CATALOG OF ORIGINAL DESCRIPTIONS: Globigerinoides diminuta Bolli 1957

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> G -> Globigerinoides -> Globigerinoides diminuta
Other pages this level: G. altiaperturus praealtiaperturus, G. apertasuturalis, G. bannerblowi, G. bispherica, G. bollii, G. bradyi grandis, G. bulloideus, G. cancellata, G. canimarensis, G. conglobatus altihelix, G. consuelensis, G. diminuta, G. dinapolii, G. elongata bikiniensis, G. elongata cedrosensis, G. emeisi, G. eoconglobatus, G. fournieri, G. fragilis, G. glomerosa, G. glomerosa circularis, G. glomerosa curva, G. glomerosa glomerosa, G. haitiensis anterubra, G. haitiensis compactus, G. haitiensis compressus, G. haitiensis epityche> >>

Globigerinoides diminuta

Citation: Globigerinoides diminuta Bolli 1957
Rank: Species
Type locality: Globigerinatella insueta zone, Trinidad, core 7,419-39 feet of United British Oilfields of Trinidad, Ltd. (now Shell Trinidad, Ltd.), well Penal No. 92.
Type age (chronostrat): Globigerinatella insueta zone.
Type sample (& lithostrat): Cipero formation:
Type specimens: P5638
Type repository: Washington; USNM

Linked specimens: USNM-5638

Current identification/main database link: Globigerinoides diminutus Bolli, 1957


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
RemarksGlobigerinoides 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 V O


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Globigerinoides diminuta compiled by the pforams@mikrotax project team viewed: 17-1-2021

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