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Species Globorotalia (Hirsutella) challengeri Srinivasan & Kennett 1981 | ||||||
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| Diagnosis / Definition: | ||||||
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Kennett & Srinivasan (1983): Test a fairly low trochospiral, unequally biconvex, equatorial periphery lobate, axial periphery rounded or with a tendency to become subangular, wall calcareous, thin, coarsely perforate, surface smooth; chambers twelve to fifteen, arranged in three whorls, five to five and one-half chambers in the final whorl, which increase slowly in size; chambers strongly inflated especially in the later stage; rounded to ovate in shape; sutures on spiral side curved, depressed; on umbilical side slightly sinuous to radial, depressed; aperture a distinct arch, with a prominent lip, interiomarginal, umbilical-extraumbilical; coiling predominantly sinistral. |
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| Discussion / Comments: | ||||||
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Kennett & Srinivasan (1983): This species differs from its ancestor, Gr. (G.) praescitula, in exhibiting five to five and one-half rather than four and one-half chambers in the final whorl, more inflated chambers, and a more rounded periphery. The species is also morphologically similar to Gr. (J.) mayeri but differs in being less elongate in equatorial profile and in exhibiting a distinctly low-arched aperture. |
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| Kennett & Srinivasan (1983): 1981 Globorotalia challengeri Srinivasan & Kennett. - Srinivasan & Kennett : 499-533 pl1
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| References: | ||||||
Srinivasan,M.S. and Kennett,J.P. (1981): Kennett,J. and Srinivasan,M.S. (1983): |
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| Anonymous: Unedited TaxonConcept data | ||||||
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