Nannoconaceae


Classification: Mesozoic -> Braarudosphaerales -> Nannoconaceae
Sister taxa: Braarudosphaeraceae, Nannoconaceae,

Short diagnosis: 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.


Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
Long, narrow columnar nannoliths formed from stacks of calcite laths around a narrow axial canal. May occur as linked groups of multiple columns.

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.

Taxonomy:

Citation: Nannoconaceae Deflandre, 1959
Rank: Family

Farinacci & Howe catalog pages: Nannoconaceae [no catalog entry yet]

Short diagnosis: 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.


Morphology remarks: For an explanation of general nannoconid morphology and terminology see van Niel (1994) and Young et al. (1997).

Geological Range:
Last occurrence (top): within Campanian Stage (72.05-83.64Ma, top in Campanian stage). Data source: Total of range of species in this database
First occurrence (base): within Oxfordian Stage (157.25-163.47Ma, base in Oxfordian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bown, P.R. & Cooper, M.K.E., (1998). Jurassic. In: Bown, P.R. (Editor), Calcareous nannofossil biostratigraphy. British Micropalaeontological Society Publication Series. Chapman & Hall, pp. 34-85.

Burnett, J.A., (1998). Upper Cretaceous. In: Bown, P.R. (Editor), Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publications Series. Chapman & Hall, London, pp. 132-199.

Deflandre, G., (1959). Sur les nannofossiles calcaires et leur systématique. Revue de Micropaleontologie, 2: 127-152.

van Niel, B.E., (1994). A review of the terminology used to describe the genus Nannoconus (calcareous nannofossil, incertae sedis. Cahiers de Micropaleontologie, 9(27-47).

van Niel, B.E., (1994). Scanning electron micrographs of the genus Kokia (incertae sedis). Journal of Nannoplankton Research, 16(2): 75-77.

Young, J.R. & others, (1997). Guidelines for coccolith and calcareous nannofossil terminology. Palaeontology, 40: 875-912.


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Nannoconaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-11-2017

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