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Species Globigerinoides obliquus Bolli 1957


Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test trochospiral, chambers spherical except the final one, which is compressed in a lateral oblique manner, three to four in the final whorl increasing rapidly in size as added, sutures on spiral side radial to obliquely depressed, on umbilical side radial and depressed, surface distinctly pitted and perforate; primary aperture a distinct, high, and wide arch, interiomarginal, umbilical; secondary sutural aperture on last few chambers opposite the primary aperture.
Discussion / Comments:
Kennett & Srinivasan (1983):
Gs. obliquus is distinguished by its obliquely oppressed later chamber. It evolved from Gs. altiapertura in Zone N5 (Early Miocene) by development of the last few chambers that are compressed in a lateral and oblique manner.
Chaisson & Pearson (1997):
The morphology of this species is quite variable. It can be large with inflated chambers and a large aperture (Sample 154-925B-29H-5, 65-67 cm) or smaller with compressed chambers that give the test a quadrate appearance (Sample 154-925B-26H-5, 65-67 cm). The abundance of this species gradually declines through the Pliocene as the abundance of Globigerinoides ruber increases until the abundance of these two species become roughly equal at Sample 154-925B-12H-5, 65-67 cm. After this point Gs. obliquus becomes quite small and rare.
Chaisson & Leckie (1993):
Remarks: A broad interpretation of this species concept is employed. Similar species: Globigerinoides obliquus is gradational with G. extremus, but it can be distinquished by its more inflated final chamber. Early forms of G. obliquus differ primarily from G. altiapertura and G. parawoodi in the shape of the primary aperture, G. obliquus being characterized by an asymmetric aperture (i.e., wider than high). See Globigerinoides altiapertura.
Systematics:

1
 Superregnum Eukaryota
  Regnum Protoctista
   Phylum Ciliophora
    Subphylum Postciliodesmatophora
     Ordo Globigerinida
      Superfamilia Globigerinaceae
       Superfamilia Nonionacea
        Familia Globigerinidae
         Genus Globigerinoides
          Species Globigerinoides obliquus
Synonym list:
Kennett & Srinivasan (1983):
1957 Globigerina obliqua Bolli. - Bolli : p.113 pl 25 figs 10 a-c
Chaisson & d'Hondt (2000):
1957 Globigerina obliqua Bolli. - Bolli : p.113 pl 25 figs 10 a-c
1983 Globigerinoides obliquus Bolli. - Kennett & Srinivasan : p.56 pl 11 figs 7-9
Chaisson & Pearson (1997):
1957 Globigerinoides obliqua Bolli. - Bolli : p. 113 pl. 25, figs. 10a-c
1983 Globigerinoides obliquus Bolli. - Kennett & Srinivasan : p. 65 pl. 11, figs. 7-9
Srinivasan (1975):
1957 Globigerinoides obliqua Bolli. - Bolli : p.113 pl. 25; fig. 9-10; text-fig. 5a-b
1975 Globigerinoides obliquus Bolli. - Srinivasan : p.145 pl. 2; fig. 2-3
Chaisson & Leckie (1993):
1957 Globigerinoides obliqua Bolli. - Bolli : p.113 pl. 25; fig. 10a-c
1983 Globigerinoides obliquus Bolli. - Kennett & Srinivasan : p.56 pl. 11; fig. 7-9
1993 Globigerinoides obliquus Bolli. - Chaisson & Leckie : p.170 pl. 2; fig. 1-2
Stratigraphy - absolute ages:
LAD: 1.31 ± 0.05 [Ma], Chaisson & d'Hondt (2000) ODP Leg 165 Site 999
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

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

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

Chaisson,W.P. and Pearson,P.N. (1997):
Planktonic foraminifer biostratigraphy at Site 925: middle Miocene–Pleistocene.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 154 Eds: Shackleton, N.J.Curry, W.B.Richter, C.Bralower, T.J.

Chaisson,W.P. and d'Hondt,S.L. (2000):
Neogene planktonic foraminifer biostratigraphy at Site 999, Western Caribbean Sea.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 165 Eds: Leckie, R.M.Sigurdsson, H.Acton, G.D.Draper, G. p. 19-56
Anonymous: Unedited TaxonConcept data
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