pforams@mikrotax - Globuligerina oxfordiana calloviensis

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Globuligerina oxfordiana calloviensis

Classification: pf_mesozoic -> Conoglobigerinidae -> Globuligerina -> Globuligerina oxfordiana calloviensis
Sister taxa: G. avariformis, G. balakhmatovae, G. bathoniana, G. dagestanica, G. jurassica, G. oxfordiana, G. oxfordiana calloviensis, G. tojeiraensis, G. sp.,

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: Globuligerina calloviensis
x: Globuligerina calloviensis
x: Globuligerina 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 occurrence data:

Dec 2017 - Plotting of Neptune data has been re-enabled on the Mesozoic pages following revision of the age-models in Neptune. The data is, however, still very sparse for the Early Cretaceous

(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Globuligerina

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

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: 20-8-2019

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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