Daughter taxa (time control age-window is: 0-800Ma)
Granddaughter taxa
Faviconus Long, narrow columnar nannoliths formed from stacks of calcite laths around a narrow axial canal. May occur as linked groups of multiple columns.
Nannoconus Conical, globular or cylindrical nannoliths composed of plates spirally-arranged around an axial cavity (~>1µm in width) or canal (~<1µm in width). Plate c-axes are arranged tangentially to the longitudinal axis.
Citation: Nannoconaceae Deflandre, 1959Taxonomic rank: family
Distinguishing features: Parent taxon (Braarudosphaerales): 2N(?) cell covered by nannoliths with lamellar sub-structure and tangential C-axes. N: cell motile, covered by scales This taxon: Conical, globular or cylindrical nannoliths composed of plates spirally-arranged around an axial cavity or canal. Plate c-axes are arranged tangentially to the longitudinal axis.
Original description: Malgré les obscurités qui persistent sur la nature originelle des Nannoconus il me parait logique de leur donner une position taxinomique plus importante en créant pour eux la famille des Nannoconidés (Nannoconidae fam. nov. Type Nannoconus Kamptner), qui conservera présentement une place isolée.
Morphology: For an explanation of general nannoconid morphology and terminology see van Niel (1994) and Young et al. (1997).
Phylogenetic relationsFaviconus has long been included in the Nannoconaceae on the grounds that it seems to be a less organised precursor. However, Hexalithus and Polycyclolithus represent alternative possible ancestors and the two possibilities are not obviously compatible. [editor's comment - JRY 2019]
Search data:
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 Campanian Stage (100% up, 72.2Ma, in Campanian stage). Data source: Total of ranges of the species in this database First occurrence (base): within NJ15b subzone (149.47-156.78Ma, base in Oxfordian stage). Data source: Total of ranges 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: Braarudosphaerales
References:
Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 34-85. gsO
Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 132-199. gsO
Deflandre, G. (1959). Sur les nannofossiles calcaires et leur systématique. Revue de Micropaléontologie. 2: 127-152. gs
van Niel, B. E. (1994a). A review of the terminology used to describe the genus Nannoconus (calcareous nannofossil, incertae sedis). Cahiers de Micropaléontologie. 9: 27-47. gs
Young, J. R., et al. (1997). Guidelines for coccolith and calcareous nannofossil terminology. Palaeontology. 40: 875-912. gs
Missing or ambiguous references: ;
Nannoconaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-7-2025
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