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Species Globigerinoides diminuta Bolli 1957


Diagnosis / Definition:
Bolli (1957):
Shape of test trochospiral; equatorial periphery almost subquadrate; axial periphery rounded. Wall calcareous, perforate, surface finely pitted. Chambers spherical in early stages, later becoming laterally somewhat compressed; about 10, arranged in about 2 1/2 whorls; the 3 chambers of the last whorl increase moderately in size. Sutures on spiral side radial, slightly depressed; on umbilical side radial, slightly depressed. Umbilicus small. Primary aperture small, almost circular, symmetrically above the suture line of the two previous chambers; interiomarginal, umbilical; supplementary sutural apertures, usually 2 of which are visible, are of similar shape and occupy the same symmetrical position over the sutures of earlier chambers. Coiling ?random. Largest diameter of holotype 0.27 min.
Discussion / Comments:
Bolli (1957):
Globigerinoides diminuta, new species, is separated from Globigerinoides rubra (d'Orbigny) by its constantly very small size and more compact shape. The position of the apertures symmetrically above the suture between two earlier chambers is a characteristic feature in both species. In contrast to Globigerinoides rubra, the new species is confined to the Globigerinatella insueta zone (probably to the lower part).
Synonym list:
Bolli (1957):
1957 Globigerinoides diminuta Bolli. - Bolli : pl. 25, figs. 11a-c new species
Was used in synonym list of:
Globigerinoides diminutus Bolli 1957
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
Anonymous: Unedited TaxonConcept data
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