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Species Globigerinella obesa Bolli 1957


Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test low trochospiral, equatorial periphery strongly lobulate; axial periphery broadly rounded; chambers spherical, strongly inflated, four to four and one-half rapidly increasing chambers in the final whorl, sutures radial, depressed; surface densely perforated with circular to subcircular pores and elevated circular spine bases . On early chambers, the spine bases tend to coalesce into regular ridges. Umbilicus wide, deep; aperture a low to medium arch without a lip or rim, interiomarginal, umbilical-extraumbilical.
Discussion / Comments:
Van Eijden & Smit (1991):
Remarks. G. obesa is rare in many late Oligocene faunas.
Spezzaferri & Silva (1990):
This species possesses a pole-like spines in a flat wall like true Globigerina, then it cannot belong to the genus Globorotalia. Its taxonomic position, however, is still uncertain, because it evolves into Globigerinella praesiphonifera (Premoli Silva and Spezzaferri, 1990).
Chaisson & Leckie (1993):
Remarks: This species is rare. Globigerinella pseudobesa is included under the Globigerinella obesa species concept. Bolli and Saunders (1985) do not show this species ranging above the top of Zone N15. Similar species: The chambers of Globigerinella obesa are more inflated and more embracing than those of G. calida. G. obesa is distinquished from lower Miocene Tenuitella munda by its larger size and more coarsely perforate wall.
Systematics:

22
 Genus Globigerinella
  Species Globigerinella obesa

32
 Ordo Foraminiferida
  Familia Globorotaliidae
   Genus Globigerinella
    Species Globigerinella obesa
Synonym list:
Kennett & Srinivasan (1983):
1957 Globorotalia obesa Bolli. - Bolli : p.119 pl 29 figs 2a-3
Van Eijden & Smit (1991):
1957 Globorotalia obesa Bolli. - Bolli : p.119 pl. 29, figs. 2-3
1991 Globigerinella obesa Bolli. - Van Eijden & Smit : p.112
Spezzaferri & Silva (1990):
1957 Globigerinella obesa Bolli. - Bolli : pl. 29; fig. 2a-3
1990 Globigerinella obesa Bolli. - Spezzaferri & Silva : p.251 pl. XI; fig. 3a-c
Chaisson & Leckie (1993):
1957 Globorotalia obesa Bolli. - Bolli : p.119 pl. 29; fig. 2a-3
1983 Globigerinella obesa Bolli. - Kennett & Srinivasan : p.234 pl. 59; fig. 2-5
1993 Globigerinella obesa Bolli. - Chaisson & Leckie : p.169 pl. 1; fig. 3-4
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

Kennett,J. and Srinivasan,M.S. (1983):
Neogene Planktonic Foraminifera - A Phylogenetic Atlas.

Spezzaferri,S. and Silva,I.S.. (1990):
Oligocene planktonic foraminiferal biostratigraphy and paleoclimatic interpretation from Hole 538A, DSDP Leg 77, Gulf of Mexico . Palaeogeography, Palaeoclimatology, Palaeoecology Vol. 83 p. 217-263

Van Eijden,A.J.M. and Smit,J. (1991):
Eastern Indian Ocean Cretaceous and Paleogene quantitative biostratigraphy.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 121 Eds: Weissel, J.Peirce, J.Taylor, E.Alt, J. p. 77-123

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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