 Hornibrook et al. 1989, Fig. 28.12a-c: 0.38 mm |
Reference: Hornibrook, Brazier & Strong 1989, p.131, Fig. 28:12a-c.
Synonymy: 1969, Bol. Geol. (Venezuela) 10(20): 271, 272, pl. 14, fig. 1-6;
1975, G. cibaoensis (in part), Kennett & Vella, Initial reports DSDP 29, p. 793, pl. 5, fig. 4-8;
1982, G. juanai, Hornibrook, N.Z. jl. geol. geophys. 25: 93, fig. 6aa-cc; 1983, Scott, Marine micropaleont. 7: 374, fig. 21-25;
1983, G. cibaoensis, Kennett & Srinivasan, Neogene Planktonic Foraminifera, p. 134-137, pl. 32, fig. 1-3, text-fig. 15;
1984, G.juanai, Hornibrook, Palaeogeogr., palaeoclimat., palaeoecol. 46(1-3): 109, fig. 1.
Description: A small Globorotalia, four chambers in last whorl, sutures recurved on spiral side, nearly radial on involute side which is strongly convex and rounded, with a small umbilicus; uncoiled side varies from gently convex to distinctly spiral, surface finely hispid and porous; margins moderately compressed, unkeeled; aperture a low, rimmed arch at base of last chamber.
Comparison: The holotype of G. cibaoensis has a more compressed margin with a distinct rim. G. juanai resembles G. scitula but is more inflated overall and New Zealand Upper Miocene populations coil predominantly sinistrally whereas G. scitula coils predominantly dextrally.
Distribution: Tongaporutuan to Kapitean.
Comment: Subsequent revision of DSDP Site 284 records Hornibrook (1982) indicate that the LAD of G. juanai is within the lower part of Core 14, that is, in the rangezone of G. sphericomiozea as shown by Hornibrook (1984).
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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