pforams@mikrotax - Guembelitria

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Guembelitria

Classification: pf_mesozoic -> Guembelitriidae -> Guembelitria
Sister taxa: Guembelitria,

Daughter taxa: (blue => in age window 0-800Ma)
			Guembelitria cenomana
			Guembelitria cretacea
			Guembelitria sergipensis
			Guembelitria sp. Specimens which cannot be assigned to established species

Taxonomy

Citation: Guembelitria Cushman 1933

Rank: Genus

Basionym: Guembelitria cretacea

Type species: Guembelitria cretacea Cushman, 1933

Original description: Test similar to Guembelina, but triserial; wall calcareous, finely perforate; aperture large, at the inner edge of the last-formed chamber. This genus is widely distributed in the Upper Cretaceous of North and South America.

Entries in the Catalog of original descriptions: Guembelitria

Distinguishing features: Test subconical, chambers globular and inflated, triserial throughout, sutures distinct, depressed; wall calcareous, optically radial, finely and irregularly perforate, with each pore elevated on a pore mound; aperture an interiomarginal arch at the base of the final chamber, with an imperforate bordering lip.

Diagnostic characters: Test subconical, chambers globular and inflated, triserial throughout, sutures distinct, depressed; wall calcareous, optically radial, finely and irregularly perforate, with each pore elevated on a pore mound; aperture an interiomarginal arch at the base of the final chamber, with an imperforate bordering lip.

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): within Aptian Stage (112.95-126.30Ma, base in Aptian 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

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
Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Guembelitriidae

References:

Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gs

Guembelitria compiled by the pforams@mikrotax project team viewed: 31-3-2020

Taxon Search:

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Short stable page link: http://mikrotax.org/pforams/index.php?id=110218 Go to Archive.is to create a permanent copy of this page - citation notes

Comments (1)

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Dr. K. Whiso (Dehradun, India)

The precise and organised information made avaiable in micrtax is very useful and important for all foraminiferologists. Appreciate the great effort of the Team. Was just wondering where Guembelitria harrisi fits in? Or, is G. harrisi no more in 'use' as workers like Kroon and Nederbragt, (1990), considered G. harissi as a junior synonym of Guembelitria cenomana? Any more information on this would be appreciated!

18th February 2020 11:16am

Jeremy Young (Tonbridge, UK)

Dear Dr. Whiso.

Thank you for the kind comments and it is very good to know you find the system useful. G. harrisi is indeed regarded here as a junior synonym of G. cenomana. For cases like this where a species does not appear where you expect it t the best thing to do is to use the search box to look for the species - this should usually allow you to find it.

Jeremy Young

24th February 2020 10:24pm

Dr. K. Whiso (Dehradun, India)

Dear Jeremy Young,

Thank you for the clarification! It is very helpful.

K. Whiso

27th February 2020 5:27am

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