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Species Globorotalia renzi Bolli 1957 |
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| Diagnosis / Definition: |
Bolli (1957):
Shape of test very low trochospiral; equatorial periphery almost circular, only very slightly lobate; axial periphery angular with a thin keel. Wall calcareous, finely perforate, surface smooth or very finely pitted. Chambers strongly compressed; 15-18, arranged in about 2 1/2 whorls; the chambers of the last whorl, usually 6 in number, increase fairly rapidly in size. Sutures on spiral side curved; on umbilical side radial or very slightly curved, slightly depressed between last chambers. Umbilicus very narrow, shallow. Aperture a low arch, often with a distinct lip, interiomarginal, umbilical extraumbilical. Coiling almost 100 percent dextral throughout the observed range in the Navet formation. Largest diameter of holotype 0.23 mm. |
| Discussion / Comments: |
Bolli (1957):
Globorotalia renzi Bolli, new species, is distinguished from G. lehneri Cushman and Jarvis by its small size and spineless periphery. It usually has 6 chambers in the last whorl compared with 4-5 in small specimens of G. lehneri. The species is named for Dr. H. H. Renz of the Mene Grande Oil Company, in recognition of his contributions to micropaleontology in the Caribbean region. |
| Systematics: |
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Genus Globorotalia
Species Globorotalia aspensis
Species Globorotalia broedermanni
Species Globorotalia renzi
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| Synonym list: |
Bolli (1957):
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| References: |
Bolli,H.M. (1957):
Planktonic Foraminifera from the Eocene Navet and San Fernando formations of Trinidad, B.W.I. . Bull. U.S. natl. Mus. Vol. 215 p. 155-172
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