Nannotax3 - ntax_mesozoic

Nannotax3 - ntax_mesozoic - Ethmorhabdus Nannotax3 - ntax_mesozoic - Ethmorhabdus

Ethmorhabdus

Classification: ntax_mesozoic -> Podorhabdales -> Axopodorhabdaceae -> Ethmorhabdus
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: Elliptical, narrow rim; central area wide, spanned by multiperforate net, with or without axial cross and spine.

Daughter taxa (time control age-window is: 0-800Ma)
				Ethmorhabdus anglicus Small (4-6 µm) Ethmorhabdus with two cycles of relatively large perforations (20-30 in total).
				Ethmorhabdus crucifer Medium (5-8 µm) Ethmorhabdus, with prominent axial cross bars as well as net.
				Ethmorhabdus gallicus Medium (7-9 µm) Ethmorhabdus with finely perforate net.
				Ethmorhabdus hauterivianus Large (8-12 µm) Ethmorhabdus with finely perforate net, outline often irregular, spine absent
				Ethmorhabdus sp. Specimens not identified to species level

Taxonomy:

Citation: Ethmorhabdus Noël, 1965

taxonomic rank: Genus

Type species: Ethmorhabdus gallicus Noël, 1965

Farinacci & Howe catalog pages: Ethmorhabdus *

Search data:

LITHS: placolith, elliptical, CA: closed, grill, plate, process, CROSS-POLARS: R-prominent, V-prominent, rim-bicyclic,

Lith size: 4->12µm;
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 Barremian Stage (100% up, 121.4Ma, in Aptian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Early Toarcian Substage (177.50-184.20Ma, base in Toarcian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Axopodorhabdaceae

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

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

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

Ethmorhabdus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-10-2024

Taxon Search:

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