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Species Globigerinoides bollii Blow 1959 | ||||||
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| Diagnosis / Definition: | ||||||
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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. |
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| Discussion / Comments: | ||||||
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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. |
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| Synonym list: | ||||||
| Kennett & Srinivasan (1983): 1959 Globigerinoides bollii Blow. - Blow : p.189 pl 10 figs 65 a-c
Bolli & Saunders (1985): 1959 Globigerinoides bollii Blow. - Blow : p.189 pl. 10, figs. 65a-c
1985 Globigerinoides bollii Blow. - Bolli & Saunders : p.193 fig. 20.8
Srinivasan (1975): 1959 Globigerinoides bollii Blow. - Blow : p.189 pl. 10; fig. 65a-c
1975 Globigerinoides bollii Blow. - Srinivasan : p.143 pl. 1; fig. 18-19
Chaisson & Leckie (1993): 1959 Globigerinoides bollii Blow. - Blow : p.189 pl. 10; fig. 65a-c
1983 Globigerinoides bollii Blow. - Kennett & Srinivasan : p.70 pl. 15; fig. 4-6
Quilty (1976): 1959 Globigerinoides bollii Blow. - Blow : p.189 pl. 10, figs. 65a-c
1976 Globigerinoides bollii Blow. - Quilty : p.675 pl. 5, figs. 17-18
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| References: | ||||||
Blow,W.H. (1959): Srinivasan,M.S. (1975): Quilty,P.G.. (1976): Kennett,J. and Srinivasan,M.S. (1983): Bolli,H.M. and Saunders,J.B. (1985): Chaisson,W.P. and Leckie,R.M. (1993): |
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| Anonymous: Unedited TaxonConcept data | ||||||
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