Globigerinoides bollii Blow 1959 from: Quilty, P.G.. (1976): Planctonic foraminifera DSDP Leg 34- Nazca Plata . DSDP initial reports Vol. 34 | . |
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Species Globigerinoides bollii Blow 1959 |
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| Diagnosis / Definition: |
Kennett & Srinivasan (1983):
Test small, compact, trochospire with four chambers in the final whorl; chambers subspherical to ovate, much embracing;
sutures on both sides radial to curved, depressed, surface coarsely cancellate; umbilicus small, primary aperture interiomarginal, umbilical, almost circular, generally small, supplementary apertures on spiral side sutural, small. |
| Discussion / Comments: |
Kennett & Srinivasan (1983):
Gs, bollii differs from Gs. parawoodi in having much more embracing chambers, a small, almost circular primary aperture, and smaller test. Early forms of this species show only one supplementary aperture as in Gs. parawoodi, but later forms have two supplementary apertures. Gs. bollii seems to have
evolved from Globigerina (Zeaglobigerina) woodi in the Middle Miocene.
Bolli & Saunders (1985):
This species is characterized by strongly embracing chambers and by an almost completely circular and rather small primary aperture. There is usually one small supplementary aperture; an additional second one may be present between the penultimate and antepenultimate chamber. Primary and supplementary apertures tend to become larger in stratigraphically younger specimens. According to its author the species first appears within the Globorotalia praefohsi (N 11) and ranges up to the Globorotalia tosaensis tenuitheca (N 21) Zone. Therefore, the first appearance of G. bollii could represent a useful datum in the Mediterranean region where the G. fohsi lineage is not developed. However, it is well documented in that area only from the Sphaeroidinellopsis subdehiscens subdehiscens Globigerina druryi Zone (N 13). The species seems to have become extinct in the Mediterranean area in the Early Pleistocene (Borsetti et al., 1979) but was already rare by the Late Pliocene.
Srinivasan (1975):
Distinguished by small test, almost circular
primary aperture, and dorsal supplementary aperture.
Chaisson & Leckie (1993):
Similar species: The primary aperture of Globigerinoides bollii is over a
chamber in the final whorl like that of G. obliquus rather than a suture. G.
obliquus, however, has less embracing chambers, its final chamber is more
nearly the size of others in the final whorl, and its primary aperture is laterally
oblong. G. bollii is more compact than G. parawoodi. |
| Synonym list: |
Kennett & Srinivasan (1983):
Bolli & Saunders (1985):
Srinivasan (1975):
Chaisson & Leckie (1993):
Quilty (1976):
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| References: |
Blow,W.H. (1959):
Age, correlation and biostratigraphy of the upper Tocuyo (San Lorenzo) and Pozón Formations, eastern Falcon, Venezuela . Bull. Am. Paleontol. Vol. 39(178) p. 67-252
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.
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
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
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