Oligosphaeridium macrotubulum

"?macrotubulum" (Neale and Sarjeant, 1962, p.452–455, pl.20, fig.7; text-fig.8a) Davey and Williams, 1966b, p.75.  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 (as Oligosphaeridium) vasiformum, according to McIntyre and Brideaux (1980, p.21).  Questionable assignment: Stover and Evitt (1978, p.68–69).  Age: Hauterivian.

Parent: Oligosphaeridium