A striking adaptation to a very dilute diet is found in many hemipterans : a filter chamber which permits nutrients to be separated from excess water .
A filter chamber is a part of the gut looped back on itself as a countercurrent exchanger .
A striking adaptation to a very dilute diet is found in many hemipterans : a filter chamber , a part of the gut looped back on itself as a countercurrent exchanger , which permits nutrients to be separated from excess water .