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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Antennae usually relatively elongate and prominent, at least 6 times as long as wide (sf 19.96) | Antennae of normal length, not more than 3 times as long as wide (sf 19.107) or not apparent at all (sf 19.67) |
If antennae not as above (and often when they are), sclerotized plates on mesonotum are lightly pigmented except for pair of dark curved lines on posterior half (sf 19.97) | Mesonotum never with pair of dark curved lines as at left |
Larvae construct portable cases of various materials (many source figs) | |
Remaining families: Apataniidae, Beraeidae, Brachycentridae, Calamoceratidae, Dipseudopsidae, Glossosomatidae, Goeridae, Hydrobiosidae, Lepidostomatidae, Limnephilidae, Molannidae, Odontoceridae, Philopotamidae, Phryganeidae, Polycentropodidae, Psychomyiidae, Rhyacophilidae, Rossianidae, Sericostomatidae, Thremmatidae, Uenoidae, and Xiphocentronidae | |
1 Example Specimen | 5 Example Specimens |
Leptoceridae | Go to Couplet 6 |