Rotelapillus


Classification: Mesozoic -> Stephanolithiales -> Stephanolithiaceae -> Rotelapillus
Sister taxa: Corollithion, Cylindralithus, Darwinilithus, Paralithella, Rectocorona, Rhombolithion, Rotelapillus, Stephanolithion, Stoverius, Stradnerlithus, Thurmannolithion, Truncatoscaphus,

Distinguishing features: Subcircular to circular; rim high, narrow, bicyclic; central area spanned by radial bars; Short spines protrude from the rim


Daughter taxa: (blue => in age window 0-300Ma)
Rotelapillus with central area spanned by eight radial bars.
Rotelapillus with central area spanned by six radial bars.

LIke R. crenulatus but with quadrate shape due to four spines protruding from the rim

Elliptical to subcircular Rotelapillus with relatively low rim and central area spanned by eight radial bars.
Specimens not identified to species level

Taxonomy:

Citation: Rotelapillus Noël, 1973
Rank: Genus
Type species: Rotelapillus radians Noël, 1973.

Farinacci & Howe catalog pages: Rotelapillus + *

Distinguishing features: Subcircular to circular; rim high, narrow, bicyclic; central area spanned by radial bars; Short spines protrude from the rim


Morphology remarks: Subcircular to circular coccoliths with high, narrow rim and central area spanned by radial bars. Short spines protrude from the rim. The rim image is bicyclic in XPL.

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): within Tithonian Stage (145.01-152.06Ma, base in Tithonian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Noël, D., (1973). Nannofossiles calcaires de sédiments jurassiques finement laminés. Bulletin du Muséum National d'Histoire Naturelle, 3e serie, 75: 95-156.


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Rotelapillus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-12-2018

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11043Go to Archive.is to create a permanent copy of this page - citation notes



Comments (1)

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fatemeh (Mashhad, Iran)

hi

there is no the species R.laffitteiin the list.

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Jeremy Young (UK)

This is a famous taxonomic problem - the correct name for the species is Rotelapillus crenulatus - as explained on that page.

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