Senegalinium magnificum (Stanley, 1965) Harland, 1977

Now Phelodinium. Originally Deflandrea, subsequently Senegalinium, thirdly Lejeunecysta, fourthly (and now) Phelodinium; see also Lejeunia (combination illegitimate). Lentin and Williams, 1977 retained this species in Lejeunia Gerlach, 1961.
Tax. synonym of Peridinium cf. crassipes forma altum 0. Wetzel, 1933, according to Sarjeant, 1985. Senegalinium magnificum has priority at the species rank.

Holotype: Stanley, 1965, pl.20, figs.4-6
Locus typicus: South Dakota, USA
Stratum typicum: Paleocene

Original description: Stanley, 1965, p.218: Deflandrea magnifica
Outer cyst large, pentagonal in dorso-ventral view; length 120-135 µm overall; width 100-115 µm; outer cyst wall smooth to covered with small irregularly placed spines; wall thin and often longitudinally wrinkled. Apical horn 5-10 µm long; antapical horns about 5-10 µm in length with left horn slightly longer than the right one; antapical horns tend to slightly diverge from each other. Inner cyst completely fills the outer one. Girdle well developed, width about 8 µm. Furrow about 15 µm wide and is bordered by a more or less frilled border. Archeopyle six-sided with posterior side considerably longer than the anterior one.

Affinities:
Stanley, 1965, p.219: Deflandrea magnifica
Deflandrea magnifica is differentiated from D. pannucea by its distinctly larger size and its shorter antapical horn.