Nannotax3 - ntax_mesozoic - Uniplanarius trifidus

Uniplanarius trifidus


Classification: ntax_mesozoic -> Braarudosphaerales -> Polycyclolithaceae -> Uniplanarius -> Uniplanarius trifidus
Sister taxa: U. clarkei, U. gothicus, U. sissinghii, U. trifidus, U. sp.

Distinguishing features:
Parent taxon (Uniplanarius): Stellate (triradiate or tetraradiate) nannoliths with three or four ray-like elements; there may be a small central diaphragm.
This taxon: Uniplanarius with three rays.


Taxonomy:

Citation: Uniplanarius trifidus (Stradner in Stradner & Papp, 1961) Hattner & Wise, in Wind & Wise 1983
Rank: Species
Basionym: Tetralithus trifidus Stradner in Stradner & Papp 1961
Synonyms: Quadrum trifidum (Stradner In Stradner & Papp 1961) Prins & Perch-Nielsen in Manivit et al. 1977
Tetralithus gothicus forma trifida (Stradner) Stradner, 1963
Tetralithus nitidus trifidus ? Marthasterites tenuis Shumenko 1976
Taxonomic discussion: The combination was initially proposed in Hattner & Wise 1980 but the original publication was not cited directly hence the proposal was technically invalid and so was proposed again, validly, in  Wind & Wise 1983

Farinacci & Howe catalog pages: T. trifidus * , T. gothicus trifidus * , M. tenuis *

Distinguishing features:
Parent taxon (Uniplanarius): Stellate (triradiate or tetraradiate) nannoliths with three or four ray-like elements; there may be a small central diaphragm.
This taxon: Uniplanarius with three rays.


Morphology:


Size:

Search data:
LITHS: nannolith-radiate, star-shaped, triangular, CA: closed, CROSS-POLARS: T-prominent,
Lith size: 6->15µm; Segments: 3->3;
Data source notes: 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 upper part of UC17 zone (80% up, 71.2Ma, in Maastrichtian stage). Data source: Burnett 1998, fig 6.6
First occurrence (base): at base of UC15d subzone (0% up, 76.8Ma, in Campanian stage). Data source: Burnett 1998 (subzonal marker)

Plot of occurrence data:

References:

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs O

Hattner, J. G. & Wise, S. W. (1980). Upper Cretaceous calcareous nannofossil biostratigraphy of South Carolina. South Carolina Geology. 24: 41-117. gs

Lees, J. A. & Bown, P. R. (2005). Upper Cretaceous calcareous nannofossil biostratigraphy, ODP Leg 198 (Shatsky Rise, Northwest Pacific Ocean). Proceedings of the Ocean Drilling Program, Scientific Results. 198: 1-60. gs V O

Manivit, H. (1989). Calcareous nannofossil biostratigraphy of Leg 108 sediments. Proceedings of the Ocean Drilling Program, Scientific Results. 108: 35-69. 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 O

Shumenko, S. I. (1976). Mesozoic calcareous nannoplankton of the European part of the USSR. Academy of Sciences of the USSR Paleontological Institute Scientific Council on the problem Evolutionary trends and patterns of animal and plant organisms. Nauka, . -. gs

Sissingh, W. (1977). Biostratigraphy of Cretaceous calcareous nannoplankton. Geologie en Mijnbouw. 65(1): 37-65. gs

Stradner, H. & Papp, A. (1961). Tertiäre Discoasteriden aus Österreich und deren stratigraphische Bedeutung mit Hinweisen auf Mexico, Rumanien und Italien. Jahrbuch der Geologischen Bundesanstalt, Sonderband. 7: 1-159. gs V O

Varol, O. (1992b). Taxonomic revision of the Polycyclolithaceae and its contribution to Cretaceous biostratigraphy. Newsletters on Stratigraphy. 27(93-127): -. gs

Wind, F. H. & Wise, S. W. (1983). Correlation of upper Campanian-lower Maestrichtian calcareous nannofossil assemblages in drill and piston cores from the Falkland Plateau, southwest Atlantic Ocean. Initial Reports of the Deep Sea Drilling Project. 71: 551-563. gs V O


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Uniplanarius trifidus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-9-2022

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