N. kamptneri group


Classification: Mesozoic -> Braarudosphaerales -> Nannoconaceae -> Nannoconus -> N. kamptneri group
Sister taxa: N. steinmannii group, N. kamptneri group, N. abundans group, N. truitti group, N. circularis group, N. compressus group, Nannoconus - atypical, N. sp.,

Distinguishing features: Pear-shaped and tapering nannoconids with wide central cavity (ct = 1-3 x wt).


Daughter taxa: (blue => in age window 0-800Ma) Granddaughter taxa
Concave walls, slightly wider at one end (similar height and width).

Tall (>10 microns), pear-shaped with bulbous base (height ~2x width).

Pear-shaped to tapering (height ~3x width or more) with bulbous basal cavity.

Squat, pear-shaped with bulbous basal cavity.

Broad, pear-shaped to tapering with similar height and width.

Tall (>10 µm) vase-shaped (height ~2x width).

Bulbous basal cavity.

N. dauvillieri - tall (>10 microns), cylindrical, widens at one end (height ~3x width).

N. kampneri variant, with asymmetric base?

Squat, barrel-shaped to globular (similar height and width).

Pear-shaped to tapering

Large, ovoid nannoconid with wide central cavity and coarse, high-angle wall cycles.

Tapering, slightly higher than wide

Broad, pear-shaped, slightly higher than wide with bulbous base.

Pear-shaped with bulbous base

Taxonomy:

Citation: N. kamptneri group
Rank: species group
Notes & discussion: informal grouping first used here

Farinacci & Howe catalog pages: N. kamptneri group [no catalog entry yet]

Distinguishing features: Pear-shaped and tapering nannoconids with wide central cavity (ct = 1-3 x wt).

Geological Range:
Last occurrence (top): at top of Campanian Stage (100% up, 72.1Ma, in Campanian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Tithonian Stage (0% up, 152.1Ma, in Tithonian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Casellato, C. E. (2010). Calcareous nannofossil biostratigraphy of Upper Callovian - Lower Berriasian successions from the Souhern Alps, North Italy. Rivista Italiana di Paleontologia e Stratigrafia. 116(3): 357-404. gs


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N. kamptneri group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-12-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10714 Go to Archive.is to create a permanent copy of this page - citation notes



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