The morphological ontogeny of Minunthozetes pseudofusiger (Schweizer, 1922) is described and illustrated. The juveniles of this species have a humeral organ and a gastronotal shield which bears four pairs of setae in the larva (dm, dp, lp, h₁) and 10 pairs in the nymphs (d-, l-, h-series, p₁). The larva has 12 pairs of gastronotal setae, including h₃, whereas the nymphs have 15 pairs. Setae of c-series are inserted on unsclerotized integument in all juveniles. Solenidion ω₂ on tarsus I is longer than ω₁ and situated anteriorly to ω₁ in the nymphs and adult stage, as in most species of Melanozetes Hull, 1916.