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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

Dorsal view of a Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from the Yakima River in Washington
Some characteristics from the microscope images for the tentative species id: The postero-lateral projections are found only on segment 9, not segment 8. Based on the key in Jacobus et al. (2014), it appears to key to Neoleptophlebia adoptiva or Neoleptophlebia heteronea, same as this specimen with pretty different abdominal markings. However, distinguishing between those calls for comparing the lengths of the second and third segment of the labial palp, and this one (like the other one) only seems to have two segments. So I'm stuck on them both. It's likely that the fact that they're immature nymphs stymies identification in some important way.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Damsel
Damsel's profile picture
Winter Park, CO

Posts: 1
Damsel on May 23, 2018May 23rd, 2018, 11:40 am EDT
How do you tell the difference ?
Taxon
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on May 26, 2018May 26th, 2018, 10:44 am EDT
Hi Cyndi-

Assuming your question relates to the winged lifestages, the most obvious characters that pertains to both sexes and both winged lifestages is that Baetis have oblong hind wings, whereas Callibaetis have more squarish hind wings, and Baetis have short antennae, whereas Callibaetis have longish antennae.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

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