Short-wingedness in the stonefly Diura nanseni (Kempny) (Plecoptera: Perlodidae)

Abstract
Short-wingedness in adult Diura nanseni is extremely rare and only three short-winged males have been previously recorded. In a population from the Norwegian Jotunheimen Mountains half the males were micropterous in 1976, although normal-winged in subsequent years. The features of this population are described. Several hypotheses, including low temperatures during egg development, are proposed to explain this isolated example of short-wingedness.

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