Abstract
The Jurassic or Cretaceous insect fossil site Chernovskie Kopi (Siberia, Transbaikalia) has yielded a rich and diverse insect fossil assemblage dominated by caddisflies (Order Trichoptera). Imaginal caddisflies from this site belong to the families Phryganeidae, Dysoneuridae, Philorheithridae, and Calamoceratidae, and the larval cases represent mainly the formal genus Folindusia. The family Philorheithridae is recorded as fossil for the first time. A combination of unusual ecology related to volcanic environments with unexpected abundance of the so-called prophetic larval forms (those occurring for short time intervals well before the time of their normal appearance) resulted in high endemism of the adult assemblage as well as in occurrence of the cases characteristic of much younger caddis case assemblages.