pforams@mikrotax - Globuligerina oxfordiana calloviensis

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Globuligerina oxfordiana calloviensis

Classification: pf_mesozoic -> Conoglobigerinidae -> Globuligerina -> Globuligerina oxfordiana -> Globuligerina oxfordiana calloviensis
Sister taxa: G. oxfordiana calloviensis, G. oxfordiana subsp. oxfordiana

Gradstein 2017 f8 14-16.JPG
Gradstein 2017 f8 11-13.JPG

Taxonomy

Citation: Globuligerina oxfordiana subsp. calloviensis Kuznetsova, in Kuznetsova & Uspenskaya 1980

Rank: sub-species

Basionym: Globuligerina calloviensis

Taxonomic discussion: Reclassified as a sub-species of G. oxfordiana by Gradstein (2017), in accordance with a suggestion of Simmons et al. 1997

Type images:

holotype: G. calloviensis
x: G. calloviensis
x: G. calloviensis

Original description: Translated from Russian: Test small, low trochospiral, subquadratic in contour, convexo-concave in edge view. Spiral side is low convex. Umbilical side is slightly concave. Two whorls with 4 chambers in each one. Chambers very compact in an inner whorl, and become less tightly packed in the last whorl. Periphery rounded and widely-scalloped. Sutures slightly curved, just a little depressed. Aperture umbilical, arched, with thin lip. Umbilicus wide. Test calcareous, porous; pores oval, 0.4 - 1.5 microns in size, 25-35 pores in 100 square microns area. Surface covered with pustules and cells. Cells separated by pustules and ridges, and irregular in shape.

Entries in the Catalog of original descriptions: Globuligerina calloviensis

Geological Range:
Last occurrence (top): within Early Kimmeridgian Substage (154.73-157.25Ma, top in Kimmeridgian stage). Data source: Gradstein et al. 2017
First occurrence (base): within Callovian Stage (163.47-166.07Ma, base in Callovian stage). Data source: Gradstein et al. 2017

Plot of range and occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Globuligerina oxfordiana

Character matrix

test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Concavo-convex	aperture:	Umbilical
sp chamber shape:	Globular	coiling axis:	Moderate	periphery:	N/A	aperture border:	N/A
umb chbr shape:	Globular	umbilicus:	Wide	periph margin shape:	Broadly rounded	accessory apertures:	N/A
spiral sutures:	Strongly depressed	umb depth:	Shallow	wall texture:	Smooth	shell porosity:	Microperforate: <1µm
umbilical or test sutures:	Strongly depressed	final-whorl chambers:	4.0-4.0	N.B. These characters are used for advanced search. N/A - not applicable

References:

Gradstein, F. M. (2017a). New and emended species of Jurassic planktonic foraminifera. Swiss Journal of Palaeontology. 136(2): 161-185. gs V O

Kuznetsova, K. I. & Uspenskaya, E. A. (1980). Novie nakhodki planktonnikh foraminifer v verkhneyurskikh otlozhenii Krima [New finds of planktonic Foraminifera in the Upper Jurassic deposits of the Crimea]. Doklady Akademii Nauk SSSR. 254(3): 748-752. gs

Globuligerina oxfordiana calloviensis compiled by the pforams@mikrotax project team viewed: 22-1-2021

Taxon Search:

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Short stable page link: http://mikrotax.org/pforams/index.php?id=110202 Go to Archive.is to create a permanent copy of this page - citation notes

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