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 | ||||
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:
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).
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:
![]() |
N. truitti group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-2-2019
Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10716 Go to Archive.is to create a permanent copy of this page - citation notes |