pforams@mikrotax - Orcadia


Classification: pf_cenozoic -> Hastigerinidae -> Orcadia
Sister taxa: Hastigerina, Hastigerinella ⟩⟨ Orcadia
Daughter taxa (time control age-window is: 0-800Ma)
Orcadia riedeli
Orcadia sp.
Specimens which cannot be assigned to established species


Citation: Orcadia Boltovskoy & Watanabe, 1982
Rank: genus
Type species: Hastigerinella riedeli

Catalog entries: Orcadia

Distinguishing features:
Parent taxon (Hastigerinidae): monolamellar, thick spines, thin shell
This taxon: Spine bases at chamber tips:

NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus.
They are being edited as the site is developed and comments on them are especially welcome.


Biogeography and Palaeobiology

Most likely ancestor: Hastigerina - at confidence level 1 (out of 5). Data source: Kennett & Srinivasan 1983 - based on tentative suggestion that O. riedeli evolved from H. pelagica .

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): near top of Gelasian Stage (85% up, 1.9Ma, in Gelasian stage). Data source: Total of range of species in this database

Plot of occurrence data:


Boltovskoy, E. & Watanabe, S. (1982). Orcadia, nuevo genero de Foraminiferos planctonicos Antarticos. Revista Española de Micropaleontología. 14: 5-11. gs


Orcadia compiled by the pforams@mikrotax project team viewed: 20-10-2021

Taxon Search:
Advanced Search

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

Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
Captcha Image
Powered by Commentics