 Hornibrook et al. 1989, Fig. 20.11a-b: 0.54 mm |
Reference: Hornibrook, Brazier & Strong 1989, p.93, Fig. 20:11a-b.
Synonymy: 1939, Trans. Roy. Soc. N.Z. 69(3): 323, pl. 28, fig. 138-140;
1961, Hornibrook, N.Z. Geol. Surv. paleont. bull. 34(1): 113, pl. 16, fig. 339, 344.
Description: Smooth and flat dorsally, conical ventrally, large apertural plates projecting into a deep umbilicus, smaller and more planoconical than G. allani and more tightly coiled with about eight chambers in the final whorl.
Distribution: Whaingaroan to Nukumaruan.
Comment: In the Arnold Series, an earlier form of this lineage, distinguished by a tendency for the whorls on the dorsal side to be more spirally coiled, with more distinctly excavated chambers, was separated by Finlay, as Gyroidina scrobiculata. Also G. subzelandicus Hornibrook (1961) (Waitakian to Waiauan).
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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