arrayname: original
Distinguishing features:
Parent taxon (Polycostella): Globular and stellate nannoliths formed of 5-8 segments of stacked elements. Nannoconus-like in side view.
This taxon: Medium-sized (5-8 µm) with 6 segments
Taxonomy:
Farinacci & Howe catalog pages: P. senaria * , N. erbae *
Distinguishing features:
Parent taxon (Polycostella): Globular and stellate nannoliths formed of 5-8 segments of stacked elements. Nannoconus-like in side view.
This taxon: Medium-sized (5-8 µm) with 6 segments
Search data:
LITHS: nannolith-radiate, hollow, polygonal, star-shaped, cylindrical, CA: closed, CROSS-POLARS: T-prominent, |
Lith size: 3->8µm; Segments: 6->6; Data source notes: original description & illustrated specimens |
Geological Range:
Last occurrence (top): within Early Berriasian Substage (141.40-143.10Ma, top in Berriasian stage). Data source: Bown & Cooper 1998
First occurrence (base): in lower part of NJ17b subzone (20% up, 146.1Ma, in Tithonian stage). Data source: Bown & Cooper 1998 (fig. 4) - secondary events
Plot of occurrence data:
Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 34-85. gs O Casellato, C. E. (2010). Calcareous nannofossil biostratigraphy of Upper Callovian - Lower Berriasian successions from the Souhern Alps, North Italy. Rivista Italiana di Paleontologia e Stratigrafia. 116(3): 357-404. gs O Thierstein, H. R. (1971). Tentative Lower Cretaceous Calcareous Nannoplankton Zonation. Eclogae Geologicae Helvetiae. 64: 459-488. gs O Varol, O. & Bowman, A. R. (2019). Taxonomic revision of selected Late Jurassic (Tithonian) calcareous nannofossils and the application of mobile mounting. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 291: 65-87. gsReferences:
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Polycostella senaria compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-3-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10925 Go to Archive.is to create a permanent copy of this page - citation notes |
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