Distinguishing features:
Parent taxon (Ethmorhabdus): Elliptical, narrow rim; central area wide, spanned by multiperforate net, with or without axial cross and spine.
This taxon: Medium (5-8 µm) Ethmorhabdus, with prominent axial cross bars as well as net.
Taxonomy:
Farinacci & Howe catalog pages: E. crucifer *
Distinguishing features:
Parent taxon (Ethmorhabdus): Elliptical, narrow rim; central area wide, spanned by multiperforate net, with or without axial cross and spine.
This taxon: Medium (5-8 µm) Ethmorhabdus, with prominent axial cross bars as well as net.
Search data:
LITHS: placolith, elliptical, CA: closed, cross-axial, grill, plate, process, ca_disjunct, CROSS-POLARS: R-prominent, V-prominent, rim-bicyclic, |
Lith size: 5->8µm; Data source notes: illustrated specimens (large error margin) |
Geological Range:
Last occurrence (top): within Early Toarcian Substage (177.50-184.20Ma, top in Toarcian stage). Data source: Bown & Cooper 1998
First occurrence (base): within Early Toarcian Substage (177.50-184.20Ma, base in Toarcian stage). Data source: Bown & Cooper 1998
Plot of occurrence data:
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 Goy, G., Noël, D. & Busson, G. (1979). Les conditions de sédimentation des schistes-carton (Toarcien inf.) du bassin de Paris déduites de l'étude des nannofossiles calcaires et des diagraphies. Document des Laboratoires de Géologie de la Faculté des Sciences de Lyon. 75: 33-57. gs O Menini, A., Mattioli, E., Spangenberg, J. E., Pittet, B. & Suan, G. (2018). New calcareous nannofossil and carbon isotope data for the Pliensbachian/Toarcian boundary (Early Jurassic) in the western Tethys and their paleoenvironmental implications. Newsletters on Stratigraphy. -. gs Noël, D. (1973). Nannofossiles calcaires de sédiments jurassiques finement laminés. Bulletin du Muséum National d'Histoire Naturelle, Paris. 75 [1972]: 95-156. gs References:
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Ethmorhabdus crucifer compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 14-2-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10441 Go to Archive.is to create a permanent copy of this page - citation notes |
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Comments (2)
Dear Jeremy,
The original description of this species is in Noël, 1972 (Nannofossiles calcaires de sédiments jurassiques finement laminés. Bull. Mus. Nat. Hist. Natur.,
3e sér., n° 75, pp. 95-156)
Citation would be: Ethmorhabdus crucifer Noël, 1972
Kind regards,
Mica
Thanks Mica and I have corrected that now. Strictly though the correct publication date is 1973, even though the cover date on the article is 1972.
Jeremy