CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia conica Jenkins 1960
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Citation: Globorotalia conica Jenkins 1960Taxonomic rank: speciesType age (chronostrat): Candorbulina glomerosa curva zone to the Globorotalia mayeri zone.Type locality: Lakes Entrance Oil Shaft, Victoria, Australia. Holotype: from 576 feet.Type repository: Milan; Micropalaeontological Collection, Universita degli Studi di Milano, Dipartimento di Scienze della Terra, Italy.
Current identification:
Original Description Test umbilico-convex in shape, slightly longer than broad, equatorial periphery ovate, slightly lobate. Axial periphery subangular, rounded. Wall calcareous, finely perforate, smooth, except for minute pustules in front of the aperture on the umbilical surface of the first chamber of the final whorl. Chambers 13-16, proloculus diameter 0.02 mm., 5 angular-conical chambers in the last whorl. Spiral sutures stongly recurved, slightly depressed; umbilical sutures curved, slightly depressed.Umbilicus narrow, tending to be closed. Aperture a low arch with a slight lip, interiomarginal, extraumbilical-umbilical. Size: Largest diameter of holotype 0.38 mm Extra details from original publication This species is quite common in the samples and it is distinguished from Globorotalia scitula praescitula Blow by its conical shape. It differs from Globorotalia menardii d'Orbigny miocenica Palmer by not possessing a peripheral keel, and from Globorotalia zealandica Hornibrook by having a smoother wall, and more strongly recurved sutures on the spiral side, possessing the pustules in front of the aperture, and having 5 chambers in the final whorl. Editors' Notes NB This is a problematic taxon, it will be investigated by the Neogene working group. [editor's comment - JRY 2019]
References:
Jenkins, D. G. (1960). Planktonic foraminifera from the Lakes Entrance oil shaft, Victoria, Australia. Micropaleontology. 6: 345-371. gs
Globorotalia conica compiled by the pforams@mikrotax project teamviewed: 16-11-2025
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Jenkins 1960 04-3a-c.jpg
Jenkins 1960 04-3a-c.jpg
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