ABSTRACT
The sponges do not seem to show any permanent damage from the relationship, although the Sisyra larvae have often been referred to as parasites. This is based on the assumption that the insects feed on the cells of the sponges. The family Spongillidae encompasses freshwater sponges, which are supported by spicules of silica. The genus Sisyra is known from most parts of the world with suitable habitats for freshwater sponges. The lack of research on the spongillaflies is evident when the nature of the relationship between the sponge and the insect is considered. The larvae of many species of spongillafly have never been identified, and there is little information even about the habits of those species that have been found and studied. It is likely that there are many variations in the ecological niches occupied by these still unknown larvae and that their host species are different.
