arrayname: original 
Nannotax3 - ntax_cenozoic - Orthorhabdus striatus Nannotax3 - ntax_cenozoic - Orthorhabdus striatus

Orthorhabdus striatus


Classification: ntax_cenozoic -> Nannolith families inc sed -> Ceratolithaceae -> Orthorhabdus -> Orthorhabdus striatus
Sister taxa: O. serratus, O. rugosus, O. striatus, O. rioi, O. finifer, O. extensus, O. sp.

Taxonomy:

Citation: Orthorhabdus striatus ( Muller, 1974) Young & Bown 2014
Taxonomic rank: species
Basionym: Triquetrorhabdulus striatus (Muller, 1974)
Taxonomic discussion: Some specimens are dramatically different from typical O. rugosus but they vary considerably, and weak ridges occur on some typical O. rugosus specimens (e. g. Gartner 1967 pl. 9/1).

Distinguishing features:
Parent taxon (Orthorhabdus): Elongate nannoliths formed of three blades, with c-axis perpendicular to length. Usually curved and asymmetric. Shows low to moderate birefringence.
This taxon: Orthorhabdus species similar to O. rugosus but with subsidiary ridges on one of the lateral blades.

Farinacci & Howe catalog pages: T. striatus *


Morphology:

The subsidiary ridges seem to be primarily devolped on the lower surface of the nannolith (i.e. on the opposite side to the axial blade). 

Search data:
LITHS: nannolith-other, rod-shaped, CROSS-POLARS: T-prominent, 1ou,
Lith size: 10->20µm; Segments: 3->3;
Data source notes: lith length from OD & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NN12 zone (5.12-5.59Ma, top in Zanclean stage). Data source: Young 1998
First occurrence (base): within NN10 zone (8.29-9.53Ma, base in Tortonian stage). Data source: Young 1998

Plot of occurrence data:

References:

Gartner, S. (1967a). Calcareous nannofossils from Neogene of Trinidad, Jamaica, and Gulf of Mexico. University of Kansas Paleontological Contributions, Papers. 29: 1-7. gs

Müller, C. (1974). Calcareous nannoplankton, Leg 25 (Western Indian Ocean). Initial Reports of the Deep Sea Drilling Project. 25: 579-633. gs

Young, J. R. & Bown, P. R. (2014). Some emendments to calcareous nannoplankton taxonomy. Journal of Nannoplankton Research. 33(1): 39-46. gs

Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 225-265. gs


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Orthorhabdus striatus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-4-2025

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=975 Go to Archive.is to create a permanent copy of this page - citation notes
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