Hystrichosphaeridium macrotubulum

"macrotubulum" Neale and Sarjeant, 1962, p.452–455, pl.20, fig.7; text-fig.8a.  Holotype: Neale and Sarjeant, 1962, pl.20, fig.7; text-fig.8a; Fauconnier and Masure, 2004, pl.57, fig.7.  Originally Hystrichosphaeridium, subsequently Oligosphaeridium, thirdly Oligosphaeridium?.  Taxonomic senior synonym: Hystrichosphaeridium (now Oligosphaeridium) vasiformum, according to McIntyre and Brideaux (1980, p.21).  Age: Hauterivian.

Parent: Hystrichosphaeridium