Sphenoderia vanhoyei Chardez, 1976

Diagnosis: Shell oviform, slightly compressed, flattening towards the anterior part to form a narrow slit pseudo-stome, made up of two lips of extremely thin and very barely visible chitin. Shell made up of large, few oval scales, these scales are very regular, they overlap at their edges.

Dimensions: Length 24-25.5 µm; width 16-17 µm.

Habitat: unknown