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This relatively large early March Baetid nymph has untracheated gills and no bands on its tails.

This specimen has indistinct gill veinlets, a rounded seventh gill, and no bands on the tails.

This nymph has only two real tails. The third is present, but too short to see in these pictures. It has particularly small gills and indistinct gill veinlets.

This nymph has gills with indistinct veinlets, segments 5, 9, and 10 pale, a rounded 7th gill, and a very short middle tail.

Close examination under a microscope revealed that this Baetid nymph has segment 5 pale, segments 8, 9, and 10 pale but less so, a middle tail almost as long as the outer tails, conspicuous gill veinlets, no bands on its tails, and pointed, slender 7th gills.

This Baetid nymph has no tracheation on its gills, no distinct bands on its tails, and a rounded, oval 7th gill. Abdominal segments 5, 9, and 10 are pale.

This is the only Baetis nymph I found in my January 31st (read: not sane) sampling in 2004. I looked at this one under my small microscope and wrote down some useful identification features which aren't really visible in the pictures from my camera. This nymph had conspicuous gill veinlets, a pointed, slender 7th gill, tail bands on the middle and tip, and abdominal segments 5, 9, and 10 are definitely pale, with segment 8 in-between, debatably pale.