Description of the last-instar larva and pupa and the bionomics of Smicridea (Smicridea) truncata Flint (Trichoptera: Hydropsychidae) in Central Amazonia, Brazil

The larva and pupa of Smicridea (Smicridea) truncata Flint 1974 (Trichoptera: Hydropsychidae) are described and illustrated. Larvae of S. truncata can be distinguished by the concave line on the median region of the frontoclypeus and presence of the tubular structures, located in the dorsolateral region of abdominal segment VIII, which were not observed in any of the described larvae of S. (Smicridea). This species was collected in a small wooden water trough at the Aruanã Farm, Itacoatiara municipality, and in four streams in Presidente Figueiredo municipality in the state of Amazonas, Brazil.

The larval diet was determined by stomach-content analysis; this caddisfly species feeds mainly on algae and diatoms.