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Species Globorotalia broedermanni Cushman & Bermudez 1949 | ||||||
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| Diagnosis / Definition: | ||||||
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Bolli (1957): Shape of test biconvex, low trochospiral, moderately compressed; equatorial periphery nearly circular; axial periphery rounded to subangular. Wall calcareous, perforate, surface covered with short spines. Chambers subangular, inflated; about 12-15, arranged in 2 1/2 -3 whorls, the 5-6 chambers of the last whorl increasing slowly in size. Sutures on spiral side curved, slightly depressed between last chambers of final whorl; on umbilical side radial, slightly depressed. Umbilicus narrow, open. Aperture a low arch; interiomarginal, extraumbilical umbilical. Coiling over 90 percent dextral. Largest diameter of hypotype 0.33 mm. |
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| Discussion / Comments: | ||||||
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Bolli (1957): The origin of Globorotalia broedermanni Cushman and Bermudez cannot be traced in the Trinidad sections. The species appears at the base of the Globorotalia rex zone apparently fully developed and with a strong preference for dextral coiling (indicating an advanced evolutionary stage). A marked faunistic change between the Globorotalia rex zone and the older Globorotalia velascoensis zone indicates a hiatus in the studied sections. It is in this missing interval that possible ancestral forms of Globorotalia broedermanni have to be sought. |
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| Systematics: | ||||||
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20 Genus Globorotalia Species Globorotalia compressa Species Globorotalia velascoensis 24 Genus Porticulasphaera Species Globigerapsis index Species Globorotalia aspensis Species Globorotalia broedermanni Species Porticulasphaera mexicana |
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| Synonym list: | ||||||
| Bolli (1957): 1949 Globorotalia broedermanni Cushman & Bermudez. - Cushman & Bermudez : p. 40 pl. 7, figs. 22-24
1957 Globorotalia broedermanni Cushman & Bermudez. - Bolli : pl. 19, figs. 13-15
Bolli (1957): 1949 Globorotalia (Truncorotalia) broedermanni Cushman & Bermudez. - Cushman & Bermudez : p. 40 pl. 7, figs. 22-24
1957 Globorotalia broedermanni Cushman & Bermudez. - Bolli : p. 274 pl. 37, figs. 13a-c
1957 Globorotalia broedermanni Cushman & Bermudez. - Bolli : p. 80 pl. 19, figs. 13-15
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| References: | ||||||
Cushman,J.A. and Bermudez,P.J. (1949): Bolli,H.M. (1957): Bolli,H.M. (1957): |
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| Anonymous: Unedited TaxonConcept data | ||||||
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