Globorotalia (Menardella) exilis Blow 1969 from: Kennett, J.Srinivasan, M.S. (1983): Neogene Planktonic Foraminifera - A Phylogenetic Atlas. . |
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Species Globorotalia (Menardella) exilis Blow 1969 |
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Alternative name: |
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Diagnosis / Definition: |
Kennett & Srinivasan (1983):
Test large, thin, delicate, lenticular trochospire, five to seven chambers in the final whorl, equatorial periphery lobulate, axial periphery acute with thin keel; sutures
on spiral side recurved, generally overlapped by succeeding chambers, limbate, merging into keel; umbilical side radial, depressed;
surface smooth, finely perforate ;umbilicus narrow, deep; aperture a low-arched slit, interiomarginal, umbilical-extraumbilical. |
Discussion / Comments: |
Kennett & Srinivasan (1983):
Gr. (Menardella) exilis is distinguished from Gr. (M.) limbata by having a more compressed, thinner, and delicate test.
This species is closely related to Gr. (M.)pertenuis, which is larger and has a distinctly more lobate and compressed test. |
Synonym list: |
Kennett & Srinivasan (1983):
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Was used in synonym list of: |
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References: |
Blow,W.H. (1969): Late middle Eocene to Recent planktonic foraminiferal biostratigraphy. In: Proceedings of the First International Conference on Planktonic Microfossils, Geneva 1967 Vol. 1 Eds: Bronnimann, P.Renz, H.H. p. 199-422
Kennett,J. and Srinivasan,M.S. (1983): Neogene Planktonic Foraminifera - A Phylogenetic Atlas.
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