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Globorotalia semivera Hornibrook 1961 from: Jenkins, D.G. (1985): Southern mid-latitude Paleocene to Holocene planktic foraminifera. In: Plankton stratigraphy Eds: Bolli, H.M.Saunders, J.B.Perch-Nielsen, K. p. 263-282
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Species Globorotalia semivera Hornibrook 1961


Alternative name:
Discussion / Comments:
Jenkins (1985):
G. semivera with 5 chambers in the final whorl and a fairly large aperture probably evolved from the 4 chambered G. pseudocontinuosa in the Late Oligocene Globigerina euapertura Zone of New Zealand, and became extinct in the Middle Miocene (Jenkins, 1971). On sites drilled on Leg 29 south of New Zealand, G. semivera has a range of Early Miocene in Site 279, Late Oligocene Early Miocene in Site 282 (Jenkins, 1975) and in the Southeastern Atlantic Leg 40 Site 360 it ranges from Late Oligocene to Early Miocene (Jenkins, 1975). The relationship of G. semivera to the warmer water G. mayeri of Bolli & Saunders (1982) is not understood, but G. semivera has also been identified in the Early Miocene of France and the English Channel (Jenkins, 1966c, 1977).
Synonym list:
Jenkins (1985):
1961 Globigerina semivera Hornibrook. - Hornibrook : p.149 pl. 23, figs. 455-457
1985 Globorotalia semivera Hornibrook. - Jenkins : p.149 pl. 23, figs. 455-457
Was used in synonym list of:
Stratigraphy - absolute ages:
LAD: 17.3 ± 0 [Ma], Berggren et al. (1995)
References:

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

Jenkins,D.G. (1985):
Southern mid-latitude Paleocene to Holocene planktic foraminifera.
In: Plankton stratigraphy Eds: Bolli, H.M.Saunders, J.B.Perch-Nielsen, K. p. 263-282

Berggren,W.A.; Kent,D.V.; Swisher,C.C. and Aubry,M.P. (1995):
A revised Cenozoic Geochronology and Chronostratigraphy.
In: Geochronology Time Scales and Global Stratigraphic Correlation, SEPM Special Publication Vol. 54
Anonymous: Unedited TaxonConcept data
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