This is a good book on these bugs , good reference tool for fly fishers and fly-tiers ---MAYFLIES: AN ANGLER'S STUDY OF TROUT WATER EPHEMEROPTERA----by Malcolm and Robert Cormier Knopp. --Be safe
Relaxed and now a Full Time Trout Bum, Est. 2024
These were the ones I meant to post/
https://flic.kr/p/2oFVVqx