Tortolithus


Classification: Mesozoic -> Heterococcoliths inc sedis -> muroliths inc sedis -> Tortolithus
Sister taxa: Angulofenestrellithus, Coccosphaerida, Tortolithus,

Distinguishing features: Muroliths with central-area closed by overlapping plates.


Daughter taxa: (blue => in age window 0-800Ma)

A brightly-birefringent species of Tortolithus
Tortolithus with a murolith rim of 12 elements - 6 showing high birefringence and 6 low birefringence; central area with 3-5 overlapping plates showing low birefringence.
Minute (<1µm) and with central perforation




Specimens not identified to species level

Taxonomy:

Citation: Tortolithus Crux in Crux et al., 1982
Rank: Genus
Type species: Tortolithus caistorensis Crux in Crux et al., 1982

Farinacci & Howe catalog pages: Tortolithus * , ,

Distinguishing features: Muroliths with central-area closed by overlapping plates.

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Turonian Stage (0% up, 93.9Ma, in Turonian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Crux, J. A., Hamilton, G. B., Lord, A. R. & Taylor, R. J. (1982). Tortolithus gen. nov. Crux and new combinations of Mesozoic calcareous nannofossils from England. INA Newsletter. 4: 98-101. gs


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Tortolithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-7-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11226 Go to Archive.is to create a permanent copy of this page - citation notes



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