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Species Globorotalia (Fohsella) praefohsi Blow & Banner 1966 |
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| Diagnosis / Definition: |
Kennett & Srinivasan (1983):
Test low trochospiral, equatorial periphery slightly lobulate, axial periphery acute with a partly developed keel on last two chambers; chambers compressed, six to seven
in the final whorl, increasing slowly in size; sutures on spiral side curved, gently raised, on umbilical side curved to radial, depressed;
surface distinctly and uniformly perforate; umbilicus narrow, aperture umbilicalextraumbilical with a low arch bordered by a prominent lip. |
| Discussion / Comments: |
Kennett & Srinivasan (1983):
Gr. (F.) praefohsi differs from Gr. (F.)peripheroacuta in possessing a keel (imperforate carina) in the last one or two chambers of the final whorl. It differs from Gr. (F.) fohsi fohsi in exhibiting a keel only on the last few chambers. The early chambers of the final whorl are noncarinate. Thus Gr. (F.) praefohsi is a partly keeled form between nonkeeled
intermediate Gr. (F.) peripheroacuta and the fully keeled Gr. (F.) fohsi fohsi. |
| Synonym list: |
Kennett & Srinivasan (1983):
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| References: |
Blow,W.H. and Banner,F.T. (1966):
The morphology, taxonomy and biostratigraphy of Globorotalia barisanensis LeRoy, Globorotalia fohsi Cushman and Ellisor, and related taxa . Micropaleontology Vol. 12(3) p. 286-302
Kennett,J. and Srinivasan,M.S. (1983):
Neogene Planktonic Foraminifera - A Phylogenetic Atlas.
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