Similar to the rhabdoliths described within the novel genera Amitha and Notiocyrtolithus from the upper Eocene-lower Oligocene of the Otway Basin, SE Australia (Shafik 1989), which all possess a distinct collar and low domed process. However, in the SE Australian forms a cycle of radial laths with slits between them occurs between the collar and the domed process.
Possibly a junior synonym of Blackites elongatus (Roth 1970)
Distinguishing features:
Parent taxon (B. morionum group): Spine low, globular, height<2x width
This taxon: Small, varimorphic, sub-circular to elliptical rhabdoliths with a low domed process, formed of a continuous whorl of one lamellar cycle, and a distinct collar formed from an outwardly directed lamellar cycle.
Processes can vary from domed to conical.
| LITHS: planolith, elliptical, CA: ca_disjunct, grill, process, |
| Lith size: 3->5µm; Data source notes: lith size (spine height) from OD & slightly extended |
Geological Range:
Last occurrence (top): within NP19-20 zone (34.44-36.97Ma, top in Priabonian stage). Data source: Dunkley Jones et al., 2009
First occurrence (base): within NP19-20 zone (34.44-36.97Ma, base in Priabonian stage). Data source: Dunkley Jones et al., 2009
Plot of occurrence data:
Dunkley Jones, T., Bown, P. R. & Pearson, P. (2009). Exceptionally well preserved upper Eocene to lower Oligocene calcareous nannofossils (Prymnesiophycidae) from the Pande Formation (Kilwa Group), Tanzania. Journal of Systematic Palaeontology. 7(4): 359-411. gsReferences:

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Blackites shafikii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 7-9-2026
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=121 Go to Archive.is to create a permanent copy of this page - citation notes |
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