Nannoconaceae

Nannoconus Kamptner, 1931

Laminated coccolith in conical, globular or cylindrical in the side view. Corse to fine laminated plates is spirally arranged around an axial cavity or canal. The angle of laminated plates with horizontal plane varies greatly. It appears circular or angular at plan view. C-axis is tangential in polarised light.

Coccospheres of Nannoconus troelsenii was published by Albian Alves et al. (2017), and the coccopsphere of Nannoconus sp. is presented on the cover page of this site.

Alves, C. F., Lima, F. H., de O. & Shimabukoro, S., (2017): New Aptian calcareous nannofossil species from Brazil. - Journal of Nannoplankton Research. 37(1): 15-24.

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

Kamptner, E., (1931): Nannoconus steinmanni novo gen., novo spec., ein merkwurdiges gesteinbildendes Mikrofossil aus dem jungeren Mesozoikum der Alpen. - Paläontologische Zeitschrift. 13: 288-298.