Spinidinium densispinatum
From dinoflaj3
densispinatum Stanley, 1965, p.226–227, pl.21, figs.1–5. Holotype: Stanley, 1965, pl.21, figs.1–3. Originally (and now) Spinidinium, subsequently Magallanesium. Taxonomic junior synonym: Spinidinium microceratum, according to Stone (1973, p.53–54). Sluijs et al. (2009, p.47) retained this species in Spinidinium. Age: Paleocene.