(In the above photo -- an Isoperla holochlora "A" nymph, fairly mature.
Perlodid Stoneflies (Springflies and Stripetails [= the Isoperlas])
1. Clioperla clio. Size: 14-17 mm; Season: Late Fall through Winter.
immature:
fairly mature:
very mature:
2. Diploperla duplicata. Size: 11-14 mm; Season: Late Fall into Spring.
fairly mature:
very mature:
3. Helopicus subvarians. Size: 17-20 mm; Season: Winter into Spring.
immature:
mature:
4. Isogenoides hansoni. Size: 16-24 mm; Season: Fall into Spring.
6. Isoperla holochlora light form. Size: 11-14 mm; Season: Spring into Early Summer.
7. Isoperla holochlora dark form Size: 9-10 mm; Season: Winter and Spring.
immature:
immature:
mature:
8. Isoperla montana (kirchneri) group. Size: ~11 mm; Season: Winter and Spring.
fairly mature:
fairly mature:
9. Isoperla kirchneri (kirchneri group).
10. Isoperla similis. Size: 12-15 mm; Season: Winter into Spring.
mature:
12. Isoperla davisi
13. Isoperla orata
14. Isoperla orata (variant form).
immature:
mature:
15. Isoperla lata/pseudolata.
17. Remenus bilobatus. Size: < 10mm; Season: Spring.
immature:
fairly mature:
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