Taxonomy:
Distinguishing features:
Parent taxon (Staurolithites): Loxolith muroliths with relatively narrow rim and wide central area spanned by axial cross bars. The cross is usually spine bearing. Inner/proximal rim cycle is variably developed and so the LM image may be unicyclic or bicyclic. NB The bicyclic/unicyclic separation is simply controlled by how far the inwards the R-units develop so, although it is a useful identification criterion, it almost certainly has no real phylogenetic significance and would be a very poor character for defining genera.
This taxon: Medium sized (4-6 µm), bicyclic, with broad birefringent cross bars, and narrow inner rim cycle.
Farinacci & Howe catalog pages: S. lumina *
Search data:
LITHS: murolith, elliptical, CA: cross-axial, ca_disjunct, process, CROSS-POLARS: rim-bicyclic, V-prominent, |
Lith size: 4->6µm; Data source notes: holotype +/-1µm |
Geological Range:
Last occurrence (top): within NJ16b subzone (148.67-149.10Ma, top in Tithonian stage). Data source: Bown & Cooper 1998
First occurrence (base): within NJ15b subzone (149.47-156.78Ma, base in Oxfordian stage). Data source: Bown & Cooper 1998
Plot of occurrence data:
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Staurolithites lumina compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-6-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11131 Go to Archive.is to create a permanent copy of this page - citation notes |
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