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


Alternative name:
Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test large, low trochospiral, equatorial periphery lobulate; axial periphery broadly rounded; chambers subspherical, inflated, six to seven in the final whorl, increasing slowly in size as added; sutures on umbilical and spiral sides nearly radial, depressed; surface coarsely perforate with polygonal ridges and large pores; umbilicus wide, deep; aperture interiomarginal, extraumbilical-umbilical, a low elongated arch, bordered by a distinct rim.
Discussion / Comments:
Kennett & Srinivasan (1983):
Gr. (J.) siakensis is distinguished from Gr. (J.) mayeri Cushman and Ellisor by its nearly radial spiral and umbilical sutures, wide open and deep umbilicus, and by usually possessing more than five chambers in the final whorl.
Synonym list:
Kennett & Srinivasan (1983):
1939 Globorotalia siakensis Le Roy. - Le Roy : p.262 pl 4 figs 20-22
Was used in synonym list of:
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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