overview (8)
Arkhangelskiales (2)
Eiffellithales (3)
Holococcoliths (26)
Nannoliths (10)
Podorhabdales (7)
Watznaueriales (1)
Description: Polygonal, medium-sized, non-birefringent holococcolith with a narrow rim spanned by diagonal cross-bars. The rim is coffin-shaped (like a diamond with flattened ends) and usually shows small marginal projections.
Remarks: Similar to Orthozygus brytika but with geometric outline and lateral rim spines.
Range: NP15b-c.
Holotype: Paratype:
Paleogene: Youngilithus arcaeformis