Wetzeliella (Apectodinium) parva (Alberti 1961) Lentin and Williams 1977
Originally Wetzeliella subgenus Apectodinium, subsequently (and now) Apectodinium.

Holotype: Alberti, 1961, pl.1, figs.14-18; pl.12, figs.10-12
Locus typicus: Hildesheim, Germany
Strathm typicum: Lower Eocene, Tertiary
Translation Alberti, 1961: LPP

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 densely 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.