Nannotax3 - ntax_mesozoic - Nannoliths inc sed - radiate multielement

Nannoliths inc sed - radiate multielement


Classification: ntax_mesozoic -> Nannoliths inc sedis -> Nannoliths inc sed - radiate multielement
Sister taxa: Goniolithaceae, Eoconusphaeraceae, Lapideacassaceae, Microrhabdulaceae, Nannoliths inc sed - radiate multielement, Nannoliths inc sed - other

Distinguishing features:
Parent taxon (Nannoliths inc sedis): Nannofossils not obviously homologous with heterococcoliths, holococcoliths, or braarudosphaeralids
This taxon: Radiate nanoliths formed of multiple elements but lacking a central diaphragm


Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
Acadialithus
Squat tube-shaped nannoliths; wall formed of two vertically stacked cycles, with 6-7 elements per cycle; wide central opening; c-axes oblique
A. dennei
A. valentinei

Assipetra
Blocky to globular nannoliths typically formed from intergrown elements that may show radial symmetry.
A. infracretacea
A. terebrodentarius
A. sp.

Hayesites
Stellate nannoliths with 6-11 imbricate rays. Small subsidiary cycles and spines may be present.
H. albiensis
H. irregularis
H. sp.

Phosterolithus
Rosette-shaped radiate nannoliths with alternating elements having radial and tangential crystallographic orientations
P. prossii

Rucinolithus
Stellate nannoliths formed from 5 or more imbricating elements; small additional cycles may be present.Some at least may be calices from the top of spines of heterococcoliths.
R. hayi
R. magnus
R. oriens
R. wisei
R. pinnatus
R. sumastrocyclus
R. windleyae
R. sp.

Sikoraea
Birefringent and fusiform nannolith having a smooth surface with longitudinal slits which are confined to its apex, leaving an un-pierced section in the middle.
S. steinhaueri

Taxonomy:

Citation: Incertae sedis nannoliths formed of multiple, radiate elements
Rank: informal group of genera

Taxonomic discussion:
this is an informal grouping

Farinacci & Howe catalog pages: Nannoliths inc sed - radiate multielement [no catalog entry yet]

Distinguishing features:
Parent taxon (Nannoliths inc sedis): Nannofossils not obviously homologous with heterococcoliths, holococcoliths, or braarudosphaeralids
This taxon: Radiate nanoliths formed of multiple elements but lacking a central diaphragm


Morphology: This is a mixed group of taxa, they resemble Polycoliths in being multiradiate and formed of multiple elements but lack the median diaphragm

Search data:
TagsLITHS:
MetricsLith size: 0->0┬Ám;
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 Danian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Tithonian Stage (0% up, 152.1Ma, in Kimmeridgian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:


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Nannoliths inc sed - radiate multielement compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-10-2021

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10788 Go to Archive.is to create a permanent copy of this page - citation notes



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