Wetzeliella pilata Stanley, 1965

Now Spinidinium?. Originally Wetzeliella, subsequently Wetzeliella?, thirdly (and now) Spinidinium?.
Lentin and Williams, 1976, questionably included this species in Wetzeliella.
Holotype: Stanley, 1965, pl. 21, figs. 14-16
Locus typicus: South Dakota, USA
Stratum typicum: Paleocene

Original description: Stanley, 1965, p.222
Outer cyst more or less pyriform to rhomboidal in dorso-ventral view; length 42-49 µm width about 30 µm. Hypotheca smaller than epitheca. Outer cyst membrane thin, moderately folded; membrane ornamented with rodlike elements that usually have a small ball-like expansion on the distal end (pila); length of spines 1.5 to 3 µm. Apical horn about 5 µm long. Left antapical horn approximately 9 µm long whereas the right antapical horn is usually not developed. Girdle on the order of 5 µm wide and more or less distinct; furrow and archeopyle indistinct.

Affinities:
Stanley, 1965, p.222: Wetzeliella pilata, differs from W. rugosa, by having long sculpture elements that are expanded at their distal end.