Octocyclus


Classification: ntax_mesozoic -> Podorhabdales -> Axopodorhabdaceae -> Octocyclus
Sister taxa: Podorhabdus, Hemipodorhabdus, Axopodorhabdus, Tetrapodorhabdus, Hexapodorhabdus, Octocyclus, Octopodorhabdus ⟩⟨ Dodekapodorhabdus, Perissocyclus, Teichorhabdus ⟩⟨ Cribrosphaerella, Ethmorhabdus, Nephrolithus, Psyktosphaera ⟩⟨ Cribrocorona

Distinguishing features: Elliptical; central area spanned by eight bars delineating eight large perforations arranged either side of the long axis.


Daughter taxa (time control age-window is: 0-800Ma)
Octocyclus magnus
Large podorhabdid with central area spanned by eight bars that delineate eight large perforations that run either side of the longitudinal axis. Central hollow spine.
Octocyclus reinhardtii
Podorhabdid with central area spanned by eight bars that delineate eight large perforations that run either side of the longitudinal axis.
Octocyclus sp.
Specimens not identified to species level

Taxonomy:

Citation: Octocyclus Black, 1972
Rank: Genus
Type species: Octocyclus magnus Black, 1972.
Taxonomic discussion: Note that although Octocyclus and Octopodorhabdus are very similar they occur respectively in the Late Cretaceous and Jurassic, so it unlikely that they are directly related

Farinacci & Howe catalog pages: Octocyclus *

Distinguishing features: Elliptical; central area spanned by eight bars delineating eight large perforations arranged either side of the long axis.

Search data:
TagsLITHS: placolith, ca_disjunct, grill, pores, process, CROSS-POLARS: rim-bicyclic, V-prominent,
MetricsLith size: 8->15┬Ám;
Data source notes: size range of included species
The morphological data given here can be used on the advanced search page. See also these notes

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:

Black, M. (1972a). British Lower Cretaceous Coccoliths. I-Gault Clay (Part 1). Palaeontographical Society Monograph. 126: 1-48. gs

Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs


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Octocyclus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-4-2021

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10808 Go to Archive.is to create a permanent copy of this page - citation notes



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