Another Callibaetis? - Acerpenna pygmaea

Moved

Moved from Mayflies.

Nice shot of a smaller baetid. The carina on the head is visible and the gills on the seventh abdominal segment are teardrop shaped instead of oval. The color pattern is pretty distinctive, too.

… Brady Richards, 20 February, 2014 - 9:42am

This mayfly stopped moving in

This mayfly stopped moving in mid-December; would that suggest diapause?

… Even Dankowicz, 20 February, 2014 - 11:12am

Stopped moving

Had you been keeping it alive? If the gills have stopped moving, the mayfly is likely dead. I can't think of any observations of diapause in mayfly nymphs. Eggs, yes. I have a colleague who has worked with stonefly eggs that will diapause. That way a single clutch of eggs can develop across several years/seasons.

… Brady Richards, 20 February, 2014 - 11:34am

Yes, it became unresponsive f

Yes, it became unresponsive for unknown reasons.

… Even Dankowicz, 20 February, 2014 - 12:54pm