Aquatic Insects of Michigan
by Ethan Bright, Museum of Zoology Insect Division and School of Natural Resources and Environment
University of Michigan
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- Keys/Identification
- Aquatic Insects of Michigan
Leuctridae - Needleflies
Adults
(adapted from Hitchcock 1974)
| 1a | a. Supraanal process behind Ab10 tergite | Males, 2 |
| b. Posterior margin of Ab8 sternum straight | ||
| 1b | a. Supraanal process absent | Females, 5 |
| b. Posterior margin of Ab8 sternum posteriorly produced as a subgenital plate | ||
| 2a(1a) | Ab7-8 tergites with processes barely raised or absent | Leuctra ferruginea (Walker)(in part) |
| 2b | Ab7 or Ab8 with a process | 3 |
| 3a(2b) | Ab7 tergum only with a process | 4 |
| 3b | Ab8 tergum only with a process | 5 |
| 4a(3a) | Ab7 tergal process reaching out over the anterior margin of Ab8 tergum | Leuctra tenuis (Pictet) |
| 4b | Ab7 tergal process not reaching more than halfway across Ab7 tergite | Leuctra tenella Provancher |
| 5a(1b) | ||
Mature nymphs
(adapted from Harper and Hynes 1971)
| 1a | Whorls of bristles on cercal segments bushy | Leuctra sibleyi Claassen |
| 1b | Whorls with fewer bristles | 2 |
| 2a(1b) | In lateral view, only Ab3-4 tergites with short stout bristles along the dorsal margin | Leuctra tenella Provancher |
| 2b | In lateral view, all abdominal tergites covered with short stout bristles along the dorsal margin | 3 |
| 3a(2b) | No stout bristles on the abdominal sternites, although a few long bristles are on the posterior margins of the last abdominal segments | Leuctra ferruginea (Walker) |
| 3b | Short and stout bristles numerous on Ab9 sternite, a few additional scattered bristles may be present on preceeding segments | Leuctra tenuis (Pictet) |
References
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Harper PP, Hynes HBN. 1971. The Leuctridae of Eastern Canada (Insecta; Plecoptera). Canadian Journal of Zoology 49:915-920.
Page created: September 29, 2006; Last edited: November 7, 2013 (EB)