The family Psychidae is fairly small, with about 1,350 species. Another common name for the Psychidae is “case moths”, the names refer to the habits of caterpillars of these two families, which build small protective cases in which they can hide. The bagworms belong to the superfamily Tineoidea, which is a basal lineage of Gelechioidea, which includes case-bearers.
Most bagworms are inoffensive to humans and inconspicuous; some are occasional nuisance pests. However, a few species can become more serious pests, and have caused significant damage e.g. to wattle (Acacia mearnsii) in South Africa and orange (Citrus × sinensis) in Florida. If detected early, picking the cases from the trees while in their pupa stage is an effective way to check an infestation; otherwise, insecticides are used.
Source: Wikipedia
Subfamily Oiketicinae
(Pahang, Malaysia)