Powlowskys gland lubricating the mouth parts is found in

Powlowskys gland lubricating the mouth parts is found in Siphunculata.
Sucking lice (Anoplura, formerly known as Siphunculata) have around 500 species and represent the smaller of the two traditional superfamilies of lice.
The Anoplura are all blood-feeding ectoparasites of mammals. They only occur in about 20% of all placentalian mammal species and are unknown from several orders of mammals. They can cause localized skin irritations and are vectors of several blood-borne diseases.