WAgrypnia is a genus of giant casemakers in the family Phryganeidae. There are about 19 described species in Agrypnia.
WAllotrichia is a genus of insect belonging to the family Hydroptilidae.
WAnabolia is a genus of northern caddisflies in the family Limnephilidae. There are about 18 described species in Anabolia.
WAnisocentropus is a genus of caddisflies in the family Calamoceratidae. There are more than 60 described species in Anisocentropus.
WAnnitella is a genus of caddisflies belonging to the family Limnephilidae. It was introduced by Czech entomologist František Klapálek in 1907 and named for his wife Anně.
WApatania is a genus of caddisflies in the family Apataniidae. There are at least 90 described species in Apatania.
WArctopsyche is a genus of netspinning caddisflies in the family Hydropsychidae. There are more than 20 described species in Arctopsyche.
WBeraea is a genus of insects in the family Beraeidae.
WBrachycentrus is a genus of humpless casemaker caddisflies in the family Brachycentridae. There are at least 30 described species in Brachycentrus.
WCeraclea is a genus of long-horned caddisflies in the family Leptoceridae. There are more than 140 described species in Ceraclea.
WChaetopteryx is a genus of insects belonging to the family Limnephilidae.
WCheumatopsyche is a genus of netspinning caddisflies in the family Hydropsychidae. There are at least 240 described species in Cheumatopsyche.
WChimarra is a genus of little black caddisflies in the family Philopotamidae. There are more than 630 described species in Chimarra.
WDiplectrona is a genus of netspinning caddisflies in the family Hydropsychidae. There are more than 100 described species in Diplectrona.
WEdpercivalia is a genus of insects known as caddisflies in the family Hydrobiosidae. This genus is endemic to New Zealand. The genus contains the following species:Edpercivalia banksiensis Edpercivalia borealis Edpercivalia cassicola Edpercivalia dugdalei Edpercivalia flintorum Edpercivalia fusca Edpercivalia harrisoni Edpercivalia maxima Edpercivalia morrisi Edpercivalia oriens Edpercivalia schistaria Edpercivalia shandi Edpercivalia smithi Edpercivalia spaini Edpercivalia tahatika Edpercivalia thomasoni
WFabria is a genus of giant casemakers in the caddisfly family Phryganeidae. There is one described species in Fabria, Fabria inornata. They are found in the United States and Canada.
WFrenesia is a genus of northern caddisflies in the family Limnephilidae. There are at least two described species in Frenesia.
WGlyphopsyche is a genus of northern caddisflies in the family Limnephilidae. There are at least three described species in Glyphopsyche.
WGlyphotaelius is a genus of insect belonging to the family Limnephilidae.
WGoera is a genus of caddisflies in the family Goeridae. There are at least 120 described species in Goera.
WGrammotaulius is a genus of caddisflies belonging to the family Limnephilidae.
WHalesus is a genus of caddisflies belonging to the family Limnephilidae.
WHelicopsyche is a genus of Trichoptera, the caddisflies. Helicopsyche contains more than 230 species and are represented on all major faunal regions with highest diversity in tropical and sub-tropical regions. The genus was first described by Siebold, 1856.
WHesperophylax is a genus of northern caddisflies in the family Limnephilidae. There are about seven described species in Hesperophylax.
WHolocentropus is a genus of tube maker caddisflies in the family Polycentropodidae. There are more than 40 described species in Holocentropus.
WHydatophylax is a genus of northern caddisflies in the family Limnephilidae. There are about 14 described species in Hydatophylax.
WHydropsyche is a genus of netspinning caddisflies in the family Hydropsychidae. There are at least 260 described species in Hydropsyche.
WIronoquia is a genus of northern caddisflies in the family Limnephilidae. There are about seven described species in Ironoquia.
WLepidostoma is a genus of bizarre caddisflies in the family Lepidostomatidae. There are more than 150 described species in Lepidostoma.
WLeptocerus is a genus of long-horned caddisflies in the family Leptoceridae. There are more than 140 described species in Leptocerus.
WLimnephilus is a genus of caddisflies in the family Limnephilidae. There are over 180 species of Limnephilus, described between 1824 and 1999.
WLype is a genus of net tube caddisflies in the family Psychomyiidae. There are more than 20 described species in Lype.
WMacrostemum is a genus of netspinning caddisflies in the family Hydropsychidae. There are at least 90 described species in Macrostemum.
WMicrasema is a genus of humpless casemaker caddisflies in the family Brachycentridae. There are more than 70 described species in Micrasema.
WMolanna is a genus of hood casemakers in the family Molannidae. There are more than 20 described species in Molanna.
WMystacides is a genus of long-horned caddisflies in the family Leptoceridae. There are more than 20 described species in Mystacides.
WNectopsyche is a genus of white millers in the family Leptoceridae. There are at least 60 described species in Nectopsyche.
WNeophylax is a genus of autumn mottled sedges in the family Thremmatidae. There are more than 30 described species in Neophylax.
WNeureclipsis is a genus of tube maker caddisflies in the family Polycentropodidae. There are at least 8 described species in Neureclipsis.
WOecetis is a genus of long-horned caddisflies in the family Leptoceridae. There are at least 410 described species in Oecetis.
WOligostomis is a genus of giant casemakers in the family Phryganeidae. There are at least four described species in Oligostomis.
WPhylocentropus is a genus of caddisflies in the family Dipseudopsidae. There are about 17 described species in Phylocentropus.
WPlectrocnemia is a genus of tube maker caddisflies in the family Polycentropodidae. There are more than 120 described species in Plectrocnemia.
WPolycentropus is a genus of tube maker caddisflies in the family Polycentropodidae. There are more than 190 described species in Polycentropus.
WPotamophylax is a genus of insects belonging to the family Limnephilidae.
WPseudostenophylax is a genus of northern caddisflies in the family Limnephilidae. There are at least 80 described species in Pseudostenophylax.
WPsychoglypha is a genus of northern caddisflies in the family Limnephilidae. There are about 14 described species in Psychoglypha.
WPtilostomis is a genus of giant casemakers in the family Phryganeidae. There are at least four described species in Ptilostomis.
WPycnopsyche is a genus of northern caddisflies in the family Limnephilidae. There are about 17 described species in Pycnopsyche.
WRhyacophila is a genus of caddisflies in the family Rhyacophilidae. There are at least 640 described species in Rhyacophila.
WSericostoma is a genus of bushtailed caddisflies in the family Sericostomatidae. There are at least 20 described species in Sericostoma.
WSetodes is a genus of long-horned caddisflies in the family Leptoceridae. There are at least 230 described species in Setodes.
WSilo is a genus of caddisflies in the family Goeridae. There are about 11 described species in Silo.
WTinodes is a genus of caddisflies belonging to the family Psychomyiidae.
WTriaenodes is a genus of long-horned caddisflies in the family Leptoceridae. There are at least 170 described species in Triaenodes.
WTrichostegia is a genus of insects belonging to the family Phryganeidae.
WWormaldia is a genus of fingernet caddisflies in the family Philopotamidae. There are more than 140 described species in Wormaldia. Fossil species have been described from the Late Cretaceous Burmese amber of Myanmar.