Globigerina ciperoensis angustiumbilicata Bolli 1957 from: 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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Subspecies Globigerina ciperoensis angustiumbilicata Bolli 1957 |
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| Diagnosis / Definition: |
Bolli (1957):
Shape of test very low trochospiral; equatorial periphery distinctly lobate, axial periphery rounded. Wall calcareous, perforate, surface smooth or very finely pitted. Chambers spherical; about 12, arranged in about 2 1/2 whorls; the 4-5 chambers of the last whorl increase moderately to fairly rapidly in size. Sutures on spiral side depressed, radial; on umbilical side depressed, radial. Umbilicus small. Aperture a medium to low arch; interiomarginal, umbilical, often with a thin lip. Coiling random. Largest diameter of holotype 0.24 mm. |
| Discussion / Comments: |
Bolli (1957):
Globigerina ciperoensis angustiumbilicata, new subspecies, is distinguished from G. ciperoensis ciperoensis by having a small umbilicus. The aperture, which is umbilical in position, may in some specimens show a tendency towards an umbilical extraumbilical position. |
| Synonym list: |
Bolli (1957):
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| References: |
Bolli,H.M. (1957):
Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, B.W.I..
In: Studies in Foraminifery, Bulletin of the U.S. National Museum Vol. 215 Eds: Loeblich, A.R.Tappan, H.Beckmann, J.P.Bolli, H.M.Gallitelli, E.M.Troelsen, J.C. p. 97-123
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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