 Hornibrook et al. 1989, Fig. 28.13a-c: 0.32 mm |
Reference: Hornibrook, Brazier & Strong 1989, p.136, Fig. 28:13a-c.
Synonymy: 1861, Aristospira pachyderma, K. Preuss. Akad. Wiss. Berlin, Monatsbr: 276-7, 303;
1881, Globigerina bulloides var. borealis, Brady, Ann. Mag. Nat. Hist. ser. 5, 8(48): 412;
1967, Globorotalia pachyderma, Jenkins, Micropaleontology 13(2): 195-203;
1971, Globorotalia (Turborotalia) pachyderma, Jenkins, N.Z. Geol. Surv. paleont. bull. 42: 128-9, pl. 12, figs. 345-7;
1973, Neogloboquadrina pachyderma, Collen and Vella, Jl. Foram. Res. 3(1): 18-19, pl. 1, figs. 11, 12;
1983, Globigerina pachyderma, Arikawa, Sci. Rep. Tohoku Univ. Sendai, 2nd Ser. (Geol.) 53(2): 103-157;
1973, Neogloboquadrina pachyderma, Kennett & Srinivasan, Neogene Planktonic Foraminifera, p. 192-4, Pl. 47, figs. 2, 6-8; Text fig. 21.
Description: Distinguished by the compact lobulate shape, with 4 chambers in the final whorl, often with a small final kummerform chamber partly covering the umbilicus. Aperture a low rimmed arch; surface often coarsely porous and cancellate.
Comparison: The most typical form occupies subpolar waters where it is predominantly left-coiling. Right coiling populations occur in transitional and cool subtropical waters, and they grade morphologically into N. deutertrei in warm subtropical waters. Some investigators regard the left and right coiling forms as different taxa. For an excellent summary of the distribution and taxonomy see Arikawa (1983).
Distribution: Tongaporutuan to Recent.
Comment: Alternations of right and left coiling populations in the Pliocene and Pleistocene have been used as evidence of climatic oscillations and were given the status of subzones of the Globorotalia infiata-zone by Jenkins (1967). Subsequent workers have not found them to be sufficiently well established, however, and they have not come into general use.
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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