Microdinium spinosum

"spinosum" Brideaux and McIntyre, 1975, p.23-24, pl.6, figs.3-5.  Holotype: Brideaux and McIntyre, 1975, pl.6, figs.3-4.  Taxonomic senior synonym: Microdinium (as Phanerodinium) opacum, according to Below (1987b, p.38).  Age: Mid Albian.

Parent: Microdinium