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Project Watershed Central New York

Dedicated to facilitating water resource education in Central New York

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Glossary		 OLTRDS

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Mayfly Nymph

Pollution-Intolerant
Mayfly Nymph
  • About 700 species in North America
  • Develop in the stream during period of two weeks to two years
  • Live on exposed rock surfaces in fast current or buried in soft stream beds
  • Large numbers of flying adults may emerge from stream at the same time
  • Platelike or feathery gills along the side of the abdomen
  • Two or three long hairlike tails
  • Six segmented legs on middle section of body
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