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Globigerinoides sicana/bisphericus from: Chaisson, W.P.Leckie, R.M. (1993): High-Resolution Planktonic Foraminifer Biostratigraphy of Site 806, Ontong Java Plateau (Western Equatorial Pacific). In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 130 Eds: Berger, W.H.Kroenke, L.W..Mayer, L.A..et al. p. 137-178
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Anonymous: Unedited TaxonConcept data
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Species Globigerinoides sicana/bisphericus


Discussion / Comments:
Chaisson & Leckie (1993):
Remarks: This taxon represents a transitional form between Globigerinoides triloba and Praeorbulina sicana. We have applied the species concepts of these taxa somewhat differently than Jenkins et al. (1981) because of the relatively poor preservation and few specimens recovered in each sample. Similar species: G. sicana/bisphericus differs from G. triloba in having a larger, more embracing final chamber, and it differs from P. sicana in having only two low apertures visible along the base of the final chamber.
Synonym list:
Chaisson & Leckie (1993):
1954 Globigerinoides bisphericus Todd. - Todd et al. : p.681 pl. 1; fig. 1a-c and 4
References:

Todd,R.; Cloud,P.E.; Low,D. and Schmidt,R.G. (1954):
Probable occurrence of Oligocene on Saipan . Amer. Journ. Sci. Vol. 252 p. 673-682

Chaisson,W.P. and Leckie,R.M. (1993):
High-Resolution Planktonic Foraminifer Biostratigraphy of Site 806, Ontong Java Plateau (Western Equatorial Pacific).
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 130 Eds: Berger, W.H.Kroenke, L.W..Mayer, L.A..et al. p. 137-178
Anonymous: Unedited TaxonConcept data
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