Hexalithus


Classification: Mesozoic -> Braarudosphaerales -> Braarudosphaeraceae -> Hexalithus
Sister taxa: Braarudosphaera, Bukryaster, Hexalithus, Micrantholithus, Trapezopentus,

Distinguishing features: Six-rayed, stellate to hexagonal nannoliths formed from six elements.


Daughter taxa: (blue => in age window 0-300Ma)
Minute, subcircular nannolith with six elements.
Elements with indented edges.
Elements with lobate edges.
Elements with straight edges.
Specimens not identified to species level

Taxonomy:

Citation: Hexalithus Gardet, 1955
Rank: Genus
Type species: Hexalithus lecali Gardet, 1955.

Farinacci & Howe catalog pages: Hexalithus *

Distinguishing features: Six-rayed, stellate to hexagonal nannoliths formed from six elements.


Evolution & Phylogeny: Hexalithus appears in the Tithonian at about the same time as Nannoconus and Micrantholithus and it shows both tangential orientation and laminar substructure so it should be included within the Braarudosphaeraceae [my interpretation - JRY 2017]

Geological Range:
Last occurrence (top): within Campanian Stage (72.05-83.64Ma, top in Campanian stage). Data source: Total of range of species in this database
First occurrence (base): within Tithonian Stage (145.01-152.06Ma, base in Tithonian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bown, P.R. & Cooper, M.K.E., (1998). Jurassic. In: Bown, P.R. (Editor), Calcareous nannofossil biostratigraphy. British Micropalaeontological Society Publication Series. Chapman & Hall, pp. 34-85.

Burnett, J.A., (1998). Upper Cretaceous. In: Bown, P.R. (Editor), Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publications Series. Chapman & Hall, London, pp. 132-199.

Gardet, M., (1955). Contribution à l'étude des coccolithes des terrains néogènes de l'Algérie. Publications du Service de la Carte Géologique de l'Algérie (Nouvelle Série), 5: 477-550.


nannotaxlogo400px

Hexalithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 12-11-2018

Taxon Search:
Advanced Search
Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10524Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet. Be the first!

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics