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Species Globorotalia pseudomayeri Bolli 1957 |
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| Diagnosis / Definition: |
Bolli (1957):
Shape of test low trochospiral; equatorial periphery slightly lobate; axial periphery rounded. Wall calcareous, perforate, surface very finely pitted. Chambers spherical; 10-12, arranged in about 2% whorls; The 4 or 5 chambers of the last whorl increase fairly rapidly in size. Sutures on spiral side curved or oblique in early portion, later radial, depressed; on umbilical side radial, depressed. Umbilicus narrow. Aperture a medium to low arch, with or without a faint lip; interiomarginal, umbilical extraumbilical. Coiling random. Largest diameter of holotype 0.4 mm. |
| Discussion / Comments: |
Bolli (1957):
Globorotatia pseudomayeri, new species, is morphologically very close to G. opima nana Bolli and G. mayeri Cushman and Ellisor. It differs from the former in that the chambers of the last whorl increase more rapidly in size. The last whorl consists of 4 to 4 1/2 chambers, whereas in G. mayeri it has 5 or 6. G. pseudomayeri is restricted to the Hantkenina aragonensis zone of the Navet formation, whereas 0. opima nana is found from the Truncorotaloides rohri zone, Navet formation to the Globigerina ciperoensis ciperoensis zone, Cipero formation. Globorotalia mayeri is restricted to the Cipero formation and lower part of the Lengua formation. |
| Systematics: |
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Genus Globorotalia
Species Globorotalia pseudomayeri
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| Synonym list: |
Bolli (1957):
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| Was used in synonym list of: |
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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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