Microrhabdulus


Classification: Mesozoic -> Nannoliths inc sedis -> Microrhabdulaceae -> Microrhabdulus
Sister taxa: Lithraphidites, Microrhabdulus, Pseudomicula, Singanoa,

Distinguishing features: Rod-shaped nannoliths with (sub)circular cross-section and complex construction from systematically arranged laths, commonly creating a "chequered" LM image.


Daughter taxa: (blue => in age window 0-800Ma)
Microrhabdulus tapering toward both ends and with rings of nodes.
Nearly parallel sided for most of length, in cross-polars shows chequerboard extinction
Microrhabdulus tapering toward both ends and with spiral structure.
Similar to M. decoratus but formed of undulating laths and extinction less regular
Specimens not identified to species level

Taxonomy:

Citation: Microrhabdulus Deflandre, 1959
Rank: Genus
Type species: Microrhabdulus decoratus Deflandre, 1959

Farinacci & Howe catalog pages: Microrhabdulus + *

Distinguishing features: Rod-shaped nannoliths with (sub)circular cross-section and complex construction from systematically arranged laths, commonly creating a "chequered" LM image.


Morphology remarks: Like Lithraphidites, these liths may represent disarticulated spines from minute, loosely-attached basal coccoliths.

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 Albian Stage (0% up, 113Ma, in Albian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs

Deflandre, G. (1959). Sur les nannofossiles calcaires et leur systématique. Revue de Micropaléontologie. 2: 127-152. gs


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Microrhabdulus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-12-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10667 Go to Archive.is to create a permanent copy of this page - citation notes



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