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Globorotalia (Jenkinsella) semivera Hornibrook 1961 from: Kennett, J.Srinivasan, M.S. (1983): Neogene Planktonic Foraminifera - A Phylogenetic Atlas.
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Species Globorotalia (Jenkinsella) semivera Hornibrook 1961


Alternative name:
Diagnosis / Definition:
Kennett & Srinivasan (1983):
Test medium size, low trochospiral, equatorial periphery lobulate, axial periphery rounded, chambers spherical, five in the final whorl, increasing uniformly in size; sutures on both spiral and umbilical sides slightly curved to radial, depressed; surface cancellate with circular pores and polygonal ridges; umbilicus small, open; aperture a low arch bordered by a rim interiomarginal, umbilical-extraumbilical.
Discussion / Comments:
Kennett & Srinivasan (1983):
Gr. (J.) semivera is an intermediate form linking Gr. (J.) opima and Gr. (J.) siakensis. It is distinguished from Gr. (J.) opima by possessing five chambers in the final whorl and in having a higher-arched, rimmed aperture. Gr. (J.) siakensis usually has more than five chambers in the final whorl.
Synonym list:
Kennett & Srinivasan (1983):
1961 Globigerina semivera Hornibrook. - Hornibrook : p.149 pl 23 figs 455-457
Was used in synonym list of:
References:

Hornibrook,N. (1961):
Tertiary foraminifers from Oamaru District (N.Z.), Part 1.Systematics and distribution . New Zealand Geological Survey Paleontological Bulletin Vol. 34

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

Anonymous: Unedited TaxonConcept data
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