Rucinolithus oriens

Classification: Mesozoic -> Nannoliths inc sedis -> Nannoliths inc sed - radiate multielement -> Rucinolithus -> Rucinolithus oriens
Sister taxa: R. hayi, R. magnus, R. oriens, R. wisei, R. pinnatus, R. sumastrocyclus, R. windleyae, R. sp.,

Distinguishing features: 6 long slender rays with dextral imbrication in distal view


Citation: Rucinolithus oriens Self-Trail 1999
Rank: Species
Notes & discussion: Possibly a better preserved variant of R. magnus [my interpretation - JRY 2017]

Farinacci & Howe catalog pages: Rucinolithus oriens *

Distinguishing features: 6 long slender rays with dextral imbrication in distal view

Morphology remarks: Round central area approximately 2.5 µm in diameter. Six dextrally-imbricated, asymmetrically-shaped rays extend outward from central area. Inner margins of ray segments meet and overlap slightly in the center. Rays can be extremely long, over twice the diameter of the central area, but are often broken and approximately one micrometer in length. Species can attain diameter of >7.5 µm when rays remain unbroken. Breakage of rays is often unequal, resulting in ragged appearance. Species prone to dissolution due to its delicate structure. [Self-Trail 1999]
Rucinolithus oriens most closely resembles Rucinolithus wisei, which has six sinistrally-curved, imbricated rays. It differs from R. wisei in having very long, slender, spider-like rays whose length can be more than twice the diameter of the central area. [Self-Trail 1999]

Search data:
TagsLITHS: nannolith-radiate, star-shaped, T-UNITS: T-prominent,
MetricsLith size: 5->15µm; Segments: 6->6;
Sources: original description & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within CC22 zone (75.93-76.82Ma, top in Campanian stage). Data source: Self-Trail (1999)
First occurrence (base): within CC21 zone (76.82-77.61Ma, base in Campanian stage). Data source: Self-Trail (1999)

Plot of occurrence data:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Rucinolithus


    Self-Trail, J. (1999). Some new and rarely documented Late Cretaceous calcareous nannofossils from subsurface sediments in South Carolina. Journal of Paleontology. 73(5): 952-963. gs :: ::


    Rucinolithus oriens compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 3-7-2020

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    Short stable page link: Go to to create a permanent copy of this page - citation notes

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