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 0-800Ma)
Elliptical, with 4, diagonal, cross-bars
Rotelapillus with central area spanned by 6 radial bars.
Rotelapillus with central area spanned by 8 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 8 radial bars.
A small, elliptical species of Rotelapillus with a high distal shield and >8 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.GS


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Rotelapillus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-4-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11043 Go 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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