Distinguishing features:
Parent taxon (ntax_mesozoic): Mesozoic nannofossils - Cenozoic and extant taxa are in a separate module
This taxon: Nannofossils not obviously homologous with heterococcoliths, holococcoliths, or braarudosphaeralids
Daughter taxa (time control age-window is: 0-800Ma) | Granddaughter taxa | ||||
Goniolithaceae Pentagonal liths, with narrow rim and granular central area plate. Dark image in LM. | |||||
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. | |||||
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. | |||||
Microrhabdulaceae Rod-shaped nannoliths. | |||||
Nannoliths inc sed - radiate multielement Radiate nanoliths formed of multiple elements but lacking a central diaphragm | |||||
Nannoliths inc sed - other Nannolith genera without clear affinities to any other genera | Ceratolithina Ceratolithoides Liliasterites Marthasterites Orthogonoides Rhomboaster Tripinnalithus Watkinsia unidentified possible nannoliths |
Taxonomy:
Farinacci & Howe catalog pages:
Distinguishing features:
Parent taxon (ntax_mesozoic): Mesozoic nannofossils - Cenozoic and extant taxa are in a separate module
This taxon: Nannofossils not obviously homologous with heterococcoliths, holococcoliths, or braarudosphaeralids
Morphology:
Lith size: 0->0µm; |
Geological Range:
Last occurrence (top): at top of Oligocene Epoch (100% up, 23Ma, in Aquitanian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NT2b subzone (194.83-218.41Ma, base in Norian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
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 References:
Nannoliths inc sedis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 5-11-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10789 Go to Archive.is to create a permanent copy of this page - citation notes |
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