Orthorhabdus rugosus

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


Citation: Orthorhabdus rugosus (Bramlette and Wilcoxon, 1967) Young & Bown 2014
Rank: Species
Basionym: Triquetrorhabdulus rugosus Bramlette and Wilcoxon, 1967
Synonyms: Ceratolithus farnsworthii Gartner, 1967 = Triquetrorhabdulus farnsworthii (Gartner, 1967) Perch-Nielsen 1984
Taxonomic discussion: The most common mid to late Miocene Orthorhabdus species. Specimens vary noticeably in shape and in degree of development of secondary ridges, the most extreme of these have been described as separate species (O. striatus, O. extensus, O. finifer). It might also be worth subdividing the more normal forms, as noted by Perch-Nielsen (1985).

Distinguishing features: Orthorhabdus species with three blades of variable width; broadest blade usually rodded.

Farinacci & Howe catalog pages: T. rugosus * , C. farnsworthii *

Search data:
TagsLITHS: nannolith-other, rod-shaped, CROSS-POLARS: 1ou, T-prominent,
MetricsLith 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): in lower part of NN12 zone (20% up, 5.5Ma, in Zanclean stage). Data source: from Young 1998, fig. 8.5
First occurrence (base): within NN6 zone (11.90-13.53Ma, base in Serravallian stage). Data source: Young 1998

Plot of occurrence data:


Bramlette, M. N. & Wilcoxon, J. A. (1967b). Middle Tertiary calcareous nannoplankton of the Cipero section, Trinidad, W.I. Tulane Studies in Geology and Paleontology. 5: 93-131. gs V O

de Kaenel, E. & Villa, G. (1996). Oligocene-Miocene calcareous nannofossil biostratigraphy and paleoeecology from the Iberian Abyssal Plain. Proceedings of the Ocean Drilling Program, Scientific Results. 149: 79-145. gs V O

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

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

Perch-Nielsen, K. (1972b). Remarks on Late Cretaceous to Pleistocene coccoliths from the North Atlantic. Initial Reports of the Deep Sea Drilling Project. 12: 1003-1069. gs V O

Perch-Nielsen, K. (1977a). Albian to Pleistocene calcareous nannofossils from the Western South Atlantic, DSDP Leg 39. Initial Reports of the Deep Sea Drilling Project. 39: 699-823. gs V O

Perch-Nielsen, K. (1984b). Validation of new combinations. INA Newsletter. 6(1): 42-46. gs V O

Perch-Nielsen, K. (1985a). Cenozoic calcareous nannofossils. In, Bolli, H. M. , Saunders, J. B. & Perch-Nielsen, K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 427-555. gs

Theodoridis, S. (1984). Calcareous nannofossil biostratigraphy of the Miocene and revision of the helicoliths and discoasters. Utrecht Micropaleontological Bulletin. 32: 1-271. gs V O

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


Orthorhabdus rugosus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 5-12-2020

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