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
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.
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.
Citation: Incertae sedis nannoliths formed of multiple, radiate elements Rank: informal group of genera Taxonomic discussion: this is an informal grouping
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
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LITHS:
Metrics
Lith size: 0->0µm;
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:
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
Neptune data: this is a higher taxon page so Neptune data is not plotted. For the customisable plot option go to a genus page Parent: Nannoliths inc sedis
References:
Nannoliths inc sed - radiate multielement compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-10-2021
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