overview (8)
Arkhangelskiales (2)
Eiffellithales (3)
Holococcoliths (26)
Nannoliths (10)
Podorhabdales (7)
Watznaueriales (1)
Zygodiscaceae Hay and Mohler, 1967
Description: Muroliths with rim formed from well-developed V- and variably developed R-units, with opposite imbrication directions, and central area structures that include disjunct transverse bars (Zygodiscus, Lophodolithus) and diagonal crosses (Neochiastozygus, Neococcolithes, Chiphragmalithus). R-units vestigial or not observed in several genera (Chiphragmalithus, Ismolithus, Neococcolithes).
Remarks:
Paleogene: Zygodiscaceae