... These organs have likely evolved for prey detection, as most spiders use vibration in the predation processdeither through silk threads on webs or through environmental surfaces such as leaves, plant stems, and even water surfaces (Barth, 1982(Barth, , 1985(Barth, , 2002Hergenroder & Barth, 1983;Hoffmaster, 1982;Klarner & Barth, 1982;Landolfa & Barth, 1996;Masters & Markl, 1981;Roland & Rovner, 1983). Perhaps as a consequence, vibratory communication is common in spiders (Virant-Doberlet, King, Polanjnar, & Symondson, 2011) taking the form of web-plucking, percussive sound production, substratum-coupled stridulation, or body vibration/tremulation, typically in the context of male courtship (Barth, 1993;Cocroft & Rodriguez, 2005;Hill, 2008Hill, , 2009Kronestedt, 1996;Maklakov, Bilde, & Lubin, 2003;Quirici & Costa, 2005;Rovner, 1967Rovner, , 1975Rovner, , 1980Rovner & Barth, 1981;Uetz & Stratton, 1982). Presumably, vibratory communication has evolved as a means of distinguishing vibrations of potential prey from conspecific mates (Barth, 1993(Barth, , 2002Vibert, Scott, & Gries, 2014;Virant-Doberlet et al., 2011), but it is also clear that in addition to species identity, vibratory signals may stimulate female arousal (Maklakov et al., 2003), reduce female aggression (Wignall & Herberstein, 2013a, 2013b, and contain information about male quality (Gibson & Uetz, 2012;. ...