Octopodorhabdus


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

Distinguishing features: Eliptical; central area spanned by eight bars that delineate eight large perforations. Central hollow spine.


Daughter taxa: (blue => in age window 0-300Ma)
Podorhabdids with central area spanned by eight bars that delineate eight large perforations that run either side of the longitudinal axis.
Specimens not identified to species level

Taxonomy:

Citation: Octopodorhabdus Noël, 1965
Rank: Genus
Type species: Octopodorhabdus praevisus Noël, 1965.
Notes & discussion: Note that although Octocyclus and Octopodorhabdus are very similar (and have been regarded as synonyms by e.g. Verbeek 1977) they occur respectively in the Late Cretaceous and Jurassic, so it is unlikely that they are directly related. The type species of Octopodorhabdus is based on avery unsatisfactory sketch and is never cited. So it would probably be best to get rid of the genus and recombine the rather disparate species that remain in it.

Farinacci & Howe catalog pages: Octopodorhabdus + *

Distinguishing features: Eliptical; central area spanned by eight bars that delineate eight large perforations. Central hollow spine.


Morphology remarks: The type species, Octopodorhabdus praevisus Noël, 1965, is a sketch showing holes at either end of the central area. However, the commonly seen Jurassic form, Octopodorhabdus decussatus (Manivit, 1961) Rood et al., 1971 has holes either side of the central longitudinal bar.

Geological Range:
Last occurrence (top): within Oxfordian Stage (157.25-163.47Ma, top in Oxfordian stage). Data source: Total of range of species in this database
First occurrence (base): within Bajocian Stage (168.28-170.30Ma, base in Bajocian 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.

Noël, D., (1965). Sur les Coccolithes du Jurassique Européen et d'Afrique du Nord. Éditions du Centre National de la Recherche Scientifique, Paris.


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Octopodorhabdus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-7-2018

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