Nannotax3 - Mesozoic - N. truitti group

N. truitti group

Classification: Mesozoic -> Braarudosphaerales -> Nannoconaceae -> Nannoconus -> N. truitti 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: Cylindrical, barrel-shaped or slightly tapering nannoconids with moderately wide central canals (ct ≈ wt).

Daughter taxa: (blue => in age window 0-800Ma)		Granddaughter taxa
	Nannoconus cornuta Quadriangular with horns and bosses on the outer wall.
	Nannoconus donnatensis Quadriangular (height = width) with slightly concave outer walls
	Nannoconus elongatus Tall and cylindrical (height ~2x width).	N. elongatus subsp. cylindrus N. elongatus subsp. elongatus
	Nannoconus inconspicuus Small (height 2 microns, width 3.5 µm), short (width>height) and cylindrical.
	Nannoconus longus Tall (at least twice as tall as wide) with parallel sides and slightly bulbous base.
	Nannoconus minutus Relatively small (type material diameter 5.0-6.5 µm), cylindrical and moderately tall (height = width).
	Nannoconus multicadus Tall (height 10.5-20.0 µm), elongate and cylindrical with one or two constrictions.
	Nannoconus planus Tall, quadriangular nannoconid with cavity similar in width to the wall.
	Nannoconus quadriangulus quadriangular (height = width).	N. quadriangulus subsp. apertus N. quadriangulus subsp. quadriangulus
	Nannoconus quadricanalis large, quadriangular to elongate (similar height and width).
	Nannoconus truittii Barrel-shaped or slightly tapering	N. truittii subsp. frequens N. truittii subsp. rectangularis N. truittii subsp. truittii

Taxonomy:

Citation: N. truitti group

Rank: species group

Notes & discussion: informal grouping first used here

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

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

Search data:

Tags	LITHS: nannolith-radiate, circular, cylindrical, hollow, CA: vacant, T-UNITS: T-prominent,
Metrics	Lith size: 2->25µm; Sources: size range of included species

The morphological data given here can be used on the advanced search page. See also these notes

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 Valanginian Stage (0% up, 139.4Ma, in Valanginian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Neptune data: this is a higher taxon page so Neptune data is not plotted. For the customisable plot option go to a genus page Parent: Nannoconus