Description of the pupa of Cyrnellus fraternus (Trichoptera: Polycentropodidae), with notes on variation in pupal case construction

The pupa of Cyrnellus fraternus is described for the first time, from the Elm Fork of the Trinity River, Texas. Study of this species in the Elm Fork has shown two distinct pupal case morphologies. These cases are described from field-collected and reared material