Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
Option 1 | Option 2 |
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Most gills with 2 or 3 branches, none with more than 4 | At least some gills with more than 4 branches |
Remaining genera: Allocosmoecus, Amphicosmoecus, Anabolia, Arctopora, Asynarchus, Clistoronia, Dicosmoecus, Eocosmoecus, Frenesia, Glyphopsyche, Grammotaulius, Halesochila, Limnephilus, Nemotaulius, Onocosmoecus, Philarctus, Platycentropus, and Sphagnophylax | Remaining genera: Crenophylax, Hesperophylax, Ironoquia, Lenarchus, and Psychoronia |
5 Example Specimens | 1 Example SpecimenBased on both range maps and key characteristics, this larva is either Hesperophylax designatus, Hesperophylax alaskensis, or Hesperophylax occidentalis. However, the species key in Parker & Wiggins (1985) cannot separate these species as larvae.
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Go to Couplet 19 | Go to Couplet 40 |