Nannoliths inc sed - radiate multielement


Ancestry: Mesozoic -> Nannoliths inc sedis -> Nannoliths inc sed - radiate multielement
Sister taxa: Goniolithaceae, Eoconusphaeraceae, Lapideacassaceae, Microrhabdulaceae, Polycyclolithaceae, Nannoliths inc sed - radiate multielement, Nannoliths inc sed - other,

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


Daughter taxa (blue => in age window 0-300Ma) 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.

Stellate, multiradiate, rosette-shaped nannoliths constructed from >6 single crystal-unit radial rays that show grey to white birefringence under XPL.

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

Globular and stellate nannoliths formed from roughly radial or radial elements.

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.

Cylindrical nannoliths, typically with flanges at both ends and so cotton-reel-shaped in side view.

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]

Short diagnosis: 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): 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:


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Nannoliths inc sed - radiate multielement compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-9-2017

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