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Species Globorotalia (Truncorotalia) crassaformis Galloway & Wissler 1927 | ||||||
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| Diagnosis / Definition: | ||||||
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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. |
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| Discussion / Comments: | ||||||
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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 |
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| Kennett & Srinivasan (1983): 1927 Globigerina crassaformis Galloway & Wissler. - Galloway & Wissler : p.41 pl 7 fig 12
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| References: | ||||||
Galloway,J.J. and Wissler,S.G. (1927): Kennett,J. and Srinivasan,M.S. (1983): |
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| Anonymous: Unedited TaxonConcept data | ||||||
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