More often, the Hydroptilidae are placed in a monotypic superfamily Hydroptiloidea, either in the Spicipalpia or – probably more appropriately considering the present state of caddisfly phylogeny – incertae sedis in the Trichoptera. It may be that the Glossosomatoidea are particularly closely related to the Hydroptilidae; together they might even be closer to the most advanced caddisflies (the tube case caddisflies, Integripalpia) than any other living caddisfly.
The Hydroptilidae are often classified in a monotypic superfamily Hydroptiloidea, either within the Spicipalpia or – more appropriately considering current caddisfly phylogenetic research – placed in incertae sedis within the Trichoptera. It is possible that the Glossosomatoidea are closely related to the Hydroptilidae; together they might be even closer to the most advanced caddisflies (the tube case caddisflies, Integripalpia) than any other living caddisfly.