Globorotalia (Truncorotalia) crassaformis Galloway & Wissler 1927 from: Kennett, J.Srinivasan, M.S. (1983): Neogene Planktonic Foraminifera - A Phylogenetic Atlas. | . |
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Species Globorotalia (Truncorotalia) crassaformis Galloway & Wissler 1927 |
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| Diagnosis / Definition: |
Kennett & Srinivasan (1983):
Test low trochospiral, spiral side almost flat, umbilical side strongly convex, equatorial periphery slightly lobulate, subquadrate; axial periphery planoconvex, subacute to subrounded; chambers compressed, four in the final whorl, increasing rapidly in size; sutures on spiral side curved, depressed;
on umbilical side almost radial, depressed; surface finely perforate, pustulate on umbilical as well as spiral side; umbilicus narrow, deep; aperture interiomarginal, extraumbilical-umbilical, a low-arched slit bordered by a lip. |
| Discussion / Comments: |
Kennett & Srinivasan (1983):
Gr. (T.) crassaformis shows a wide range of variation in size, from rounded to keeled periphery, thin-walled to thick-walled test, and the degree of compactness. Different subspecific nomenclature such as oceanica Cushman and Bermudez, 1949; ronda Blow, 1969; viola Blow, 1969, and hessi Bolli and Premoli Silva, 1973, have been proposed to
reflect these variations. All of these forms are characterized by four chambers in the final whorl and quadrate arrangement of quasiscituline shaped chambers |
| Synonym list: |
Kennett & Srinivasan (1983):
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| References: |
Galloway,J.J. and Wissler,S.G. (1927):
Pleistocene foraminifers from the Lomita Quarry, Palos Verdes Hills, California . Journal of Paleontology Vol. 1
Kennett,J. and Srinivasan,M.S. (1983):
Neogene Planktonic Foraminifera - A Phylogenetic Atlas.
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