|Daughter taxa (time control age-window is: 0-800Ma)|
Medium-sized species (H ca 7 µm, W ca 9 µm) with flat cylindrical outline, consisting of 20 to 30 wedges with a smooth outer surface and a large and deep distal depression with central body.
Large, cylindrical fasciculith that narrows sharply around half way up the column, forming a shoulder.
Distinguishing features: Fasciculiths formed of a single cycle, arguably with central body, deep cavity on one side, no fenestrae
Farinacci & Howe catalog pages: Gomphiolithus *
Phylogenetic relations: These are the ancestral fasciculiths according to Romein (1979) and separating them, as reccomended by Aubry et al. (2011), makes sense phylogenetically, if Fascilulithus (sensu stricto) evolved from Lithoptychius rather than from Gompholithus.
|Tags||LITHS: nannolith-radiate, circular, cylindrical, CROSS-POLARS: R-prominent,|
|Metrics||Lith size: 6->10µm;|
Notes: Romein (1979), Perch-Nielsen (1985), Steurbaut & Sztrakos (2008), & Monechi et al. (2013) all give these species a similar restricted range in lower NP4
Last occurrence (top): in upper part of Danian Stage (75% up, 62.7Ma, in Danian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Danian Stage (69% up, 63Ma, in Danian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=629 Go to Archive.is to create a permanent copy of this page - citation notes