Abstract
Nymphal development of Paraleptophlebia adoptiva (McDunnough) and Paraleptophlebia mollis (Eaton) was studied in the West and East branches of the Credit River, Peel County, Ontario. Nymphs of P. adoptiva were found only in the cooler water of the West branch; they continued to grow during winter months and had a short emergence period in mid-May. Paraleptophlebia mollis nymphs occurred in both branches, nymphs in the West branch being significantly smaller than those of the East. No growth was observed for P. mollis nymphs in winter and a protracted emergence period for this species throughout June was evident. Both mayfly species are univoltine.
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