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Nannotax3 - ntax_mesozoic - Podorhabdus Nannotax3 - ntax_mesozoic - Podorhabdus

Podorhabdus


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

Distinguishing features:
Parent taxon (Axopodorhabdaceae): Regular placoliths; central-area, with cross-bars or perforated plate; often with tall, hollow spines.
Distal shield elements non-imbricate V-units; proximal shield and inner cycle formed from R-units. Rim often appears beaded in LM

This taxon: Sub-circular, rim broad; central area spanned by a granular bar supporting a broad, tall, hollow, flaring spine.


Daughter taxa (time control age-window is: 0-800Ma)
Podorhabdus grassei
Broadly elliptical to subcircular podorhabdid with central area spanned by a granular bar supporting a broad, tall, hollow, flaring spine.
Podorhabdus sp.
Specimens not identified to species level

Taxonomy:

Citation: Podorhabdus Noël, 1965
Taxonomic rank: genus
Type species: Podorhabdus grassei Noël, 1965.
Taxonomic discussion: Most species originally described in this genus have since been removed to other genera so it is now essentially monospecific. P? elkefensis is very unlikely to be directly related to P. grassei so should be removed from the genus.

Farinacci & Howe catalog pages: Podorhabdus + *

Distinguishing features:
Parent taxon (Axopodorhabdaceae): Regular placoliths; central-area, with cross-bars or perforated plate; often with tall, hollow spines.
Distal shield elements non-imbricate V-units; proximal shield and inner cycle formed from R-units. Rim often appears beaded in LM

This taxon: Sub-circular, rim broad; central area spanned by a granular bar supporting a broad, tall, hollow, flaring spine.


Morphology:

Described by Noël (1965) as having four ‘pillars’ but the type species holotype image shows just two (see discussion in Wise and Wind, 1977). Furthermore, Podorhabdus grassei may be a junior synonym of Rhabdolithus patulus Deflandre, 1954, which was designated the type species of Discorhabdus by Noël (1965).

Search data:
LITHS: placolith, circular, elliptical, CA: bar, closed, process, ca_disjunct, CROSS-POLARS: V-prominent, rim-bicyclic,
Lith size: 4->8µm;
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 NJ17a subzone (100% up, 146.3Ma, in Tithonian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NJ8b subzone (172.30-175.79Ma, base in Toarcian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

References:

Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 34-85. gs O

Deflandre, G. & Fert, C. (1954). Observations sur les coccolithophoridés actuels et fossiles en microscopie ordinaire et électronique. Annales de Paléontologie. 40: 115-176. gs

Noël, D. (1965). Sur les Coccolithes du Jurassique Européen et d'Afrique du Nord. Essai de classification des coccolithes fossiles. Éditions du Centre National de la Recherche Scientifique, Paris. 1-209. gs

Wise, S. W. & Wind, F. H. (1977). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 36 drilling on the Falkland Plateau, south-west Atlantic sector of the Southern Ocean. Initial Reports of the Deep Sea Drilling Project. 36(269-491): -. gs O


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Podorhabdus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-3-2025

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10919 Go to Archive.is to create a permanent copy of this page - citation notes
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