Blow 1959 pl16 f127.JPG
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Blow 1959 pl16 f127.JPGLinked specimens: USNM-625715 USNM-625716
Current identification/main database link: Globorotalia gigantea Blow, 1959
Original Description
Test trochospiral; spire opening fairly rapidly, with four to five chambers in the last whorl. Equatorial periphery lobate; axial periphery rounded to subacute, not keeled but often with much peripheral thickening; test generally biconvex; sutures of the spiral side depressed and strongly curved; sutures of the umbilical side slightly sinuous to radial; chambers almost hemispherical as seen from the spiral side; aperture interiomarginal, umbilical-extraumbilical, a low arch with a distinct lip; wall calcareous, perforate, often with distinct pustules in the umbilical sutural positions and over the umbilical surface of the earlier chambers
Size: maximum diameter of holotype 0.59 mm.
Extra details from original publication
Remarks: In general morphology this subspecies is similar to Globorotalia scitula scitula (Brady) but differs in being much larger. Two groups co-exist with mean diameters averaging 0.28 mm. and 0.54 mm. with few specimens greatly departing from the two means; the larger-sized group is assigned to this subspecies and shows the presence of much peripheral thickening and pustules on the umbilical side. The test is also generally more equally biconvex than in Globorotalia scitula scitula (Brady).
Occurrence: Ranges from the upper part of the Globorotalia fohsi fohsi Zone to the lower part of the Globorotalia menardii menardii/Globigerina nepenthes Zone, Pozon formation.
Blow, W. H. (1959). Age, correlation, and biostratigraphy of the upper Tocuyo (San Lorenzo) and Pozon Formations, eastern Falcon, Venezuela. Bulletins of American Paleontology. 39(178): 67-251. gsReferences:
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Globorotalia scitula gigantea compiled by the pforams@mikrotax project team viewed: 6-3-2021
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