Hystrichosphaeridium tribrachiosum
From dinoflaj3
"tribrachiosum" Tasch in Tasch et al., 1964, p.195, pl.1, fig.3. Holotype: Tasch et al., 1964, pl.1, fig.3. Originally Hystrichosphaeridium, subsequently Polysphaeridium?. Taxonomic senior synonym: Hystrichosphaeridium (now Kiokansium) unituberculatum, according to Stover and Evitt (1978, p.267). Age: Albian.
Parent: Hystrichosphaeridium