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Species Globigerinoides sicanus De Stefani 1950


Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test spherical to subspherical, two and one-half to three chambers in the final whorl. In general, test consists of two equal or nearly equal spheres, one consisting of final chamber, the other consisting of the penultimate chamber strongly embracing the earlier ones, sutures distinct and depressed. Surface distinctly cancellate; aperture two to three irregular, narrow, elongate slits at the base of the final chamber.
Discussion / Comments:
Kennett & Srinivasan (1983):
This species has been widely recorded as Globigerinoides bisphericusTodd, overlooking the priority of De Stefani's name. Bronnimann and Resig (1971) proposed several new taxa (Globigerinoides pseudoselli, Globigerinoides sicanus praesicanus) for this group of subspherical forms, which are here regarded as variants within Gs. triloba—Gs. sicanus populations. Gs. sicanus developed from Gs. triloba (Reuss) and is the direct ancestor of Praeorbulina and, in turn, Orbulina .
Quilty (1976):
Remarks: The specimens reworked into the late Miocene of Hole 319 include those forms described by Brönnimann and Resig (1969) as G. sicanus praesicanus, and also possibly G. pseudosellii..
Synonym list:
Kennett & Srinivasan (1983):
1950 Globigerinoides sicanus De Stefani. - de Stefani : p.9 fig 6
Quilty (1976):
1950 Globigerinoides sicanus De Stefani. - de Stefani : p.9 (figures, Cushman and Stainforth, 1945, pi. 13, fig. 6)
1976 Globigerinoides sicanus De Stefani. - Quilty : p.677 pl. 6, figs. 3-5
Was used in synonym list of:
Praeorbulina sicana De Stefani 1950
References:

de Stefani,T. (1950):
Su alcune manifestazoni di idrocarburi in provincia di Palermo e descrizione di Foraminifera nuovi . Plinia, Palermo, Italy Vol. 3

Quilty,P.G.. (1976):
Planctonic foraminifera DSDP Leg 34- Nazca Plata . DSDP initial reports Vol. 34

Kennett,J. and Srinivasan,M.S. (1983):
Neogene Planktonic Foraminifera - A Phylogenetic Atlas.

Anonymous: Unedited TaxonConcept data
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