Updates from February 4, 2004

This large midge larva is about 3/4" long.

I think this one might be Leptophlebia intermedia.

Examination of this specimen under a microscope revealed that it does have small abdominal tubercles, 2-banded femora, and banded tails.

This specimen seems to be morphologically identical to the darker specimens of its species, but it's a very distinctly different color. I'm guessing this is a gender difference, just as I've guessed for the similar E. subvaria nymphs.

Close examination under a microscope showed definite small tubercles on the back of this nymph.

This Baetis nymph is quite a bit larger than any of the others I found in winter 2004. Abdomen segment 5 is only slightly pale while 9 and 10 are quite pale. The tail is banded at the tip. Its body measures about 9mm long. It's much larger than the other Baetis specimens I collected, and it has quite well-developed wingpads. It's most likely a mature nymph from a very early-hatching brood. It comes from the headwaters of a very small, very spring-fed Lake Superior tributary, which wasn't at all frozen despite very frigid temperatures and 3 feet of snow on the ground.

This one is missing several gills due to capture damage.

This little Baetid looks a little stiff because it died shortly before being photographed.

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.