Globorotalia fohsi

NB TAXA WHICH ORIGINATE IN THE OLIGOCENE ARE NOT INCLUDED YET
Classification: pf_neogene -> Globorotalidae -> Globorotalia -> fohsi lineage -> Globorotalia fohsi
Sister taxa: G. fohsi, G. lenguaensis, G. lobata, G. paralenguaensis, G. peripheroacuta, G. peripheroronda, G. praefohsi, G. robusta,

Taxonomy

Citation: Globorotalia fohsi Cushman & Ellisor, 1939
Rank: species
Basionym: Globorotalia fohsi Cushman & Ellisor, 1939
Synonyms:
  • Globorotalia (Fohsella) fohsi fohsi [e.g. Kennett & Srinivasan 1983]

Catalog entries: Globorotalia fohsi;

Type images:

Description


Diagnostic characters: Biconvex, low trochospiral, equatorial periphery lobulate with distinct keel

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, axial periphery acute with a distinct keel throughout; umbil- ical side slightly more convex than spiral; chambers compressed, six to eight in the final whorl, increasing uniformly in size; sutures on spiral side curved and slightly raised , on umbilical side slightly curved to radial, depressed; surface smooth , uniformly perforate; umbilicus narrow; aperture interiomarginal, extraumbilical-umbilical, with a low arch, bordered by a lip. [Kennett & Srinivasan 1983]

Biogeography and Palaeobiology


Geographic distribution: Tropical to warm subtropical. [Kennett & Srinivasan 1983]

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: Gr. (F.) fohsi fohsi differs from its ancestor, Gr. (F.) praefohsi, in exhibiting a distinct keel throughout the entire final whorl, and from the more advanced forms, Gr. (F.) fohsi lobata and Gr. (F.) fohsi robusta, in its smaller size and usual lack of limbate sutures. This species grades into Gr. (F.) fohsi lobata by undergoing a rapid increase in size of successive chambers in radial length and a tendency to develop a cockscomb-shaped peripheral margin. [Kennett & Srinivasan 1983]

Biostratigraphic distribution

Geological Range:
Notes: The evolutionary first appearance of Gr. (F.) fohsi fohsi marks the base of Zone N12, or of Zone M9 of Wade et al. (2011)
Last occurrence (top): at top of M9 zone (100% up, 11.8Ma, in Serravallian stage). Data source: Wade et al. (2011), zonal marker
First occurrence (base): at base of M9 zone (0% up, 13.4Ma, in Serravallian stage). Data source: Wade et al. (2011), zonal marker

Plot of occurrence data:

Primary source for this page: Kennett & Srinivisan 1983, p.100

References:

Aze, T.; Ezard, T.H.G.; Purvis, A.; Coxall, H.K.; Stewart, D.R.M.; Wade, B.S. & Pearson, P.N.P., (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews, 86: 900-927.

Cushman, J.A. & Ellisor, A.C., (1939). New species of foraminifera from the Oligocene and Miocene. Contributions From the Cushman Foundation for Foraminiferal Reseach, 15: 1-14.

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.

Keller, G., (1985). Depth stratification of planktonic foraminifers in the Miocene Ocean. In: Kennett, J.P. (Editor), The Miocene Ocean: Paleoceanography and Biogeography. GSA Memoir The Geological Society of America, Boulder, Colorado, pp. 1-337.

Kennett, J.P. & Srinivasan, M.S., (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania, 1-265 pp.

Pearson, P.N. & Shackleton, N.J. (Editors), (1995). Neogene multispecies planktonic foraminifer stable isotope record, Site 871, Limalok Guyot. Proceedings of the Ocean Drilling Program, Scientific Results, 144. Ocean Drilling Program, College Station, TX, 401-410 pp.

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.


Globorotalia fohsi compiled by the pforams@mikrotax project team viewed: 29-5-2017

Taxon Search:
Advanced Search




Comments (0)

No comments yet. Be the first!

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics