I want to know the answer to the following question:
Rove beetle Stenus emit what type of gland secretions?
All the background I'm provided with is that "Other insects such as the Rove beetle Stenus are known to emit pygidial gland secretions that reduce surface tension making it possible for them to move on the surface of water by Marangoni propulsion (also known by the German term Entspannungsschwimmen).". Is that enough to answer the question?