Nannoliths inc sed - radiate multielement


Classification: 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: Radiate nanoliths formed of multiple elements but lacking a central diaphragm


Daughter taxa: (blue => in age window 0-800Ma) Granddaughter taxa
Squat tube-shaped nannoliths; wall formed of two vertically stacked cycles, with 6-7 elements per cycle; wide central opening; c-axes oblique

Blocky to globular nannoliths typically formed from intergrown elements that may show radial symmetry.

Stellate nannoliths with 6-11 imbricate rays. Small subsidiary cycles and spines may be present.

Rosette-shaped radiate nannoliths with alternating elements having radial and tangential crystallographic orientations

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.

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.

Taxonomy:

Citation: Incertae sedis nannoliths formed of multiple, radiate elements
Rank: informal group
Notes & discussion: this is an informal grouping

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

Distinguishing features: Radiate nanoliths formed of multiple elements but lacking a central diaphragm


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

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:


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Nannoliths inc sed - radiate multielement compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 13-11-2019

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Short stable page link: http://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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