Struktur und Entstehung der Larven- und Puppengehäuse einiger Glossosomatidae und Rhyacophilidae, insbesondere bei Synagapetus iridipennis (Trichoptera: Rhyacophiloidea)
Bohle, Hans-Wilhelm; Fischer, Monika
The construction of new cases by the larvae of Synagapetus iridipennis McLachlan 1879 is described: Normally the new case is built as an annex to the case that was in use previously. When the new one reaches at least half of its definitive length the silky junctions between the old and the new part are cut, and the new building is accomplished. The mode of construction is used in connection with permanent and temporary houses and for the pupal case (ie the outer cocoon), too. - The structure of the larval and the pupal case of S.iridipennis is compared with larval and pupal cases of Agapetus fuscipes (Curtis 1834), Glossosoma conform is (Neboiss 1963), and Rhyacophila nubila (Zetterstedt 1840). - The results are discussed: The similarities between all types of cases investigated lead to the hypothesis that the larval cases of Glossosomatidae can be derived from the pupal case of Rhyacophilidae. However, the larval cases of the Limnephiloidea should be of different origin.