Nannoconus steinmannii

Classification: Mesozoic -> Braarudosphaerales -> Nannoconaceae -> Nannoconus -> N. steinmannii group -> Nannoconus steinmannii
Sister taxa: N. bermudezii, N. dolomiticus, N. farinacciae, N. regularis, N. steinmannii,

Short diagnosis: Pear-shaped to tapering

Daughter taxa (blue => in age window 0-300Ma)
Squat (<10µm), tapering
Tall (>10µm), pear-shaped to tapering


Citation: Nannoconus steinmanniiKamptner, 1931
Rank: Species
Basionym: Nannoconus steinmanniKamptner, 1931

Farinacci & Howe catalog pages: Nannoconus steinmanni *

Short diagnosis: Pear-shaped to tapering

Morphology remarks: Tapering, pear-shaped nannoconids with narrow central openings (canals) and walls formed from low-angled (<20 degrees), narrow cycles (<0.5µm). The width of the central opening is best judged using PC illumination.

Geological Range:
Last occurrence (top): in lower part of NC6b subzone (30% up, 125.3Ma, in Aptian stage). Data source: Bown et al. 1998, fig. 5.2
First occurrence (base): within Early Berriasian Substage (143.57-145.01Ma, base in Berriasian stage). Data source: Bown et al. 1998

Plot of occurrence data:


Bown, P.R.; Rutledge, D.C.; Crux, J.A. & Gallagher, L.T., (1998). Early Cretaceous. In: Bown, P.R. (Editor), Calcareous nannofossil biostratigraphy. British Micropalaeontological Society Publication Series. Chapman & Hall, pp. 86-131.

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


Nannoconus steinmannii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-12-2017

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Comments (2)

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Elliott Burden (Memorial University of Newfoundland, Canada)
I am looking for a contact that may help locate an old 1970's vintage coccolith sample perhaps housed/curated at Elf or Total in France. Basic questioning of my few contacts in the Calgary oil patch have not lead me to any French contacts.
maryam (Iran)
Thank you very much for very good information and Description of jurassic samples , nannofossils of lower cretaceous.Yours sincerely "maryam".
Jeremy Young (UCL, UK)
Thanks - it is good to hear you find the site useful
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