 Hornibrook et al. 1989, Fig. 27.2 (Holotype): 0.41 mm |
Reference: Hornibrook, Brazier & Strong 1989, p.132, Fig. 27:2 (Holotype).
Synonymy: 1961, Globigerina semivera, N.Z. Geol. Surv. paleont. bull. 34(1): 149-150, pl. 23, fig. 455-457;
1971, G. (Turborotalia) nana semivera Jenkins, Ibid. 42: 125, 127, pl. 12, fig. 342-344;
1983, Globorotalia (Jenkinsella) semivera, Kennett & Srinivasan, Neogene Planktonic Foraminifera, p. 172, pl. 42, fig. 3-5, text-fig. 19;
1984, G. mayeri semivera, Hoskins, Palaeogeogr., palaeoclimat., palaeoecol. 46(1-3): 203-216, fig. 7, no. 1-6.
Description: One of several similar taxa which occur fairly consistently in the Oligocene and Miocene. G. semivera has four to five chambers in the final whorl.
Comparison: Individuals of this group with four chambers were separated by Jenkins as G. nana pseudocontinuosa which typically has a highly arched aperture. Hoskins groups these taxa as variants and synonyms of G. mayeri (see under G. mayeri).
Distribution: Whaingaroan to Clifdenian (Jenkins).
Comment: Kennett & Srinivasan derive G. semivera from G. opima and give its range as Zone P21 (Late Oligocene) to N8 (Early Miocene).
Cite this publication as: "Strong CP, Raine JI, Terezow M. 2018. Key
species of New Zealand fossil foraminifera: descriptions from "Manual of New
Zealand Permian to Pleistocene Foraminiferal Biostratigraphy" by Hornibrook,
Brazier and Strong, 1989. Lower Hutt (NZ): GNS Science. (GNS Science
miscellaneous series; 123)."
ISSN 1172-2886, ISBN 978-1-98-853088-8,
DOI 10.21420/G2M63W.
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