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Species Globigerinoides subquadratus Brönnimann 1954


Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test subquadrate, trochospiral, chambers spherical to subspherical, three in the last whorl, increasing moderately in size as added; sutures on spiral side slightly curved, depressed, on umbilical side radial and depressed; surface distinctly perforate, with spine bases visible on the interpore ridges; primary aperture interiomarginal, umbilical with a high arch bordered by a distinct rim; two prominent supplementary apertures over sutures of earlier chambers.
Discussion / Comments:
Kennett & Srinivasan (1983):
Gs. subquadratus differs from Gs. ruber in being subquadrate and in having four chambers in the penultimate whorl instead of three to three and a half. This species evolved from Globigerina (Zeaglobigerina) brazieri in the Early Miocene warm subtropical in South Pacific by developing sutural supplementary apertures.
Srinivasan (1975):
This species differs from Globigerinoides ruber (d'orbigny) in having four chambers in the penultimate whorl instead of three to three and a half.
Chaisson & Leckie (1993):
Remarks: This is a homeomorph of Globigerinoides ruber, clearly separated from it in Hole 806B. It has a distinct rim around the primary aperture, a feature that is less robust in G. ruber.
Quilty (1976):
Remarks: In the interval N8-early N9, some small specimens of this species may be included with G. diminutus and the converse may also hold. One of the figured specimens is aberrant in having well-developed lips to the multiple apertures, thus mimicing Globigerapsis.
Systematics:

1
 Superregnum Eukaryota
  Regnum Protoctista
   Phylum Ciliophora
    Subphylum Postciliodesmatophora
     Ordo Globigerinida
      Superfamilia Globigerinaceae
       Superfamilia Nonionacea
        Familia Globigerinidae
         Genus Globigerinoides
          Species Globigerinoides subquadratus
Synonym list:
Kennett & Srinivasan (1983):
1954 Globigerinoides subquadrata Brönnimann. - Brönnimann : p.680 pl 1 figs 8 a-c
Srinivasan (1975):
1954 Globigerinoides subquadratus Brönnimann. - Brönnimann : p.680 pl. 1; fig. 5, 8a-c
1975 Globigerinoides subquadratus Brönnimann. - Srinivasan : p.145 pl. 2; fig. 8-10
Chaisson & Leckie (1993):
1954 Globigerinoides subquadratus Brönnimann. - Brönnimann : p.680 pl. 1; fig. 8a-c
1983 Globigerinoides subquadratus Brönnimann. - Kennett & Srinivasan : p.74 pl. 16; fig. 1-3
1993 Globigerinoides subquadratus Brönnimann. - Chaisson & Leckie : p.170 pl. 2; fig. 12
Quilty (1976):
1954 Globigerinoides subquadratus Brönnimann. - Brönnimann : p.680 pl. 1, fig. 5
1976 Globigerinoides subquadratus Brönnimann. - Quilty : p.677 pl. 6, figs. 6-8
Was used in synonym list of:
Globigerinoides seigliei Bermudez & Bolli 1969
Globigerinoides ruber d'Orbigny 1839
References:

Brönnimann,P. (1954):
Appendix: Descriptions of new species.
In: Probable Occurrence of Oligocene in Saipan, Am J. Sci Vol. 252(11) Eds: Todd, R.Cloud, P.E.Low, D.Schmidt, R.G. p. 680-682

Srinivasan,M.S. (1975):
Middle Miocene Planktonic Foraminifera from the Hut Bay Formation, Little Andaman Island, Bay of Bengal . Micropaleontology Vol. 21(2) p. 133-150

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.

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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