pforams@mikrotax - Fohsella praefohsi pforams@mikrotax - Fohsella praefohsi

Fohsella praefohsi


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

Taxonomy

Citation: Fohsella praefohsi (Blow & Banner, 1966)
taxonomic rank: species
Basionym: Globorotalia (Globorotalia) praefohsi Blow & Banner, 1966
Synonyms:

Catalog entries: Globorotalia (Globorotalia) praefohsi

Type images:

Distinguishing features:
Parent taxon (Fohsella): G. peripheroronda - lenguaensis - fohsi - robusta lineage
This taxon: Like F. peripheroacuta but with a keel (imperforate carina) on the final 1 or 2 chambers

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


Morphology:
Test low trochospiral, equatorial periphery slightly lobulate, axial periphery acute with a partly developed keel on last two chambers; chambers compressed, six to seven in the final whorl, increasing slowly in size; sutures on spiral side curved, gently raised, onumbilicalsidecurved toradial,depressed; surface distinctly and uniformly perforate; umbilicus narrow, aperture umbilical-extraumbilical with a low arch bordered by a prominent lip. [Kennett & Srinivasan 1983]

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

Character matrix
test outline:Ovatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Crescenticcoiling axis:Lowperiphery:Single keelaperture 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:6-8 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 δ13C and relatively heavy δ18O. Sources cited by Aze et al. 2011 (appendix S3): Keller (1985); Hodell & Vayavananda (1993); Pearson & Shackleton (1995)

Phylogenetic relations
Gr. (F.) praefohsi differs from Gr. (F.) peripheroacuta in possessing a keel (imperforate carina) in the last one or two chambers of the final whorl. It differs from Gr. (F.) fohsi fohsi in exhibiting a keel only on the last few chambers. The early chambers of the final whorl are noncarinate. Thus Gr. (F.) praefohsi is a partly keeled form between nonkeeled intermediate Gr. (F.) peripheroacuta and the fully keeled Gr. (F.) fohsi fohsi.
Stainforth et al. (1975) considered Gr. (F.) peripheroacuta and Gr. (F.) praefohsi as intraspecific variants of Gr. (F.) fohsi fohsi, but all of these forms are useful phylogenetic species. [Kennett & Srinivasan 1983]

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

Biostratigraphic distribution

Geological Range:
Notes: The evolutionary appearance of this taxon marks the base of Zone N11 (Blow, 1969) or of zone M8 of Wade et al. (2011)
Last occurrence (top): within N12 zone (11.79-13.41Ma, top in Serravallian stage). Data source: Kennett & Srinivasan 1983
First occurrence (base): at base of M8 zone (0% up, 13.8Ma, in Serravallian stage). Data source: Wade et al. (2011), zonal marker

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.98

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

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

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

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 praefohsi compiled by the pforams@mikrotax project team viewed: 26-6-2024

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