Daughter taxa (time control age-window is: 0-800Ma)![]() | ||||
![]() | ![]() | ![]() | ![]() | Quadrilateris imparidividuus A small, narrowly rectangular holococcolith formed from four thin blocks that are birefringent in XPL. |
Quadrilateris sp. Specimens which cannot be assigned to any established species |
Taxonomy:
Distinguishing features: Rectangular holococcoliths formed from four thin blocks that are birefringent in XPL.
Farinacci & Howe catalog pages: Quadrilateris *
Search data:Tags | LITHS: holococcolith, quadrate, hollow, CA: bar, CROSS-POLARS: R-prominent, |
Metrics | Lith size: 2->4µm; Segments: 4->4; |
Geological Range:
Last occurrence (top): near top of Priabonian Stage (86% up, 34.4Ma, in Priabonian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Lutetian Stage (23% up, 46.3Ma, in Lutetian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Varol, O. (1991). New Cretaceous and Tertiary Calcareous Nannofossils. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 182: 211-237. gsReferences:
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Quadrilateris compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 12-4-2021
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1139 Go to Archive.is to create a permanent copy of this page - citation notes |