CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia zealandica incognita Walters 1965

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> G -> Globorotalia -> Globorotalia zealandica incognita
Other pages this level: << < G. trinidadensis, G. troelseni, G. truncatulinoides excelsa, G. uncinata, G. uncinata carinata, G. ungulata, G. velascoensis parva, G. wartsteinensis, G. whitei, G. wilcoxensis, G. wilcoxensis acuta, G. wilesi, G. woodi, G. youngi, G. zealandica, G. zealandica incognita, G. zealandica pseudomiozea,

Globorotalia zealandica incognita

Citation: Globorotalia zealandica incognita Walters 1965
Rank: sub-species
Type locality: an unnamed right-bank tributary of the Waiomoko River, Sheet N98/2, grid ref. 545563, approximately 13 miles north-east of Gisborne, N.Z.
Type age: Awamoan
Type sample and level: sample GRW 147,
Holotype Repository: Lower Hutt; N.Z Geological Survey foraminiferal collections
Type & figured specimens: HOLOTYPE: Fig. 6 A-C Register No. TF 1487.

Current identification/main database link: Paragloborotalia incognita (Walters 1965)


Original Description
Test a low trochospire consisting of 2½-3 whorls of fairly rapidly enlarging chambers, with 4-4½ (usually 4) in the last whorl; equatorial profile suboval, equatorial periphery lobate; axial profile narrowly suboval, axial periphery evenly rounded, not thickened; dorsal surface of test gently convex, ventral side more strongly convex; wall fairly thick, coarsely punctate, not secondarily thickened; dorsally, chambers a little longer than broad, weakly inflated, separated by gently curved, subradial, slightly depressed sutures; chambers triangular in outline on the ventral side, moderately inflated, separated by gently curved, slightly depressed sutures; umbilicus closed; aperture a fairly low arch extending from the umbilicus most of the way to the periphery, bordered by a thickish lip; septal foramen highly arched, bordered by a narrow thickened rim; a small, finely punctate terminal chamberlet possessing a slit-like aperture is sometimes developed.

Size: Maximum diameter = 0.36 mm; height = 0.23 mm.

Extra details from original publication
Remarks: This subspecies is distinguished from G. zealandica pseudomiozea (into which it later evolves) by its smaller size, more rapidly enlarging chambers, much less inflated ventral side, more lobate equatorial periphery, more coarsely punctate wall, and its unthickened periphery and ventral surface. At the top of its range, all gradations occur between this subspecies and G. zealandica pseudomiozea, over a short stratigraphic interval.
It differs from G. opima continuosa Blow in that its chambers increase more rapidly in size, are more compressed and not so subglobular, and in that the aperture is a higher arch, extending further up into the apertural face.
 
Stratigraphic range: From at least as low as near the base of the Otaian-Hutchinsonian up to the lower two-thirds of the Awamoan Stage.

References:

Leckie, R. M. et al. (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene and Lower Miocene Paragloborotalia and Parasubbotina. In, Wade, B. S. , Olsson, R. K. , Pearson, P. N. , Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 46(Chap 5): 125-178. gs V O

Walters, R. (1965). The Globorotalia zealandica and G. miozea lineages. New Zealand Journal of Geology and Geophysics. 8: 109-127. gs


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Globorotalia zealandica incognita compiled by the pforams@mikrotax project team viewed: 21-9-2020

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