References:
Blow, W. H. (1956). Origin and evolution of the foraminiferal genus Orbulina d'Orbigny. Micropaleontology. 2(1): 57-70. gs
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.
Current identification/main database link:
Original Description
Test ovoid to nearly spherical, with the last chamber nearly globular, inflated, and embracing the earlier part of the test to more than 40 per cent. Dorsal apertures of the penultimate and earlierchambersand the aperturesof the last chamber are short narrow slits or circular openings lying in the sutures but not in the area of the last chamber. Apertures of the last chamber are numerous. The last chamber covers the umbilicus and an open spire of ten to twelve semiglobular, vitreousearlierchambers. The ventral apertures of the penultimate and earlier chambers are large semi-circular openings with raised crescentic lips. Wall calcareous, composed of more than one layer, rather coarsely cancellate.
Extra details from original publication
Remarks: This form differs from Orbulina suturalis in the retention of apertures in the sutural positions and in the fact that it does not have them areally distributed. It differs from Globigerinoides bispherica in having more apertures in the suture separating the last chamber from the earlier chambers, and also in the greater degree to which the last chamber embraces the earlier part of the test.
Occurrence: This species ranges from the topmost part of the Globigerinatella insueta zone in the Brasso formation into the overlying Globorotalia fohsi barisanensis subzone in the Cipero and Brasso formations of Trinidad. In Venezuela, the species occurs in the middle part of the Siphogenerina transversa zone in the Pozon formation. It has also been observed in the Bissex Hill formation of Barbados.
Editors' Notes
Blow (1956) also described several sub-species including G. glomerosa glomerosa, so the figures are given in the sub-sepecies entries.
Blow, W. H. (1956). Origin and evolution of the foraminiferal genus Orbulina d'Orbigny. Micropaleontology. 2(1): 57-70. gsReferences:
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Globigerinoides glomerosa compiled by the pforams@mikrotax project team viewed: 16-1-2021
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