From Dave Funk, entomologist at the Stroud Center (https://stroudcenter.org/people/funk/): “I’d be very surprised if there were any among the EPT’s–no structures I am aware of that might suggest either a source or sensor. It seems to me the most likely place to find sound communication in aquatic insects would be among (non-benthic) adult beetles or true bugs in still waters, e.g., dytiscids, hydrophilids, corixids, etc…”