nmn

Globuligerina


Classification: pf_mesozoic -> Conoglobigerinidae -> Globuligerina
Sister taxa: Conoglobigerina, Globuligerina,
Daughter taxa: (blue => in age window 0-800Ma)



The original description by Morozova and Moskalenko (1961) mentions a highly variable morphology regarding the number of chambers in the last whorl, height of test and shape of the trochospire. Typically the diameter of the test is about the same as the height, or the test is higher than wide. As seen from the apex (first chambers) upwards to the third and last whorl, the test may be slightly triangular in outline. Up to 5 chambers in the initial (often very small) whorls and 3 to 4 in the final (third whorl) which increases rapidly in width and height; chambers subglobular in shape with straight sutures; the intra-umbilical aperture is a low to medium high symmetrical arch.






Specimens which cannot be assigned to established species

Taxonomy

Citation: Globuligerina Bignot and Guyader 1971
Rank: Genus
Basionym: Globigerina oxfordiana
Type species: Globigerina oxfordiana Grigelis, 1958

Type images:

Original description: Globuligerina Bignot and Guyader 1971:

Entries in the Catalog of original descriptions: Globuligerina;

Distinguishing features: Wall smooth or pustulose but without reticulate pattern


Test morphology: Test trochospiral, low to medium to high spired (H/D ratio varies between 0.5 and 1.5). Mostly 4 and rarely 3–4 or only 3 chambers in the last whorl. Chamber shape globular or somewhat flattened, or may be oblong, elongated in a radial sense. Chambers rarely show an equatorial imperforate band. Apertural shape variable; often a medium to high arch; the arch may be an asymmetrical arch or comma shaped; aperture rarely a slit; aperture position mostly umbilical, but may be slightly extraumbilical. The aperture has a thickened and imperforate rim (lip) that may circle the aperture (as observed in well-preserved G. oxfordiana). Wall microperforate, smooth to pustulose; pustules may be pointed (pseudomuricae), or blunt; pustules may have pore mounds; pustules may fuse to form ridges.

Geological Range:
Last occurrence (top): within Tithonian Stage (145.01-152.06Ma, top in Tithonian stage). Data source: Total of range of species in this database
First occurrence (base): within Bathonian Stage (166.07-168.28Ma, base in Bathonian stage). Data source: Total of range of species in this database

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

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Spiroconvexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Low-moderateperiphery:N/Aaperture border:
umb chbr shape:Globularumbilicus:periph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:wall texture:Finely pustuloseshell porosity:Microperforate: <1µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:0.0-0.0

References:

Bignot, G. & Guyader, J., (1971). Observations nouvelles sur Globigerina oxfordiana Grigelis. In: Farinacci, A. (Editor), Proceedings of the Second Planktonic Conference, Roma 1970. Edizione Tecnoscienza, Roma, pp. 79-81. GS

Grigelis, A.A., (1958). Globigerina oxfordiana sp. n. – an occurrence of Globigerina in the Upper Jurassic deposits of Lithuania. Nauchnyye Doklady Vysshey Shkoly, Geol-Geogr Nauki, 1958(3): 109-111. GS

Loeblich, A.R. & Tappan, H. (Editors), (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York, 1059 pp. GS


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Globuligerina compiled by the pforams@mikrotax project team viewed: 24-3-2019

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Short stable page link: http://mikrotax.org/pforams/index.php?id=110199 Go to Archive.is to create a permanent copy of this page - citation notes



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