Staurolithites aenigma

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: Rim bicyclic central area with plate around the cross

Farinacci & Howe catalog pages: S. aenigma *

Morphology:

Geological Range:
Notes: The range is not well consttained but the species has been recorded from Late Albian to the Turonian (Gale et al. 2019, pers. comms Emma Sheldon, Jackie Lees April 2024)
Last occurrence (top): within Turonian Stage (89.39-93.90Ma, top in Turonian stage). Data source: pers. comm Emma Sheldon, Jackie Lees (April 2024)
First occurrence (base): within Late Albian Substage (100.50-107.59Ma, base in Albian stage). Data source: Burnett 1998

Plot of occurrence data:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
• Taxon plotted: Staurolithites aenigma, synonyms included - Staurolithites aenigma;
• See also space-time plot :: Samples map :: Parent: Staurolithites

Staurolithites aenigma compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-6-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11111 Go to Archive.is to create a permanent copy of this page - citation notes

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