arrayname: original
Daughter taxa (time control age-window is: 0-800Ma)![]() | Granddaughter taxa | ||||
![]() | ![]() | ![]() | Triquetrorhabdulus carinatus Elongate (up to 50µm). All three blades identical, without ridges. | ||
![]() | Triquetrorhabdulus challengeri Short broad species with two wide blades bearing one to four subsidiary ridges parallel to a shorted median lath. Optic axis parallel to length. | ||||
![]() | ![]() | Triquetrorhabdulus milowii Short (8-15µm), broad (5-8µm) species of Triquetrorhabdulus with curved sides. All blades similar. | |||
![]() | ![]() | ![]() | ![]() | Triquetrorhabdulus nanhaiensis Like T. milowii but with two long spines, one at obtuse angle to main body | |
Triquetrorhabdulus sp. Specimens which cannot be assigned to established species |
Taxonomy:
Distinguishing features:
Parent taxon (Ceratolithaceae): Horseshoe-shaped rod-shaped nannoliths and simple hoop-coccoliths formed in one phase of life cycle, planolith heterococcoliths in the other.
This taxon: Elongate, tri-radiate nannoliths formed of a single calcite crystal with the c-axis parallel to the length of the nannolith. Nannolith straight with bilateral or trilateral symmetry. Shows high birefringence.
Farinacci & Howe catalog pages: Triquetrorhabdulus + *
Phylogenetic relations
LITHS: nannolith-other, rod-shaped, CROSS-POLARS: R-prominent, 1ou, |
Lith size: 8->50µm; Segments: 3->3; |
Geological Range:
Last occurrence (top): at top of NN6 zone (100% up, 11.9Ma, in Serravallian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NP24 zone (26.84-29.62Ma, base in Rupelian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Martini, E. (1965). Mid-Tertiary calcareous nannoplankton from Pacific deep-sea cores. Colston Papers. 17: 393-411. gs O 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 References:
![]() |
Triquetrorhabdulus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-3-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1437 Go to Archive.is to create a permanent copy of this page - citation notes |
![]() |
This policy contains information about your privacy. By posting, you are declaring that you understand this policy:
This policy is subject to change at any time and without notice.
These terms and conditions contain rules about posting comments. By submitting a comment, you are declaring that you agree with these rules:
Failure to comply with these rules may result in being banned from submitting further comments.
These terms and conditions are subject to change at any time and without notice.
Comments