Lejeunecysta magnifica (Stanley, 1965, p.218–219, pl.20, figs.1–6) Artzner and Dörhöfer, 1978, p.1381.

Now Phelodinium. Originally Deflandrea, subsequently Senegalinium, thirdly Lejeunecysta, fourthly (and now) Phelodinium. See also Lejeunia (combination illegitimate).
Taxonomic junior synonym (at specific rank): Peridinium crassipes forma altum, according to Sarjeant (1985b, p.159) and Lentin and Williams (1993, p.503).

Holotype: Stanley, 1965, pl.20, figs.4-6
Locus typicus: S Dakota, U.S.A.
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.