Hystrichosphaeridium macrotubulum
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"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