The Hydroptilidae are a large family of caddisflies (Trichoptera) with a worldwide distribution. They are commonly known as microcaddisflies or purse-case caddisflies, in reference to two characteristic traits of this family: Hydroptilidae are much smaller than other caddisflies, rarely exceeding 5 mm (0.20 in) in length. Their larvae do not build a protective case until the final instar of their growth. At that time however, they build a typically Purse-shaped case, either portable or stuck to the substrate, in which the larva finishes growth and pupates.
The Polycentropodidae are a family of trumpet-net and tube-making caddisflies. There are at least 30 genera and 720 described species in Polycentropodidae. The type genus for Polycentropodidae is Polycentropus J. Curtis, 1835.
The Psychomyiidae are a family of tube-making caddisflies. Members of this family are typically very similar to polycentropodids, most of them can be differentiated by the spur formula is 2-4-4, thyridial cell short, absence of the forewing fork I, and hindwing forks I and IV. Male genitalia has elongate preanal appendages, and reduced tergum IX. The larvae differ by the submental sclerites separated, foretrochantin broad, and the pupal mandible apex whip-like. Larvae construct long silken galleries.
Pseudostenophylax is a genus of northern caddisflies in the family Limnephilidae. There are at least 80 described species in Pseudostenophylax.
Mystacides is a genus of long-horned caddisflies in the family Leptoceridae. There are more than 20 described species in Mystacides.
Dicosmoecinae is a subfamily of northern caddisflies in the family Limnephilidae. There are about 19 genera and at least 80 described species in Dicosmoecinae.
Hydroptilinae is a subfamily of microcaddisflies in the family Hydroptilidae. There are at least 60 genera and 1,600 described species in Hydroptilinae.
Anisocentropus is a genus of caddisflies in the family Calamoceratidae. There are more than 60 described species in Anisocentropus.
Marilia is a genus of mortarjoint casemakers in the family Odontoceridae. There are at least 40 described species in Marilia.
