N. truitti group


Ancestry: Mesozoic -> Nannoliths -> Nannoconaceae -> Nannoconus -> N. truitti group
Sister taxa: N. steinmannii group, N. kamptneri group, N. abundans group, N. truitti group, N. circularis group, N. infans group, Nannoconus - atypical, N. sp.,

Short diagnosis: Cylindrical, barrel-shaped or slightly tapering nannoconids with moderately wide central canals (ct ≈ wt).


Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
Quadriangular with horns and bosses on the outer wall.

Quadriangular (height = width) with slightly concave outer walls

Tall and cylindrical (height ~2x width).

Small (height 2 microns, width 3.5 µm), short (width>height) and cylindrical.

Tall (at least twice as tall as wide) with parallel sides and slightly bulbous base.

Relatively small (type material diameter 5.0-6.5 µm), cylindrical and moderately tall (height = width).

Tall (height 10.5-20.0 µm), elongate and cylindrical with one or two constrictions.

Tall, quadriangular nannoconid with cavity similar in width to the wall.

quadriangular (height = width).

large, quadriangular to elongate (similar height and width).

Barrel-shaped or slightly tapering

Taxonomy:

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

Farinacci & Howe catalog pages:

Short diagnosis: Cylindrical, barrel-shaped or slightly tapering nannoconids with moderately wide central canals (ct ≈ wt).

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 Valanginian Stage (133.88-139.39Ma, base in Valanginian stage). Data source: Total of range of species in this database

Plot of occurrence data:


Nannotax3 - Mesozoic - N. truitti group by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-3-2017

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maryam (Iran)
Hi pro, Thank you very much for answer to my questions and guide me and Help me With the new Pictures. Good luck.
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