Fohsella lobata


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

Taxonomy

Citation: Fohsella lobata (Bermudez 1949)
Rank: species
Basionym: Globorotalia lobata
Synonyms:

Catalog entries: Globorotalia lobata, Globorotalia dominicana,

Type images:

Distinguishing features: Like G. fohsi but larger and with characteristic cockscomb-shaped peripheral margin

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, last few chambers distinctly lobulate with keel

Aperture: : Interiomarginal umbilical-extraumbilical slit with small flange-like lip [Aze 2011, based on Kennett & Srinivasan 1983]


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

Test morphology: Test low trochospiral, biconvex, equatorial periphery of the last few chambers distinctly lobulate; six to eight chambers of the final whorl, increasing rapidly in size, especially in their radial length, giving rise to a characteristic cockscomb outline; sutures on spiral side recurved, limbate coalescing into the peripheral keel, on umbilical side slightly curved to radial ; surface smooth, distinctly and uniformly perforate; umbilicus narrow; aperture interio-marginal, extraumbilical-umbilical, a slit with a small flangelike lip. [Kennett & Srinivasan 1983]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Crescenticcoiling axis:Lowperiphery:Single keelaperture border:Thin lip
umb chbr shape:Subtriangularumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:None
spiral sutures:Raisedumb depth:Shallowwall texture:Smoothshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Weakly depressedfinal-whorl chambers:6.0-8.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Restricted to equatorial areas. [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 is distinguished from Gr. (F.) fohsi fohsi by its larger test size and typical cockscomb-shaped peripheral margin, a change that marks the base of Globorotalia fohsi lobata Zone of Bolli (1957).
Blow and Banner (1966) and Blow (1969) suggested that Gr. (F.) fohsi lobata and Gr. (F.) fohsi robusta may be phenotypic variants of a single form, but we consider them to be valid phylogenetic species. [Kennett & Srinivasan 1983]

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

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within M9b subzone (11.79-13.13Ma, top in Serravallian stage). Data source: Kennett & Srinivasan 1983
First occurrence (base): within M9a subzone (13.13-13.41Ma, base in Serravallian stage). Data source: Wade et al. (2011), additional event; position within zone not given in table 1 of Wade et al. (2011).

Plot of occurrence data:

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

References:

Aze, T. et al. (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews. 86: 900-927. gs

Bermudez, P. J. (1949). Tertiary smaller foraminifera of the Dominican Republic. Cushman Laboratory for Foraminiferal Research, Special Publication. 25: 1-322. 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

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

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

Thalmann, H. E. (1950). New names and homonyms in Foraminifera. Contributions from the Cushman Foundation for Foraminiferal Research. 1(03-Apr): 41-45. 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 lobata compiled by the pforams@mikrotax project team viewed: 24-7-2019

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Comments (1)

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François

Hi

Citation: Brackets are missing. Other synonym: Globorotalia dominicana Bermúdez, 1950 please see: http://www.marinespecies.org/foraminifera/aphia.php?p=taxdetails&id=901528

Best,

François

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Jeremy Young (Tonbridge, UK)

Good point - i need to change a few of these now that we are using Fohsella

thanks Jeremy

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