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Species Globigerinoides diminutus Bolli 1957


Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test small, trochospiral, equatorial periphery subquadrate, chambers spherical in early stages, later becoming laterally compressed; three chambers in the final whorl, increasing moderately in size; sutures on both spiral and umbilical side radial and depressed; surface distinctly cancellate; umbilicus small, primary aperture interiomarginal, umbilical small, almost circular symmetrically above the suture line of the two earlier chambers; supplementary sutural apertures, generally two situated over the sutures of earlier chambers.
Discussion / Comments:
Kennett & Srinivasan (1983):
The position of the apertures symmetrically above the sutures between two earlier chambers, the subquadrate shape of the test, and the cancellate surface in both the Gs. diminutus and Gs. subquadratus suggest a close phylogenetic relationship between these two forms. Gs. diminutus is distinguished from Gs. subquadratus by its very small size and more compact test. Possibly Gs. diminutus represents a tropical variant of Gs. subquadratus.
Bolli & Saunders (1985):
The species is morphologically similar to G. ruber but differs in its much smaller and more compact test. Chamber arrangement and position of the apertures symmetrically above the suture between earlier chambers are the same. Compared with G. ruber the aperture in G. diminutus is always small, higher and narrower, sometimes appearing almost as a vertical slit.
Chaisson & Leckie (1993):
Similar species: Globigerinoides bollii is larger and less spherical. Its primary aperture is over a chamber, whereas that of G. diminutus is over a suture. G. diminutus is also smaller than G. subquadratus, and it has a distinctly more compact test.
Quilty (1976):
Remarks: The few specimens recovered are very poorly preserved and the identification is a little tentative.
Systematics:

1
 Superregnum Eukaryota
  Regnum Protoctista
   Phylum Ciliophora
    Subphylum Postciliodesmatophora
     Ordo Globigerinida
      Superfamilia Globigerinaceae
       Superfamilia Nonionacea
        Familia Globigerinidae
         Genus Globigerinoides
          Species Globigerinoides diminutus
Synonym list:
Kennett & Srinivasan (1983):
1957 Globigerinoides diminuta Bolli. - Bolli : p.114 figs 11 a-c
Bolli & Saunders (1985):
1957 Globigerinoides diminutus Bolli. - Bolli : p.114 pl. 25, figs. 11a-c
1985 Globigerinoides diminutus Bolli. - Bolli & Saunders : p.114 pl. 25, figs. 11a-c
Vincent & Toumarkine (1990):
1957 Globigerinoides diminuta Bolli. - Bolli : p. 114 pl. 25, fig.11
1990 Globigerinoides diminutus Bolli. - Vincent & Toumarkine : p. 830 pl. 1, figs. 23-25
Chaisson & Leckie (1993):
1957 Globigerinoides diminutus Bolli. - Bolli : p.114 pl. 25; fig. 11a-c
1983 Globigerinoides diminutus Bolli. - Kennett & Srinivasan : p.74 pl. 16; fig. 4-6
1993 Globigerinoides diminutus Bolli. - Chaisson & Leckie : p.170 pl. 2; fig. 7
Quilty (1976):
1957 Globigerinoides diminutus Bolli. - Bolli : p.114 pl. 25, fig. 11a-c
Stratigraphy - absolute ages:
FAD: 16.1 ± 0 [Ma], Berggren et al. (1995)
References:

Bolli,H.M. (1957):
Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, B.W.I..
In: Studies in Foraminifery, Bulletin of the U.S. National Museum Vol. 215 Eds: Loeblich, A.R.Tappan, H.Beckmann, J.P.Bolli, H.M.Gallitelli, E.M.Troelsen, J.C. p. 97-123

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.

Bolli,H.M. and Saunders,J.B. (1985):
Oligocene to Holocene low latitude planktic foraminifers.
In: Plankton Stratigraphy Eds: Bolli, H.M.Saunders, J.B. p. 155-262

Vincent,E. and Toumarkine,M. (1990):
Neogene planktonic foraminifers from the Western Tropical Indian Ocean, Leg 115.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 115 Eds: Duncan, R.A..Backman, J.Peterson, L.C. p. 795-836

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

Berggren,W.A.; Kent,D.V.; Swisher,C.C. and Aubry,M.P. (1995):
A revised Cenozoic Geochronology and Chronostratigraphy.
In: Geochronology Time Scales and Global Stratigraphic Correlation, SEPM Special Publication Vol. 54
Anonymous: Unedited TaxonConcept data
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