Nannotax3 - ntax_main - Staurolithites dibrachiatus Nannotax3 - ntax_main - Staurolithites dibrachiatus

Staurolithites dibrachiatus


Classification: ntax_main -> Mesozoic nannofossils -> Eiffellithales -> Chiastozygaceae -> Staurolithites -> Staurolithites dibrachiatus
Sister taxa: S. primaevus ⟩⟨ S. dibrachiatus, S. stradneri ⟩⟨ S. dentatus, S. eiffellithoides, S. flavus, S. halfanii, S. minutus, S. ngurumahambaensis, S. quadriarcullus, S. siesseri ⟩⟨ S. coroniformis, S. gausorhethium, S. leptostaurus ⟩⟨ S. ormae, S. handleyi, S. laffittei> >>

Taxonomy:

Citation: Staurolithites dibrachiatus (Gartner, 1968) Young & Bown 2014
Taxonomic rank: species
Basionym: Vekshinella dibrachiata Gartner, 1968
Synonyms:
Taxonomic discussion: The name dibrachiatus was based on a medium sized (5µm) Late Cretaceous form. Grun & Zweili (1980) and Zweili (1989) used it for a small Jurassic form (3-4 µm) but these can better be placed in S. stradneri.

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: Unicyclic rim and broad, medianly split, cross-bars.

Farinacci & Howe catalog pages: V. dibrachiata *

Search data:
LITHS: murolith, elliptical, CA: cross-axial, ca_disjunct, process, CROSS-POLARS: rim-unicyclic, V-prominent,
Lith size: 5->7µm;
Data source notes: original description & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Notes: A poorly defined species which has been recorded from a wide stratigraphic range
Last occurrence (top): within Maastrichtian Stage (66.04-72.17Ma, top in Maastrichtian stage). Data source: specimens illustrated here by Wind & Wise 1977
First occurrence (base): within Campanian Stage (72.17-83.65Ma, base in Campanian stage). Data source: original descripition

Plot of occurrence data:

References:

Gartner, S. (1968). Coccoliths and related calcareous nannofossils from Upper Cretaceous deposits of Texas and Arkansas. University of Kansas Paleontological Contributions, Articles. 48 (Protista 1): 1-56. gs O

Rahman, A. & Roth, P. H. (1991). Upper Jurassic calcareous nannofossils from the DSDP Site 534 in the Blake Bahama Basin, western North Atlantic. Eclogae Geologicae Helvetiae. 84: 765-789. gs O

Wise, S. W. & Wind, F. H. (1977). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 36 drilling on the Falkland Plateau, south-west Atlantic sector of the Southern Ocean. Initial Reports of the Deep Sea Drilling Project. 36(269-491): -. gs O

Young, J. R. & Bown, P. R. (2014). Some emendments to calcareous nannoplankton taxonomy. Journal of Nannoplankton Research. 33(1): 39-46. gs


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Staurolithites dibrachiatus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-6-2025

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11116 Go to Archive.is to create a permanent copy of this page - citation notes



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