Lapideacassis asymmetrica

Classification: ntax_mesozoic -> Nannoliths inc sedis -> Lapideacassaceae -> Lapideacassis -> Lapideacassis asymmetrica
Sister taxa: L. asymmetrica, L. bispinosa, L. cornuta, L. glans, L. magnifica, L. mariae, L. tricornus, L. trispina, L. sp.

Distinguishing features: Single spine, offset from centre  (hence asymmetrica)


Citation: Lapideacassis asymmetrica (Perch-Nielsen in Perch-Nielsen & Franz, 1977) Burnett, 1997
Rank: Species
Basionym: Scampanella asymmetrica Perch-Nielsen in Perch-Nielsen & Franz, 1977

Farinacci & Howe catalog pages: S. asymmetrica *

Distinguishing features: Single spine, offset from centre  (hence asymmetrica)

Search data:
TagsLITHS: nannolith-radiate, asymmetric, circular, cylindrical, hollow, CA: pores, process, closed, CROSS-POLARS: R-prominent,
MetricsLith size: 8->10µm; Segments: 10->14;
Data source notes: length (excluding spines) from illustrated specimens; elem numbers from count on SEM image and extend range by +-2
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: Paleocene occurrence may be Cretaceous reworking according to Perch-Nielsen and Franz (1977).
Last occurrence (top): within NP5 zone (59.54-61.51Ma, top in Selandian stage). Data source: Perch-Nielsen & Franz 1977
First occurrence (base): within Santonian Stage (83.64-86.26Ma, base in Santonian stage). Data source: Burnett 1998

Plot of occurrence data:


Burnett, J. A. (1997c). New species and new combinations of Cretaceous nannofossils and a note on the origin of Petrarhabdus (Deflandre) Wise & Wind. Journal of Nannoplankton Research. 19(2): 133-146. gs V O

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs V O

Lees, J. A. & Bown, P. R. (2005). Upper Cretaceous calcareous nannofossil biostratigraphy, ODP Leg 198 (Shatsky Rise, Northwest Pacific Ocean). Proceedings of the Ocean Drilling Program, Scientific Results. 198: 1-60. gs V O

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 V O

Perez-Rodriguez, I., Lees, J. A., Larasoaña, J. C., Arz, J. A. & Arenillas, I. (2012). Planktonic foraminiferal and calcareous nannofossil biostratigraphy and magnetostratigraphy of the uppermost Campanian and Maastrichtian at Zumaia, northern Spain. Cretaceous Research. 37: 100-126. gs


Lapideacassis asymmetrica compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-3-2021

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