, Blow and Banner (1966) examined the holotype of Gr. barisanensis and found it to be a fully carinate form within the praefohsi-fohsi plexus. Thus, they proposed Gr. (Turborotalia) peripheroronda for forms with rounded periphery, which had previously been included within Gr. barisanensis.
Gr. (F.) peripheroronda is distinguished from Gr. (F.) kugleri by its more compressed test, strongly recurved spiral sutures, and low-arched aperture. Olsson (1972) considered Gr. mayeri to be the ancestor of Gr. (F.) peripheroronda, whereas Jenkins (1960, 1971) and Blow (1969) suggested that Gr. (F.) peripheroronda was the ancestor of Gr. mayeri. Our studies (Srinivasan and Kennett, 1981a) of South Pacific DSDP sequences support the view of Fleisher (1974) and Stainforth et al. (1975) that Gr. (F.) kugleri was the direct ancestor of Gr. (F.) peripheroronda. [Kennett & Srinivasan 1983]

Biostratigraphic distribution

Geological Range:
Last occurrence (top): near top of M7 zone (94% up, 13.8Ma, 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).
First occurrence (base): within N4b zone (22.20-23.50Ma, base in Chattian stage). Data source: Kennett & Srinivasan 1983

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

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

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

Coxall, H. K., Wilson, P. A., Pearson, P. N. & Sexton, P. F. (2007). Iterative evolution of digitate planktonic foraminifera. Paleobiology. 33: 495-516. 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

Jenkins, D. G. (1960). Planktonic foraminifera from the Lakes Entrance oil shaft, Victoria, Australia. Micropaleontology. 6: 345-371. gs

Jenkins, D. G. (1971). New Zealand Cenozoic Planktonic Foraminifera. New Zealand Geological Survey, Paleontological Bulletin. 42: 1-278. 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

Olsson, R. K. (1972). Growth Changes in the Globorotalia fohsi Lineage. Eclogae Geologicae Helvetiae. 65(1): 165-184. gs

Pearson, P. N. et al. (2001a). Warm tropical sea surface temperatures in the Late Cretaceous and Eocene epochs. Nature. 413: 481-487. 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:	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:	5-6	N.B. These characters are used for advanced search. N/A - not applicable

Fohsella peripheroronda

Taxonomy

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

References:

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