Tripinnalithus


Ancestry: Mesozoic -> Nannoliths inc sedis -> Nannoliths inc sed - other -> Tripinnalithus
Sister taxa: Ceratolithina, Ceratolithoides, Liliasterites, Marthasterites, Orthogonoides, Singanoa, Tripinnalithus, Watkinsia,

Short diagnosis: Elongate to diamond nannoliths with triradiate cross-section, c-axis parallel to nannolith length.


Daughter taxa (blue => in age window 0-300Ma)
Diamond-shaped nannolith formed from three triangular blades that are widest towards the blunter end. The whole nannolith is highly birefringent when oriented at 45° to the polarising directions (when the vertically standing blade reaches blue birefringence), and extinct when oriented parallel with the polarisers, i.e. the c-axis is parallel to the length.
Specimens not identified to species level

Taxonomy:

Citation: Tripinnalithus Young & Bown 2014
Rank: Genus
Synonyms: Triquetrorhabdulus? Martini 1965 sensu Perch-Nielsen 1988
Notes & discussion: Perch-Nielsen 1988 described a Lower Cretaceous species T. shetlandensis which she tentatively ascribed to Triquetrorhabdulus. The new name Tripinnalithus was proposed by Young & Bown (2014) since there is a gap of ca 100Ma between the occurrence of T. shetlandensis and the first occurrence of Triquetrorhabdulus in the Oligocene.

Farinacci & Howe catalog pages: Tripinnalithus *

Short diagnosis: Elongate to diamond nannoliths with triradiate cross-section, c-axis parallel to nannolith length.

Geological Range:
Last occurrence (top): within Valanginian Stage (133.88-139.39Ma, top in Valanginian stage). Data source: Total of range of species in this database
First occurrence (base): within Valanginian Stage (133.88-139.39Ma, base in Valanginian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Martini, E., (1965). Mid-Tertiary calcareous nannoplankton from Pacific deep-sea cores. Colston Papers, 17: 393-411.

Perch-Nielsen, K., (1988). New Lower Cretaceous calcareous nannofossil species from England. Newsletter of the International Nannoplankton Association, 10(1): 30-37.

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


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Tripinnalithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-10-2017

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