| The stonefly Protonemura risi new for the Netherlands (Plecoptera: Nemouridae) During a survey in the southernmost part of the province Limburg a stonefly new to the Netherlands was recorded: Protonemura risi (Jacobson & Bianchi, 1905). The species was observed in two spring brooks in June 2005. This was a surprising discovery, as stoneflies belong to the most endangered insect groups in the Netherlands. Nymphs and adults of P. risi are characterized by short neck gills. It is a stenotherm species and lives in springs and spring brooks in mountainous areas of central and northwestern Europe. The adults are active during the summer months. The populations in Limburg have surely been overlooked in the past, as the only old record of P. nitida... |
