Updates from January 13, 2004

These three Isonychia nymphs show the variety within the species from a single day at a single collection site.

This very small, early instar specimen has some interesting markings, but it's too underdeveloped to identify.

I'm unsure which species this is: it lacks the usual features of B. laurentina, but it's small, so maybe it's just an underdeveloped early instar. Otherwise, it looks like it might be B. obesa.

I've only got blurry pictures of this small Baetisca nymph, because it was zooming around the container in a frenzy. Several characteristics, if taken literally, suggest that it may be Baetisca lacustris. However, it's very small and it's the only candidate lacustris I collected among several laurentina specimens, so it's possible this is just an underdeveloped early instar laurentina.