Lapideacassis asymmetrica


Classification: Coccolithophores -> Nannolith families inc sed -> Lapideacassaceae -> Lapideacassis -> Lapideacassis asymmetrica
Sister taxa: L. glans, L. mariae, L. asymmetrica, L. blackii, L. magnifica, L. bispinosa, L. wisei, L. trispina, L. multispinata, L. sp.,

Taxonomy:

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

Distinguishing features: 1 spine; asymmetric cone

Farinacci & Howe catalog pages: S. asymmetrica *


Morphology remarks: Nannolith consisting of a proximal tier, a proximal collar, a high distal tier, and an asymmetrical apical cone extending to a high apical process

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical, hollow, CA: process, CROSS-POLARS: R-prominent,
MetricsLith size: 8->10µm; Segments: 8->12;
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:
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:

References:

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


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Lapideacassis asymmetrica compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-9-2020

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=799 Go to Archive.is to create a permanent copy of this page - citation notes



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