Weaponry, color, and contest success in the jumping spider Lyssomanes viridis

► Males having longer chelicerae than their opponents were more likely to win contests. ► Males who won, despite being smaller, had less red chelicerae than their opponents. ► Male and female cheliceral and foreleg lengths correlated tightly with body size. ► Chelicerae and forelegs showed stronger positive allometry in males than in females.