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Triquetrorhabdulus rugosus

Edited by Lyndsey on Thu, 10/03/2011 - 13:48

Triquetrorhabdulus rugosus Bramlette and Wilcoxon, 1967

Description: Triquetrorhabdulus species with three blades of variable width, c-axis perpendicular to length. Broadest blade usually rodded.

Remarks: The most common mid to late Miocene Triquetrorhabuduls 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 (T. striatus, T. extensus, T. finifer). It might also be worth subdividing the more normal forms, as noted by Perch-Nielsen (1985b).

Synonym: Ceratolithus farnsworthii Gartner, 1967.

Original description:

Triquetrorhabdulus rugosus 080355.jpgTriquetrorhabdulus rugosus 080356.jpg

9-21rugosus.JPG 9-22rugosus.JPG 9-25farnsworthii.JPG 9-24farnsworthii.JPG 9-23rugosus.JPG



Geological Time Data
Geological Time Periods: 
NN12
NN6
Biblio Reference: 
Young, JR.  1998.  Neogene. Calcareous nannofossil biostratigraphy. :225-265.
Scratchpads developed and conceived by: Vince Smith, Simon Rycroft, Dave Roberts, Ben Scott...