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Species Globorotalia (Globoconella) sphericomiozea Walters 1965 | ||||||
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| Diagnosis / Definition: | ||||||
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Kennett & Srinivasan (1983): Test low trochospiral, almost flat on spiral side, umbilical side inflated, subconical, equatorial periphery quadrilobate, axial periphery rounded, chambers angular, conical, four in the final whorl; sutures on spiral side slightly curved and depressed, on umbilical side gently sinuous to radial; surface may be obscured by secondary thickening on earlier chambers, finely perforate on final chamber; aperture a low arch, bordered by a rim, interiomarginal, umbilical-extraumbilical. |
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| Discussion / Comments: | ||||||
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Kennett & Srinivasan (1983): Gr. (G.) sphericomiozea is distin- guished from its ancestor Gr. (G.) conomiozea by its small, tightly coiled test, by having four rather than four and one-half chambers in the final whorl, and by rapid loss of the keel during its Stratigraphic range. In the earliest Pliocene, Gr. (G.) sphericomiozea evolved into Gr. (G.) puncticulata by further increases in the inflation of the chambers in the final whorl and rounding of the periphery and by a size increase. |
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| Kennett & Srinivasan (1983): 1965 Globorotalia miozea sphericomiozea Walters. - Walters : p.126 figs 8 n-s
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| References: | ||||||
Walters,R. (1965): Kennett,J. and Srinivasan,M.S. (1983): |
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| Anonymous: Unedited TaxonConcept data | ||||||
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