Leuctra triloba Claassen, 1923

Myers, Luke William, Kondratieff, Boris C, Grubbs, Scott A, Pett, Lindsey A, DeWalt, R. Edward, Mihuc, Timothy B & Hart, Lily Veronica, 2025, Distributional and species richness patterns of the stoneflies (Insecta, Plecoptera) in New York State, Biodiversity Data Journal 13, pp. e 158952-e 158952 : e158952-

Leuctra triloba Claassen, 1923

Notes

This species is commonly referred to as the Three-Lobed Needlefly ( Stark et al. 2012), and has been previously reported from Quebec and New York south to Alabama and Florida ( Grubbs 2015, DeWalt et al. 2024). Harper and Harper (1997) reported a fall emergence of this species, but no information is available on the habitat or microdistribution of this species. Our limited data from historical collections in New York indicate a similar emergence with dates ranging from mid-September through October (Fig. 13 ). Elevations for L. triloba in New York range from 125-340 m asl (Fig. 14 ). This species appears to be relatively uncommon at its northernmost range limits. A single record is available from southern Quebec ( Harper and Hynes 1971 a) and in New York State this species has not been recollected since its original description from the type locality in Ithaca and another nearby locality in the late 1800 ' s. Both state records reside in Level IV Ecoregion Finger Lakes Uplands and Gorges (60 d) (Fig. 16 d ). Less frequent collection efforts during autumn and early winter may account for the paucity of records from New York.

Figures

Figure 13. Adult flight period for 13 Leuctridae species in New York State. Red fill indicates positive adult collections while gray shaded areas indicate adults are likely present but not reported.

Figure 14. Elevation box plot for 13 Leuctrdae species in New York State. Boxes indicate interquartile range, horizontal line in box represents median elevation, and outliers are depicted with large circles.

Figure 16 d. Leuctra triloba