Catalog - Globigerina woodi Catalog - Globigerina woodi

CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina woodi Jenkins 1960

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 woodi
Other pages this level: << < G. umbrica, G. uruchaensis, G. utilisindex, G. varianta, G. velascoensis, 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 woodi

Citation: Globigerina woodi Jenkins 1960
taxonomic rank: Species
Type specimens: CPC4169
Type age (chronostrat): Globigerina woodi zone to the Globorotalia menardii miotumida zone. [Miocene]
Type locality: Lakes Entrance Oil Shaft, Victoria, Australia. Holotype:from 900 feet.
Type repository: Canberra, Australia; Bureau of Mineral Resources

Current identification/main database link: Globoturborotalita woodi Jenkins 1960


Original Description

Test a low trochospire, equatorial periphery trilobate to quadrilobate. Axial periphery rounded. Wall calcareous, perforate, usually coarsely pitted. Chambers 12-14 in number arranged in 2-3 whorls, spherical to ovate, appressed, with 3-4 chambers in the final whorl. Distinct radial sutures on both umbilical and spiral sides, depressed and tending to be U-shaped in the thicker walled tests. Umbilicus small. Aperture a medium-sized arch, interiomarginal, umbilical, with a clear, small fimbriate liplike margin around its border. Greatest diameter of holotype 0.45 mm.

Size:
Greatest diameter of holotype 0.45 mm.

Etymology:
This new species has been named after Professor Alan Wood, in recognition of his contributions to the study of foraminifera.

Extra details from original publication
Synonym: Globigerina cf. trilocularis d'Orbigny. - BOLLI, 1957, U. S. Nat. Mus., Bull. 215, p. 110, pl. 22, figs. 8a-9c.

Remarks: The size of the last chamber varies from much smaller to larger than the penultimate chamber. The position of the aperture varies from centrally placed to slightly extra-umbilical, depending on on the size and position of the last chamber. The size of the aperture also varies from a small low arch to a semicircular arch which resembles that of Globigerina apertura Cushman. Questioned specimens of the latter species occur sporadically in the upper part of the sequence. There are some species similar to Globigerinoides triloba (Reuss) immatura LeRoy, but they do not have any visible apertures. This species dominates the planktonic populations above 928 feet, its arched aperture, coarse wall, and compact form readily distinguishing it from the other species. It is ancestral to triloba Globigerinoides (Reuss).

Globigerina woodi has probably evolved from a variety of Globigerina praebulloides Blow, which tends to have only 3 chambers in the final whorl, and occurs abundantly in the bottom part of the shaft. These latter forms have a smoother test ornamentation and a low arched aperture. These are possibly Globigerina cf. trilocularis d'Orbigny of Bolli (1957b) from the Eocene Navet and San Fernando formations of Trinidad. 

References:

Jenkins, D. G. (1960). Planktonic foraminifera from the Lakes Entrance oil shaft, Victoria, Australia. Micropaleontology. 6: 345-371. gs

Spezzaferri, S., Olsson, R. K., Hemleben, C., Wade, B. S. & Coxall, H. K. (2018d). Taxonomy, biostratigraphy, and phylogeny of Oligocene and Lower Miocene Globoturborotalita. 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 8): 231-268. gs


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Globigerina woodi compiled by the pforams@mikrotax project team viewed: 26-5-2024

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