CATALOG OF ORIGINAL DESCRIPTIONS: Globigerinoides diminuta Bolli 1957
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Original Description 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 2½ 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. Size: Largest diameter of holotype 0.27 mm. Extra details from original publication Remarks: 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)
References:
Bolli, H. M. (1957b). Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, B.W.I. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli & E. Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin . 215: 97-123. gs
Globigerinoides diminuta compiled by the pforams@mikrotax project teamviewed: 1-5-2025
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Bolli1957 pl25-11.JPG_USNM 5638_holo.jpg)
diminuta(G)_USNM 5638_holo.jpg
Bolli1957 pl25-11.JPG_USNM 5638_holo.jpg)
diminuta(G)_USNM 5638_holo.jpg
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