Figure 2. Schematic view of the Y-shaped choice chamber used to test the detection of conspecifics by short-distance chemoreception in Armadillidium vulgare (I: initial position of tested individual, IIa and IIb : position of target individuals; NS: Neutral Section, IS: Intermediate Section, LS: Left Section, RS: Right section) with two plastic pipettes placed at the end of each tunnels and used to pulse air regularly into the system.