Globigerinoides tyrrhenicus Borsetti and Cati [according to Berggren 1977; Kennett & Srinivasan 1983]
Catalog entries: Globigerinoides rubra seigliei, Globigerinoides tyrrhenicus
Type images:Distinguishing features: Like G. ruber but somewhat aberrant primary aperture and large supplementary apertures
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.Aperture: Primary aperture interiomarginal umbilical wide arch with rim. Supplementary sutural apertures on spiral side [Aze 2011, based on Kennett & Srinivasan 1983]
Diagnostic characters: Large, medium to high trochospiral, subquadrate outline
Wall type: Spinose; Cancellate [Aze 2011]
Test morphology: Test large subquadrate, medium to high trochospiral, three subspherical to ovate chambers in the final whorl; sutures radial, depressed; surface coarsely perforate; primary aperture interiomarginal, umbilical, a wide-open asymmetrical arch; supplementary apertures large, high arch situated over sutures of earlier chambers. [Kennett & Srinivasan 1983]
Character matrix
test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Equally biconvex | aperture: | Umbilical |
sp chamber shape: | Globular | coiling axis: | Moderate-high | periphery: | N/A | aperture border: | Thin lip |
umb chbr shape: | Globular | umbilicus: | Wide | periph margin shape: | Broadly rounded | accessory apertures: | Sutural |
spiral sutures: | Strongly depressed | umb depth: | Deep | wall texture: | Cancellate | shell porosity: | Macroperforate: >2.5µm |
umbilical or test sutures: | Strongly depressed | final-whorl chambers: | 3.0-3.0 | N.B. These characters are used for advanced search. N/A - not applicable |
[SCOR WG138]
Geographic distribution: Warm to cool subtropical. [Kennett & Srinivasan 1983] Low latitudes [Aze et al. 2011, based on Kennett & Srinivasan (1983)]
Isotope paleobiology: Aze et al. 2011 ecogroup 1 - Open ocean mixed-layer tropical/subtropical, with symbionts. Based on very heavy ∂13C and relatively light ∂18O. Sources cited by Aze et al. 2011 (appendix S3): Keller (1985)
Phylogenetic relations: The morphology of Gs. siegliei closely resembles Gs. ruber from which it seems to have been derived during the Late Miocene by developing somewhat aberrant primary and supplementary apertures. [Kennett & Srinivasan 1983]
Most likely ancestor: Globigerinoides ruber - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983, fig. 10.
Geological Range:
Last occurrence (top): within N18 zone (5.20-5.72Ma, top in Zanclean stage). Data source: Kennett & Srinivasan 1983
First occurrence (base): within N16 zone (8.58-9.83Ma, base in Tortonian stage). Data source: Kennett & Srinivasan 1983
Plot of occurrence data:
Primary source for this page: Kennett & Srinivasan 1983, p.78
Aze, T. et al. (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews. 86: 900-927. gs Berggren, W. A. (1977b). Late Neogene foraminiferal biostratigraphy of the Rio Grande Rise (South Atlantic). Marine Micropaleontology. 2(3): 265-313. gs Bermudez, P. J. & Bolli, H. M. (1969). Consideraciones sobre los sedimentos del mioceno medio al reciente de las costas central y oriental de Venezuela. Tercera Parte. Los foraminiferos planctonicos. Boletin de Geologia. 10(20): 137-223. 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 Norris, R. D. (1998). Planktonic foraminifer biostratigraphy: Eastern Equatorial Atlantic. Proceedings of the Ocean Drilling Program, Scientific Results. 159: 445-479. gsReferences:
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Globigerinoides seigliei compiled by the pforams@mikrotax project team viewed: 12-12-2019
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