Wetzeliella parva Alberti, 1961, p.8–9, pl.1, figs.14–18; pl.12, figs.10–11. Emendation: Harland, 1979c, p.65–66, as Apectodinium parvum.

Now Apectodinium. Originally Wetzeliella subgenus Wetzeliella, subsequently Wetzeliella subgenus Apectodinium, thirdly (and now) Apectodinium.
Holotype: Alberti, 1961, pl.1, figs.14-18; pl.12, figs.10-12
Locus typicus: Hildesheim, Germany
Stratum typicum: Eocene
Translation Alberti, 1961: LPP
Translation Gocht, 1969: Geological Survey of Canada

Original diagnosis: Alberti, 1961, p. 8: Wetzeliella (Wetzeliella) parva
Shell flattened, outline pentagonal, sometimes slightly rounded. Lateral horns rarely indicated. Apical horn short, usually outstanding. Two +/- long antapical horns. No transverse furrow. A to the outer margin of the shell closely appressed delicate inner body usually present. Shell densly covered by +/- long spines. Epitheca acute to retangular. Hypotheca wide with two antapical horns of unequal length. These horns . which are equivalent to the apical horns can diverge or converge.
On several studied forms misses the inner body or is because of the dense cover of spines not visible. The spines can by fused at their bases.

Affinities: Alberti, 1961, p.8: Wetzeliella (Wetzeliella) parva
W. parva differs from H. geometricum in the elongated pentagonal outline and the small, +/- outstanding horn.

Gocht, 1969, p.16:
The single specimen is very well preserved. Its outline corresponds well with Alberti"s finds. Also the chronological determination matches (according to Alberti, Late Paleocene to Early Eocene). The body is somewhat larger than Alberti"s specimens. On the outer membrane there seems to be some indication of a transverse furrow. The inner body only appears to be absent, as its boundary is not visible: At the damaged apical portion, the edges of the membrane reveal that a capsule is present. However- as also in Alberti"s material- no archeopyle appears.
Occurrence: Early Eocene.