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Globorotalia (Fohsella) birnageae Blow 1959 from: Kennett, J.Srinivasan, M.S. (1983): Neogene Planktonic Foraminifera - A Phylogenetic Atlas.
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Species Globorotalia (Fohsella) birnageae Blow 1959


Alternative name:
Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test small, low trochospiral, equatorial profile almost circular; chambers ovate, slightly elongated tangentially as viewed from the spiral side, six in the final whorl; last chamber often smaller than the penultimate; sutures on spiral side curved, slightly depressed, on umbilical side radial, depressed; surface finely and uniformly perforate. Umbilicus small, often completely closed, aperture interiomarginal, extraumbilical-umbilical, slitlike with a prominent lip.
Discussion / Comments:
Kennett & Srinivasan (1983):
Gr. (F.) birnageae differs from Gr. (F.) kugleri in having sutures that are less depressed, about one or two fewer chambers in the final whorl, a closed umbilicus, and a slitlike aperture with a distinct lip. This species differs from Gr. (F.) peripheroronda in having a more circular outline and a lower convex umbilical side. Close morphological and surface ultrastructural relationships exist between Gr. (F.) peripheroronda and Gr. (F.) birnageae. Gr. (F.) birnageae has not been recorded below Zone N7. Its ancestor seems to be Gr. (F.) peripheroronda.
Synonym list:
Kennett & Srinivasan (1983):
1959 Globorotalia birnageae Blow. - Blow : p.210 pl 17 figs 108 a-c
Was used in synonym list of:
References:

Blow,W.H. (1959):
Age, correlation and biostratigraphy of the upper Tocuyo (San Lorenzo) and Pozón Formations, eastern Falcon, Venezuela . Bull. Am. Paleontol. Vol. 39(178) p. 67-252

Kennett,J. and Srinivasan,M.S. (1983):
Neogene Planktonic Foraminifera - A Phylogenetic Atlas.

Anonymous: Unedited TaxonConcept data
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