Catalog - Globigerina zealandica Catalog - Globigerina zealandica

CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina zealandica Hornibrook 1961

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 -> Globigerina -> Globigerina zealandica
Other pages this level: << < G. velascoensis compressa, G. venezuelana, G. vignalii, G. voluta, G. wagneri, G. washitensis, G. weissi, G. wilsoni, G. wilsoni bolivariana, G. winkleri, G. woodi, G. woodi connecta, G. woodi extrema, G. yeguaensis, G. yeguaensis pseudovenezuelana, G. zealandica, G. neoparawoodi

Globigerina zealandica

Citation: Globigerina zealandica Hornibrook 1961
taxonomic rank: species
Type sample (& lithostrat): Rifle Butts Formation
Type age (chronostrat): Lower Miocene, Awamoan
Type locality: an exposed coastal terrace at Old Rifle Butts, N.Z.M.S. 1, Sheet S136 (Provisional Edition 1943), Grid. Rei. 539629; Oamaru District of South Island, New Zeal and
Type repository: Lower Hutt; New Zealand Geological Survey

Current identification:


Original Description

Test medium sized, consisting of a short spire of up to three whorls of spherical chambers rapidly increasing in diameter, four in the final whorl. The chambers overlap relatively little and are widely separated, giving the effect of being slightly staggered. The final chamber in a minority of adults is a little smaller than the penultimate one. The surfaces of the test are very finely porous and densely and finely spinose and do not have the reticulate ornamentation characteristic of most Globigerinas. The aperture, which opens into the umuilicus. is very small and is hemmed in by the surrounding chambers to such an extent that it is difficult to see how it could have functioned effectively. In many samples numerous specimens have the aperture obscured by strong flattened spines growing out from the bases of the surrounding chambers.

Size:
Dimensions of holotype, greatest diameter 0.41mm.

Extra details from original publication
Variability. -The development of spines is somewhat irregular, some specimens having patches of coarse spines. The coiling ratios in the type sample are: twenty-four anticlockwise to eighteen clockwise.

Remarks. - Distinguished by the widely separated, globular, finely to coarsely spinose chambers and by the small umbilical aperture.

References:

Hornibrook, N. d. B. (1961). Tertiary Foraminifera from Oamaru District (N.Z.). Part 1 Systematics and distribution. New Zealand Geological Survey, Paleontological Bulletin. 34(1): 1-192. gs


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Globigerina zealandica compiled by the pforams@mikrotax project team viewed: 23-4-2024

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