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Globigerina prolata 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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Anonymous: Unedited TaxonConcept data
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Species Globigerina prolata Bolli 1957


Diagnosis / Definition:
Bolli (1957):
Shape of test low trochospiral, biconvex. Equatorial periphery elongate, distinctly lobate. Axial periphery rounded. Wall calcareous, perforate, surface smooth. Chambers inflated globular to slightly compressed; about 12, arranged in 2 1/2 whorls, the 4 5 chambers of the last whorl increasing rapidly in size. Sutures on spiral side radial or slightly oblique, depressed; on umbilical side radial, depressed. Umbilicus fairly wide, open. Apertures distinct arches, interiomarginal, umbilical; in some specimens the aperture of the last chamber tends to become extraumbilical umbilical in position. Coiling in two thirds of the specimens counted in the Globorotalia aragonensis zone, sinistral. Largest diameter of holotype 0.40 mm.
Discussion / Comments:
Bolli (1957):
Globigerina prolata Bolli, new species, probably branched off from G. collactea Finlay in the Globorotalia rex zone. It became fairly common in the Globorotaha formosa formosa and Globorotalia aragonensis zones. Bronnimann (1952) figured and described this species as Globigerina pseudobulloides Plummer. Because of the interiomarginal, extraunibilical umbilical position of its apertures, pseudobulloides is now placed in Globorotalia. Globigerina prolata differs from Globorotalia pseudobulloides in the umbilical position of the apertures, absence of a flaring lip in the last chamber, and more trochospiral arrangement of the chambers. Also it has a distinctly different stratigraphic range. Globorotalia pseudobulloides is restricted to the Paleocene (Globorotalia trinidadensis to the Globorotalia pusilla pusilla zones) and Globigerina prolata to the lower Eocene (Globorotalia rex to the Globorotalia aragonensis zones).
Systematics:

20
 Genus Globigerina
  Species Globigerina prolata

24
  Genus Globigerina
   Species Globigerina turgida
Synonym list:
Bolli (1957):
non 1926 Globigerina pseudobulloides Plummer. - Plummer :
1952 Globigerina pseudobulloides Plummer. - Brönnimann : pp. 21-23 pl. 3, figs. 7-9 not Plummer 1926
Bolli (1957):
1952 Globigerina pseudobulloides Plummer. - Brönnimann : pp. 21-23 pl. 3, figs. 7-9
1957 Globigerina prolata Bolli. - Bolli : pl. 15, figs. 24-26 new species
1957 Globigerina prolata Bolli. - Bolli : p. 272 pl. 35, figs. 7a-b
Was used in synonym list of:
References:

Plummer,H.J. (1926):
Foraminifera of the Midway Formation in Texas . University of Texas Bulletin Vol. 2644(1) p. 1-206

Brönnimann,P. (1952):
Trinidad Paleocene and lower Eocene Globigerinidae . Bulletins of American paleontology Vol. 34(143) p. 1-34

Bolli,H.M. (1957):
The genera Globigerina and Globorotalia in the Paleocene-Lower Eocene Lizard Springs Formation of Trinidad, B.W.I . Bulletin of the U.S. National Museum Vol. 215 p. 61-82

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
Anonymous: Unedited TaxonConcept data
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