Nannotax3 - ntax_mesozoic - Rhombolithion minutum

Nannotax3 - ntax_mesozoic - Rhombolithion minutum <title>Nannotax3 - ntax_mesozoic - Rhombolithion minutum

Rhombolithion minutum

Classification: ntax_mesozoic -> Stephanolithiales -> Stephanolithiaceae -> Rhombolithion -> Rhombolithion minutum
Sister taxa: R. minutum, R. scutulatus, R. rhombicum, R. octocostatum, R. horrellii, R. rotatum, R. duodecostatum, R. sp.

Distinguishing features:
Parent taxon (Rhombolithion): Diamond-shaped; rim unicyclic (stradnerlithids).
This taxon: Rhombolithion with central area spanned by diagonal bars.

RoodB72pl2-10.JPG
RoodHayB71pl2-6.JPG
RoodB72fig2-9.JPG

Taxonomy:

Citation: Rhombolithion minutum (Rood et al., 1971) Young & Bown 2014

Rank: Species

Basionym: Diadorhombus minutus Rood et al., 1971

Taxonomic discussion: Transferred from Rhombolithion by Young & Bown (2014) since the wall structure indicates it should be in the Stephanolithaceae not the Chiastozygaceae.

Farinacci & Howe catalog pages: D. minutus *

Distinguishing features:
Parent taxon (Rhombolithion): Diamond-shaped; rim unicyclic (stradnerlithids).
This taxon: Rhombolithion with central area spanned by diagonal bars.

Morphology:

Size:

Ecology & Biogeography

Biology & life-cycles

Phylogenetic relations

Search data:

LITHS: murolith, quadrate, CA: ca_disjunct, process, diagonal cross,

Lith size: 2->3µm;
Data source notes: holotype +/- 0.5 µm

The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Oxfordian Stage (157.25-163.47Ma, top in Oxfordian stage). Data source: original description - real range probably longer
First occurrence (base): within Oxfordian Stage (157.25-163.47Ma, base in Oxfordian stage). Data source: original description - real range probably longer

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Rhombolithion

References:

Rood, A. P. & Barnard, T. (1972). On Jurassic coccoliths: Stephanolithion, Diadozygus and related genera. Eclogae Geologicae Helvetiae. 65: 327-342. gs V O

Rood, A. P., Hay, W. W. & Barnard, T. (1971). Electron Microscope Studies of Oxford Clay Coccoliths. Eclogae Geologicae Helvetiae. 64: 245-272. gs O

Young, J. R. & Bown, P. R. (2014). Some emendments to calcareous nannoplankton taxonomy. Journal of Nannoplankton Research. 33(1): 39-46. gs V O

Rhombolithion minutum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-1-2023

Taxon Search:

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AphiaID: not found
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11037 Go to Archive.is to create a permanent copy of this page - citation notes

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