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Species Globorotalia (Truncorotalia) tosaensis Takayangi & Saito 1962 |
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| Diagnosis / Definition: |
Kennett & Srinivasan (1983):
Test low trochospiral, spiral side flat to concave, umbilical side strongly convex giving the test a conical appearance; equatorial periphery almost circular; axial periphery subrounded to subacute; chambers inflated,
commonly five in the final whorl, increasing fairly rapidly in size; sutures on spiral side gently curved and somewhat flush to gently depressed, on umbilical side almost radial,
depressed, surface finely perforate, pustulate on umbilical side and on early chambers on spiral side; umbilicus narrow, deep; aperture interiomarginal, extraumbilical-umbilical, a
low slit bordered by a lip. |
| Discussion / Comments: |
Kennett & Srinivasan (1983):
Gr. (T.) tosaensis resembles Gr. (T.) truncatulinoides in general appearance but is distinguished primarily by the absence of a peripheral keel . It differs from Gr. (T.) crassaformis in its rounded equatorial profile and by having more than four chambers in the final whorl. |
| Synonym list: |
Kennett & Srinivasan (1983):
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| Was used in synonym list of: |
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| References: |
Takayanagi,Y. and Saito,T. (1962):
Planktonic foraminifers from the Nobori Formation, Shikoku, Japan. . Science Reports of the Tohoku University Serie 2 Vol. 5 p. 67-106
Kennett,J. and Srinivasan,M.S. (1983):
Neogene Planktonic Foraminifera - A Phylogenetic Atlas.
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