Distinguishing features: Radiate nanoliths formed of multiple elements but lacking a central diaphragm
Daughter taxa: (blue => in age window 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 | |||||
![]() | ![]() | ![]() | ![]() | Assipetra Blocky to globular nannoliths typically formed from intergrown elements that may show radial symmetry. | |
![]() | ![]() | ![]() | ![]() | Hayesites Stellate nannoliths with 6-11 imbricate rays. Small subsidiary cycles and spines may be present. | |
Phosterolithus Rosette-shaped radiate nannoliths with alternating elements having radial and tangential crystallographic orientations | |||||
![]() | ![]() | ![]() | ![]() | 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. |
Taxonomy:
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: This is a mixed group of taxa, they resemble Polycoliths in being multiradiate and formed of multiple elements but lack the median diaphragm
Tags | LITHS: |
Metrics | Lith size: 0->0µm; |
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:
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Nannoliths inc sed - radiate multielement compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-1-2021
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 |