Zeugrhabdotus


Classification: Coccolithophores -> Mesozoic Survivors -> Chiastozygaceae -> Zeugrhabdotus
Sister taxa: Jakubowskia, Neocrepidolithus, Staurolithites, Zeugrhabdotus,

Distinguishing features: Murolith (loxolith) coccoliths with central area spanned by variably constructed transverse bar. The bar is usually spine bearing. Inner/proximal rim cycle is variably developed and so the LM image may be unicyclic or bicyclic. Delicate lateral bars may also be present but are generally only seen in exceptional preservation.


Daughter taxa: (blue => in age window 0-800Ma)
Zeugrhabdotus with relatively broad rim and narrow central area spanned by a spine-bearing bar that narrows at both ends. Broad bright inner cycle in XPL.
Zeugrhabdotus with relatively narrow rim and wide central area spanned by a spine-bearing bar that narrows at both ends. Narrow bright inner cycle in XPL that broadens where the bar meets the rim.
Specimens which cannot be assigned to any established species

Taxonomy:

Citation: Zeugrhabdotus Reinhardt, 1965
Rank: Genus
Type species: Zeugrhabdotus erectus (Deflandre, 1954) [Zygolithus] designated by Reinhardt, 1965.

Farinacci & Howe catalog pages: Zeugrhabdotus + + *

Distinguishing features: Murolith (loxolith) coccoliths with central area spanned by variably constructed transverse bar. The bar is usually spine bearing. Inner/proximal rim cycle is variably developed and so the LM image may be unicyclic or bicyclic. Delicate lateral bars may also be present but are generally only seen in exceptional preservation.

Search data:
TagsLITHS: murolith, elliptical, RIM: outer wall cw-imbricate, CA: bar-transverse, PROCESS: spine,
CSPH: not known, V-UNITS: outer-rim, R-UNITS: inner-rim, DETAILS: ca_disjunct, rim-bicyclic,
MetricsLith size: 6->11µm;
Sources:
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): in upper part of Thanetian Stage (78% up, 56.7Ma, in Thanetian stage). Data source: Total of range of species in this database
First occurrence (base): near base of Tithonian Stage (8% up, 151.5Ma, 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.GS

Reinhardt, P., (1965). Neue Familien für fossile Kalkflagellaten (Coccolithophoriden, Coccolithineen). Monatsberichte der Deutschen Akademie der Wissenschaften zu Berlin, 7: 30-40.GS


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Zeugrhabdotus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-3-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1510 Go to Archive.is to create a permanent copy of this page - citation notes



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