Achipteria sgardelisi sp. nov. and its morphological ontogeny is described and illustrated. The adult of this species has a clavate bothridial seta, with a barbed head distally, which is not common in Achipteria Berlese, 1885; in most species the head is smooth. Notogastral setae c₂ and la are long, while the other setae are short, and rounded porose areas are present, of which Aa is the largest. Genua I and II lack anteroventral apophysis, genu IV is approximately as long as tibia IV, and setae bv″ and v″ on femur I and l′ on femur III are short. All prodorsal setae of juveniles are minute. Most gastronotal setae of larva are short, thick and barbed, except for minute c-series and smooth h₂, whereas most gastronotal setae of nymphs are minute, except for short, thick and barbed lp and h-series. Leg claws of all instars are smooth. The morphology of the adult and juveniles of A. sgardelisi is compared with congeners.