Leuctra tenuis

Leuctra tenuis (Pictet, 1841) Notes Leuctra tenuis is commonly referred to as the Narrow-Lobed Needlefly (Stark et al. 2012). This species is distributed extensively across eastern North America, except for the USA Gulf Coastal region, and west to Oklahoma (Grubbs 2015, DeWalt et al. 2024). Leuctra tenuis has been associated with larger streams and rivers throughout Quebec and Ontario (Harper and Hynes 1971 a). Masteller (1983) reported peak emergence of L. tenuis in July from a stream in Pennsylvania. Adults of this species are active from mid-May through late September (Fig. 13). Leuctra tenuis has been reported from a wide range of elevations from 72-1620 m asl (Fig. 14) and is common and abundant throughout the state (Fig. 16 c).