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Globigerinoides immaturus Le Roy 1939 from: Kennett, J.Srinivasan, M.S. (1983): Neogene Planktonic Foraminifera - A Phylogenetic Atlas.
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Species Globigerinoides immaturus Le Roy 1939


Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test low trochospiral, chambers spherical, three in the final whorl increasing moderately in size as added; sutures on both sides radial to gently curved, deeply depressed; surface distinctly cancellate; umbilicus narrow; primary aperture interiomarginal, umbilical with a low to medium arch; last few chambers show single supplementary sutural apertures opposite to the primary aperture.
Discussion / Comments:
Kennett & Srinivasan (1983):
Gs. immaturus is closely related to both Gs. triloba and Gs. sacculifer, and populations show complete gradations. Gs. immaturus differs from Gs. triloba in exhibiting a much less dominant final chamber and from Gs. sacculifer by the absence of a terminal, elongate, sacklike chamber.
Synonym list:
Kennett & Srinivasan (1983):
1939 Globigerinoides sacculiferus var. immatura Le Roy. - Le Roy : p.263 pl 3 figs 19-21
References:

Le Roy,L.W. (1939):
Some small foraminifers, ostracoda and otoliths from the Neogene ("Miocene") of the Rokan-Tapanoeli area, Central Sumatra. . Natuurk. Tijdschr. Nederl. Indie Vol. 99

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

Anonymous: Unedited TaxonConcept data
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