jupal04s favoriter

Length ~6 mm.

Pitfall trap set for six nights (4 – 10 May) in suburban courtyard. Substrate: river stones over weedmat with minimal leaf litter from cultivated Veronica sp., which also provide dense canopy.
10+ mm rain fell between 8 and 10 May; otherwise weather was cool/mild and dry.

I have keyed this out with the NIWA freshwater isopod quick key but it is hard to do without a microscope. As this species hasn’t been observed on iNat, I may see if I can go back and get better photos and a more certain ID. I thought it would be A. benhami because the uropods appear to have a straight distal margin. There were many in this stream, and they appeared to be fully aquatic with this specimen on the underside of a rock