pforams@mikrotax - Guembelitria pforams@mikrotax - Guembelitria


Classification: pf_mesozoic -> Guembelitriidae -> Guembelitria
Sister taxa: Guembelitria
Daughter taxa (time control age-window is: 0-800Ma)
Guembelitria cenomana

Guembelitria cretacea

Guembelitria sergipensis

Guembelitria sp.
Specimens which cannot be assigned to established species


Citation: Guembelitria Cushman 1933
taxonomic rank: Genus
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:
Parent taxon (Guembelitriidae): Early stage trochospiral, triserial, or biserial, later may show serial reduction or proliferation.
This taxon: 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): at top of P1b subzone (100% up, 63.9Ma, in Danian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within P. cheniourensis zone (118.02-118.93Ma, base in Aptian stage). Data source: Total of ranges of species in this database

Plot of range and occurrence data:


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

Missing or ambiguous references: Cushman 1933 32-38;


Guembelitria compiled by the pforams@mikrotax project team viewed: 15-6-2024

Taxon Search:
Advanced Search

Short stable page link: Go to to create a permanent copy of this page - citation notes

Add Comment

* Required information
Captcha Image
Powered by Commentics

Comments (3)

Dr. K. Whiso(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!

Jeremy Young(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

Dr. K. Whiso(India)

Dear Jeremy Young,

Thank you for the clarification! It is very helpful.

K. Whiso