Sub-taxa & variants (time control age-window is: 0-800Ma)![]() | ||||
![]() | Globuligerina oxfordiana calloviensis | |||
![]() | Globuligerina oxfordiana subsp. oxfordiana |
Taxonomy
Original description: Test trochoid, small, oval in outline, with a lobate contour. On the dorsal side two whorls of the spire are visible, with four chambers in each that adjoin but do not overlap one another. First, early whorl on the dorsal side rises somewhat above the second, later one. Chambers increase gradually in size as added. Sutures linear, straight, deep. On the ventral side the chambers of the last whorl are visible. In the center here is a small umbilicus. Aperture a semilunate opening at the umbilical margin of the last chamber, furnished with a small lip. Wall perforate, rough, calcareous.
Entries in the Catalog of original descriptions: Globigerina oxfordiana
Character matrix
test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Spiroconvex | aperture: | Umbilical |
sp chamber shape: | Globular | coiling axis: | Low-moderate | periphery: | N/A | aperture border: | N/A |
umb chbr shape: | Globular | umbilicus: | Narrow | periph margin shape: | Broadly rounded | accessory apertures: | None |
spiral sutures: | Strongly depressed | umb depth: | Shallow | wall texture: | Finely muricate | shell porosity: | Finely Perforate: 1-2.5µm |
umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 4-4 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): within Early Tithonian Substage (147.72-152.06Ma, top in Tithonian stage). Data source: Gradstein et al. 2017
First occurrence (base): within Bajocian Stage (168.28-170.3Ma, base in Bajocian stage). Data source: Gradstein et al. 2017
Plot of range and occurrence data:
Gradstein, F. & Waskowska, A. (2021). New insights into the taxonomy and evolution of Jurassic planktonic foraminifera. Swiss Journal of Palaeontology. 140(1): 1-12. gs O Grigelis, A. A. (1958). Globigerina oxfordiana sp. n. – an occurrence of Globigerina in the Upper Jurassic deposits of Lithuania. Nauchnyye Doklady Vysshey Shkoly, Geologo-Geograficheskei Nauki. 1958(3): 109-111. gs Kendall, S., Gradstein, F., Jones, C., Lord, O. T. & Schmidt, D. N. (2020). Ontogenetic disparity in early planktic foraminifers. Journal of Micropalaeontology. 39: 27-39. gs OReferences:
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Globuligerina oxfordiana compiled by the pforams@mikrotax project team viewed: 8-12-2023
Short stable page link: https://mikrotax.org/pforams/index.php?id=110203 Go to Archive.is to create a permanent copy of this page - citation notes |
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