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Species Sphaeroidinella grimsdalei Keijzer 1945


Discussion / Comments:
Bolli (1957):
Sphaeroidinella grimsdalei is rather variable in size and in number of chambers comprising the final whorl. Stratigraphically early specimens are usually small with 3 chambers in the last whorl. During the course of evolution, the tests tend to become larger and the last whorl may consist of 3 and 4, occasionally even 5 or 6, chambers. Sphaeroidinella rutschi Cushman and Renz probably branched off from Sphaeroidinella grimsdalei. An apparently transitional form is shown on plate 26, figures 13a, b (USNM P5646).
Systematics:

21
 Genus Sphaeroidinella
  Species Sphaeroidinella grimsdalei
Synonym list:
Bolli (1957):
1945 Sphaeroidinella grimsdalei Keijzer. - Keijzer : p. 205 pl. 21, text-figs. 33a-d
1945 Globigerina cf. digitata Brady. - Cushman & Stainforth : p. 68 pl. 13, figs. 5a-b
1949 Globigerina digitata Brady. - Bermudez : p. 280 pl. 21, figs. 54-55
1949 Sphaeroidinella grimsdalei Keijzer. - Bermudez : p.281 pl. 21, figs. 56-57
1957 Sphaeroidinella grimsdalei Keijzer. - Bolli : pl. 26, figs. 8-12c
References:

Cushman,J.A. and Stainforth,R.M. (1945):
The foraminifers of the Cipero Marl Formation of Trinidad, British West Indies . Journal of Foraminiferal Research Vol. 14 p. 1-75

Keijzer,F.G. (1945):
Outline of the geology of the eastern part of the province of Oriente, Cuba (E. of 76° W.L.), with notes on the geology of other parts of the island.. , Geographische en Geologische Mededelingen, Physiographisch-Geoloogische Reeks Ser II Vol. 6 p. 1-239

Bermudez,P.J. (1949):
Tertiary smaller foraminifers of the Dominican Republic . Spec. Publ.Cushman Lab. Foraminiferal Res., Vol. 25 p. 1-322

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
Anonymous: Unedited TaxonConcept data
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