Nannoconus steinmannii

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

Distinguishing features: Pear-shaped to tapering

Daughter taxa: (blue => in age window 0-800Ma)
Nannoconus steinmannii subsp. minor
Squat (<10µm), tapering
Nannoconus steinmannii subsp. steinmannii
Tall (>10µm), pear-shaped to tapering


Citation: Nannoconus steinmannii Kamptner, 1931
Rank: Species
Basionym: Nannoconus steinmanni Kamptner, 1931

Farinacci & Howe catalog pages: N. steinmanni *

Distinguishing features: Pear-shaped to tapering

Morphology: 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.

Search data:
TagsLITHS: nannolith-radiate, circular, cylindrical, hollow, CA: vacant, CROSS-POLARS: T-prominent,
MetricsLith size: 8->15µm;
Data source notes: range of sub-species
The morphological data given here can be used on the advanced search page. See also these notes

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. (2005c). Early to Mid-Cretaceous Calcareous Nannoplankton from the Northwest Pacific Ocean, Leg 198, Shatsky Rise. Proceedings of the Ocean Drilling Program, Scientific Results. 198: 1-82. gs V O

Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs

Brönnimann, P. (1955). Microfossils incertae sedis from the Upper Jurassic and Lower Cretaceous of Cuba. Micropaleontology. 1(28-51): -. gs

Covington, J. M. & Wise, S. W. (1987). Calcareous nannofossil biostratigraphy of a Lower Cretaceous deep-sea fan complex: Deep Sea Drilling Project Leg 93 Site 603, lower continental rise off Cape Hatteras. Initial Reports of the Deep Sea Drilling Project. 93: 617-660. gs V O

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

Sissingh, W. (1977). Biostratigraphy of Cretaceous calcareous nannoplankton. Geologie en Mijnbouw. 65(1): 37-65. gs


Nannoconus steinmannii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-1-2021

Taxon Search:
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Short stable page link: Go to to create a permanent copy of this page - citation notes

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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