Pentoperculum minimus was named by Manchester (1994) [Fruit stones rounded-pentangular in transverse view, lenticular to obtrullate in lateral view, 5–7.2 mm equatorial diameter, ~3–7 mm high. Fruit connsisting of 5 radially arranged single-seeded locules alternating with rounded lacunae. Each locule capped by an elliptical, longitudinally bipartite germination valve. Fruit surface usually smooth on the facets separated by ridges defining the pentagonal outline, sometimes with ten depressions visible on the lateral margins of the stone (pl. 3c, d) below the equator both aligned with, and alternating with, the five apical valves.]. It is not extant.