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 sp. Specimens which cannot be assigned to any established species |
Taxonomy:
Distinguishing features: Discoidal holococcoliths with large central openings and marginal perforations or indentations; non-birefringent in plan view.
Farinacci & Howe catalog pages: Corannulus * , Diademopetra * , Guttilithion *
Search data:Tags | LITHS: holococcolith, asymmetric, CA: vacant, CROSS-POLARS: 1ou, V-prominent, |
Metrics | Lith size: 4->10µm; |
Geological Range:
Last occurrence (top): in lower part of Rupelian Stage (17% up, 32.9Ma, in Rupelian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Ypresian Stage (0% up, 56Ma, in Ypresian stage). Data source: Total of range 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 V O Stradner, H. (1962). Über neue und wenig bekannte Nannofossilien aus Kreide und Alttertiär. Verhandlungen der Geologischen Bundesanstalt (Wien). 2: 363-377. gs V OReferences:
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Corannulus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 12-4-2021
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 |