Nannoliths inc sedis
Classification: ntax_mesozoic -> Nannoliths inc sedis
Sister taxa: Arkhangelskiales, Eiffellithales, Stephanolithiales, Podorhabdales, Watznaueriales, Syracosphaerales, Heterococcoliths inc sedis ⟩⟨ Holococcoliths, Braarudosphaerales, Nannoliths inc sedis, Mesozoic non–coccoliths, hidden
Distinguishing features: Nannofossils not obviously homologous with heterococcoliths, holococcoliths, or braarudosphaeralids
| Daughter taxa: (blue => in age window 0-800Ma) | Granddaughter taxa |
 |  |  | | Goniolithaceae
Pentagonal liths, with narrow rim and granular central area plate. Dark image in LM.
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 |  |  |  | Eoconusphaeraceae
Nannoliths with a truncated-cone-like morphology constructed from an outer rim of thin, elements joined along vertical sutures, and an inner core of numerous radial lamellae that may protrude distally.
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 |  |  |  | Lapideacassaceae
Hemispherical to tall cylindrical nannoliths, with narrow walls constructed from one to several cycles of thin elements, enclosing a hollow central space; the nannolith tapers distally, and may have apical spines or processes.
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 |  |  |  | Microrhabdulaceae
Rod-shaped nannoliths.
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 |  |  |  | Nannoliths inc sed - radiate multielement
Radiate nanoliths formed of multiple elements but lacking a central diaphragm
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 |  |  |  | Nannoliths inc sed - other
Nannolith genera without clear affinities to any other genera
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Taxonomy:
Citation: Nannoliths inc sedisRank: Informal group of families
Farinacci & Howe catalog pages: Nannoliths [no catalog entry yet]
Distinguishing features: Nannofossils not obviously homologous with heterococcoliths, holococcoliths, or braarudosphaeralids
Morphology: The term nannolith appears to have been introduced by Haq (1978), it is also discussed in e.g. Young et al. (1997). The Mesozoic nannoliths are a very mixed grouping but include many biostratigraphically important taxa.
Search data:
| Tags | 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 Chattian Stage (100% up, 23Ma, in Chattian stage). Data source: Total of range of species in this database
First occurrence (base): in mid part of Norian Stage (50% up, 218.9Ma, in Norian 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: ntax_mesozoic
References:
Bown, P. R. (1998b). Triassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 29-33. gs
Haq, B. U. (1978). Calcareous nannoplankton. In, Haq, B. U. & Boersma, A. (eds) Introduction to marine micropaleontology. Elsevier, Amsterdam 79-108. gs
Young, J. R. et al. (1997). Guidelines for coccolith and calcareous nannofossil terminology. Palaeontology. 40: 875-912. gs V O
