(4Z)-4-Nonenal is a sex pheromone found in Male Tropical West African Shield Bug, Sphaerocoris annulus[1].
References
[1] A. J. E. Gough, et al. C9 Aliphatic Aldehydes: Possible Sex Pheromone from Male Tropical West African Shield Bug, Sphaerocoris annulus. 2014. Zeitschrift für Naturforschung C. 1073-1076.