CATALOG OF ORIGINAL DESCRIPTIONS: Globigerinoides glomerosa curva Blow 1956

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 glomerosa curva
Other pages this level: << < 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, G. haitiensis praerubra, G. haitiensis progomitulus, G. higginsi, G. hurgadaensis, G. hyalinus, G. index, G. indigena, G. inusitatus, G. italicus, G. japonicus> >>

Globigerinoides glomerosa curva

Citation: Globigerinoides glomerosa curva Blow 1956
Rank: sub-species
Type locality: auger line near Pozon, eastern Falcon, Venezuela.
Type age (chronostrat): Siphogenerina transversa zone
Type sample (& lithostrat): sample no. R. M. 19285, T. L. L. Cat. No. 130301, Pozon formation,
Type specimens: USNM 64587
Type repository: Washington, USNM ; paratypes in NHM London and NHM Basel

Linked specimens: USNM-64587 USNM-64588

Current identification/main database link: Praeorbulina curva (Blow, 1956)


Original Description
Test ovoid to nearlyspherical, with the last chamber semiglobular, inflated, and embracing between 40 and 70 per cent of the earlier test. Dorsal apertures of the penultimate and earlier chambers, and the apertures of the last chamber, are narrow slits lying in the sutures. Four to eight apertures present in the suture of the last chamber. Initial part rather indistinct, but the last, penultimate and third chambers clearly marked by fairly deeply incised sutures. The last chamber, which is umbilical in position, covers an open spire of ten to twelve semiglobular, vitreousearlierchamberswith large semicircular apertures. Wall composed of more than one layer; wall texture variable, last chamber often less coarsely cancellate than the earlier chambers.

Extra details from original publication
Remarks: Forms transitional to Globigerinoides bispherica occur. This subspecies differs from Globigerinoides bispherica in having an almost spherical test and in the more numerous apertures of the last chamber. It seems likely that some of the additional apertures of the last chamber were formed by constriction of the rather elongate apertures of Globigerinoides bispherica Todd (Todd, 1954).

Occurrence: This subspecies occurs in the uppermost part of the Globigerinatella insueta zone in the Brasso formation of Trinidad; it also occurs in the middle part of the Siphogenerina transversa zone in the Pozon formation of Falcon, Venezuela. It was abundant for a short time, persisted into the basal part of the Globorotalia fohsi barisanensis subzone, and then abruptly became extinct. It has also been found in sediments of corresponding age in the Bissex Hill formation of Barbados.

References:

Blow, W. H. (1956). Origin and evolution of the foraminiferal genus Orbulina d'Orbigny. Micropaleontology. 2(1): 57-70. gs


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Globigerinoides glomerosa curva compiled by the pforams@mikrotax project team viewed: 15-5-2021

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