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Species Globorotalia (Hirsutella) theyeri Fleisher 1974 | ||||||
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| Diagnosis / Definition: | ||||||
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Kennett & Srinivasan (1983): Test large, thin, planoconvex to unequally biconvex, equatorial periphery lobulate with markedly flaring chambers in the final whorl; axial periphery acute, with thin, discontinuous peripheral keel; four to five chambers in the final whorl, increasing moderately to rapidly in size; spiral sutures strongly recurved, depressed, on umbilical side gently curved, to radial, depressed; surface finely and uniformly perforate; umbilicus large, deep; aperture interiomarginal, umbilical-extraumbilical a low arch bordered by a distinct but thin lip. |
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| Discussion / Comments: | ||||||
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Kennett & Srinivasan (1983): Gr. (H.) theyeri evolved from Gr.(H.) margaritae from which it is distinguished by its distinctly flattened spiral side, its flaring chambers of the final whorl, and a relatively large umbilicus. This species differs from Gr. (H.) scitula in having a distinct but thin peripheral keel and more strongly recurved spiral sutures. |
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| Kennett & Srinivasan (1983): 1974 Globorotalia theyeri Fleisher. - Fleisher : p.1028 pl 12 fig 9 pl 13
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| References: | ||||||
Fleisher,R.L. (1974): Kennett,J. and Srinivasan,M.S. (1983): |
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| Anonymous: Unedited TaxonConcept data | ||||||
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