Synagapetus dubitans is a caddisfly (Trichoptera) species from the family Glossosomatidae and part of the genus Synagapetus. The species had been recorded in a number of central European countries including France, Switzerland, Belgium and Italy but not from Britain.
However, on the 4th of September 2010, I collected a single adult male from a small calcareous spring stream flowing through a wood near Masham in the county of North Yorkshire. On a return trip, on the 28th of October, I found a female at almost exactly the same place. Since those initial findings of 2010 and through until the end of 2019 I have continued to study this insect species to try and learn more of its distribution here in Yorkshire, the habitat where it is found and its identification. On the question of identification I wanted to understand the larval stage (except the tiny very early instar stages which are still unknown to me), the pupa stage and the adult stage (both males and females).