Daughter taxa (time control age-window is: 0-800Ma)![]() | ||||
| Corannulus germanicus Ring-shaped, broadly elliptical, non-birefringent holococcolith with multiple (~7-11) thorn-like projections around the outer edge. Morphology clearest in phase constrast illumination where outer rim shows high relief. | ||||
| Corannulus horridulus Small to medium sized elliptical coccolith with a broad rim and narrow vacant central area. The rim is thick and ragged in overall appearance. | ||||
| Corannulus tauricus | ||||
| Corannulus sp. Specimens which cannot be assigned to any established species | ||||
Distinguishing features:
Parent taxon (fossil holococcoliths): Holococcolith genera only known from the fossil record
This taxon: Discoidal holococcoliths with large central openings and marginal perforations or indentations; non-birefringent in plan view.
Farinacci & Howe catalog pages:
Corannulus * , Diademopetra * , Guttilithion *
| LITHS: holococcolith, asymmetric, CA: vacant, CROSS-POLARS: 1ou, V-prominent, |
| Lith size: 4->10µm; |
Geological Range:
Last occurrence (top): at top of NP21 zone (100% up, 32.9Ma, in Rupelian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NP10 zone (54.17-55.86Ma, base in Ypresian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Hay, W. W., Mohler, H. P. & Wade, M. E. (1966). Calcareous nannofossils from Nal'chik (northwest Caucasus). Eclogae Geologicae Helvetiae. 59: 379-399. gs O Stradner, H. (1962). Über neue und wenig bekannte Nannofossilien aus Kreide und Alttertiär. Verhandlungen der Geologischen Bundesanstalt (Wien). 2: 363-377. gs References:

![]()
![]() |
Corannulus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-5-2026
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=345 Go to Archive.is to create a permanent copy of this page - citation notes |
This policy contains information about your privacy. By posting, you are declaring that you understand this policy:
This policy is subject to change at any time and without notice.
These terms and conditions contain rules about posting comments. By submitting a comment, you are declaring that you agree with these rules:
Failure to comply with these rules may result in being banned from submitting further comments.
These terms and conditions are subject to change at any time and without notice.
Comments (2)
Hello Jeremy,
published a joint article on the Eocene of the Crimea with a new species - Corannulus tauricum Musatov, n. sp. (nannofossil) - Vasilyeva Olga N., Musatov Vladimir A. Dinoflagellate cyst and nannoplankton assemblages from the Middle Eocene Kuma Formation of Crimean Peninsula — biostratigraphy and palynofacies // Palaeoworld, September 2023, Volume 32, Issue 3, Pages 523-546, https://doi.org/10.1016/j.palwor.2022.11.006
Sincerely, Vladimir
Hi Vladimir
Thanks, yes I should get that species in the system. Since Palaeoworld is a commercial (Elsevier) journal could you send me a copy of the plate from your files. Ideally a higher resolution version than the one published, but in any case one direct from you rather than from the PDF.
cheers
Jeremy