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Species Globorotalia (Menardella) multicamerata Cushman & Jarvis 1930 | ||||||
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| Diagnosis / Definition: | ||||||
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Kennett & Srinivasan (1983): Test a large, low trochospiral, compressed, equatorial periphery weakly lobulate; axial periphery acute with a prominent cordlike keel; eight to ten chambers of the final whorl, increasing very slowly in size; sutures on spiral side limbate, curving backward to merge into peripheral keel, on umbilical side almost radial and depressed; surface uniformly and densely perforate, pustulose near umbilicus; umbilicus a distinct circular pit; aperture interiomarginal, extraumbilical- umbilical, a low slit bordered by a distinct lip. |
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| Discussion / Comments: | ||||||
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Kennett & Srinivasan (1983): Gr. (M.) multicamerata is closely related to Gr. (M.) limbata from which it differs by an increase in the number of final chambers (usually eight to ten), circular out line of the test, and by its wide, circular, and deep umbilicus. A continuous morphological intergradation exists between typical Gr. (M.) limbata and Gr. (M.) multicamerata, and the distinction between these species is somewhat difficult to recognize, especially in Late Miocene Zone N17B. The evolution of Gr. (M.) multicamerata from Gr. (M.) limbata is a useful biostratigraphic datum within Zone N17, close to the first evolutionary appearance of Pulleniatina primalis. |
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| Kennett & Srinivasan (1983): 1930 Globorotalia menardii var. multicamerata Cushman & Jarvis. - Cushman & Jarvis : p.367 pl 34 figs 8 a-c
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| References: | ||||||
Cushman,J.A. and Jarvis,P.W. (1930): Kennett,J. and Srinivasan,M.S. (1983): |
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| Anonymous: Unedited TaxonConcept data | ||||||
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