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 smaller and 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.
Rotelapillus with 6 robust central area bars and short, broad, central spine
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.

Search data:
TagsLITHS: murolith, circular, elliptical, cylindrical, hollow, CA: grill, DETAILS: ca_disjunct, rim-bicyclic,
MetricsLith size: 2->7µm;
Sources: size range of included species
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Tithonian Stage (0% up, 152.1Ma, 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: 7-4-2020

Taxon Search:
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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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