overview (8)
Arkhangelskiales (2)
Eiffellithales (3)
Holococcoliths (26)
Nannoliths (10)
Podorhabdales (7)
Watznaueriales (1)
Helicosphaera mediterranea Muller, 1981
Description: Like H. ampliaperta but with central opening spanned by narrow conjunct bar.
Remarks:
Synonym: H. crouchii Bukry, 1981.
Neogene: Helicosphaera mediterranea