Distinguishing features:
Parent taxon (Lapideacassis): Hemispherical to cylindrical nannoliths, with walls constructed from one to several cycles of thin elements, enclosing a hollow central space; the nannolith tapers distally, and may have long apical spines or processes.
Species arranged here by number of spines.
This taxon: 3, asymmetric, spines; proximal collar
Farinacci & Howe catalog pages:
S. wisei *
| LITHS: nannolith-radiate, circular, cylindrical, hollow, CA: process, CROSS-POLARS: R-prominent, |
| Lith size: 6->12µm; Segments: 6->10; Data source notes: length (excluding spines) from illustrated specimens; elem numbers from count on SEM image and extend range by +-2 |
Geological Range:
Last occurrence (top): within NP9 zone (55.86-57.21Ma, top in Ypresian stage). Data source: Perch-Nielsen & Franz 1977
First occurrence (base): within NP3 zone (63.25-64.81Ma, base in Danian stage). Data source: Perch-Nielsen & Franz 1977
Plot of occurrence data:
Perch-Nielsen, K. & Franz, H. E. (1977). Lapideacassis and Scampanella, calcareous nannofossils from the Paleocene at sites 354 and 356, DSDP Leg 39, Southern Atlantic. Initial Reports of the Deep Sea Drilling Project. 39: 849-862. gs Young, J. R. & Bown, P. R. (2014). Some emendments to calcareous nannoplankton taxonomy. Journal of Nannoplankton Research. 33(1): 39-46. gs References:

![]()
![]()
![]() |
Lapideacassis wisei compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-6-2026
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=808 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