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Species Globorotalia plesiotumida Blow & Banner 1965


Alternative name:
Globorotalia (Globorotalia) plesiotumida Blow & Banner 1965
Discussion / Comments:
Chaisson & Pearson (1997):
Specimens at the LO of this species are very close to Globorotalia tumida. They are relatively large with secondary encrusting calcite, but they retain a flat spiral side. Specimens in Sample 154-925B-13H-3, 60-62 cm, do not have the typical final chamber (radial length > tangential width), but the spiral side is flat and the test is ovate in umbilical view.
Chaisson & Leckie (1993):
Remarks: In umbilical view, Globorotalia plesiotumida is oblate in general outline. Its chambers are highly vaulted on the umbilical side. Its spiral side may be nearly flat to slightly convex, making it distinctively asymmetrical in edge view. Similar species: The proportions of the final chamber (see G. merotumida) are the most reliable character for distinguishing this species from G. merotumida. The final chamber of G. plesiotumida often looks more lobate and protruding than earlier chambers because of its greater radial length to width ratio. G. plesiotumida is distinguished from its descendent G. tumida by its generally smaller size, less tumid test, more pronounced asymmetrical edge view, and thinner peripheral keel. G. plesiotumida is generally intermediate in size between G. merotumida and G. tumida.
Systematics:

1
 Superregnum Eukaryota
  Regnum Protoctista
   Phylum Ciliophora
    Subphylum Postciliodesmatophora
     Ordo Globigerinida
      Superfamilia Globorotaliaceae
       Superfamilia Nonionacea
        Familia Globorotaliidae
         Genus Globorotalia
          Species Globorotalia plesiotumida
Synonym list:
Chaisson & d'Hondt (2000):
1965 Globorotalia tumida plesiotumida Blow & Banner. - Banner & Blow : p.1353 figs 2a-c
1983 Globorotalia (Globorotalia) plesiotumida Blow & Banner. - Kennett & Srinivasan : p.156 pl 37 figs 7-9
1985 Globorotalia plesiotumida Blow & Banner. - Bolli & Saunders : p.227 fig. 33
Bolli & Saunders (1985):
1965 Globorotalia (Globorotalia) tumida plesiotumida Blow & Banner. - Banner & Blow : p.1353 figs. 2a-c For taxonomic remarks see discussion under G. merotumida
1985 Globorotalia plesiotumida Blow & Banner. - Bolli & Saunders : p.225 figs. 33.5; 6,10,12
Chaisson & Pearson (1997):
1965 Globorotalia (Globorotalia) tumida plesiotumida Blow & Banner. - Banner & Blow : p.1353 fig. 2a-c
1983 Globorotalia (Globorotalia) plesiotumida Blow & Banner. - Kennett & Srinivasan : p.156 pl. 37, fig. 7-9
1985 Globorotalia plesiotumida Blow & Banner. - Bolli & Saunders : p.227 fig. 33.5
Vincent & Toumarkine (1990):
1965 Globorotalia (Globorotalia) tumida plesiotumida Blow & Banner. - Banner & Blow : p. 1353 fig.3
1990 Globorotalia plesiotumida Blow & Banner. - Vincent & Toumarkine : p. 803
Chaisson & Leckie (1993):
1965 Globorotalia (Globorotalia) tumida plesiotumida Blow & Banner. - Banner & Blow : p.1353 fig. 2a-c
1983 Globorotalia (Globorotalia) plesiotumida Blow & Banner. - Kennett & Srinivasan : p.156 pl. 37; fig. 7-9
1985 Globorotalia plesiotumida Blow & Banner. - Bolli & Saunders : p.227 fig. 33.5
1993 Globorotalia plesiotumida Blow & Banner. - Chaisson & Leckie : p.175 pl. 7; fig. 1-2 and 6-10
Stratigraphy - absolute ages:
FAD: 8.3 ± 0 [Ma], Berggren et al. (1995)
LAD: 3.84 ± 0.06 [Ma], Chaisson & d'Hondt (2000) ODP Leg 165 Site 999
LAD: 3.77 ± 0 [Ma], Chaisson & Pearson (1997) ODP Leg 154 Site 925
FAD: 8.58 ± 0 [Ma], Chaisson & Pearson (1997) ODP Leg 154 Site 925
References:

Banner,F.T. and Blow,W.H. (1965):
Two new taxa of the Globorotaliinae (Globigerinacea, Foraminfera) assisting determination of the late Miocene/middle Miocene boundary . Nature Vol. 207

Banner,F.T. and Blow,W.H. (1965):
Progress in the planktonic foraminiferal biostratigraphy of the Neogene . Nature Vol. 208 p. 1164-66

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

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
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