 Hornibrook et al. 1989, Fig. 41.3a-d (Topotypes, Waitemata Group, Orakei Bay, Otaian): 3.0 mm |
Reference: Hornibrook, Brazier & Strong 1989, p.163, Fig. 41:3a-d (Topotypes, Waitemata Group, Orakei Bay, Otaian).
Synonymy: 1964, Orbitoides orakeiensis, Novara-Exped. Geol. 1(2): 86, pl. 16, fig. 21;
1971, L. (N.) orakeiensis, Hornibrook, N.Z. Geol. Surv. paleontol. bull. 43: 24, 25, text fig. 6a, b, pl. 12, fig. 1-5, pl. 13, fig. 1.
Description: Test discoidal, lacking arms, lenticular in side view with a raised median pustulose area, merging laterally with a thin flange. Megalospheric form with secondary embryonic chamber (deuteroconch) about twice the size of first (protoconch) and embracing about half its circumference; equatorial chambers spathulate to ogival; narrow pillars visible in vertical section.
Distribution: Waitakian to Waiauan.
Comment: Divided into three subspecies: N. o. orakeiensis (Waitakian to Altonian); N. o. hornibrooki Matsumaru (Stillwater Mudstone; upper Altonian to Clifdenian); N. o. waikukuensis Chaproniere, (Waiauan). See Matsumaru (1971); Chaproniere (1984a, b). Also Lepidocyclina (Eulepidina) ephippoides Jones & Chapman, 1900; L. (E.) dilatata dilatata (Mitchelotti, 1861). Distinguished by the total envelopment of the protoconch by the deuteroconch, compared to its partial enclosure in Nephrolepidina. Otaian (Puketi Formation, Northland; Ihungia Formation, Whakoau Stream, Poverty Bay), Matsumaru 1971, Chaproniere 1984a, b.
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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