Sexual dimorphism salamander

Dawley, E. M., 1992, Sexual dimorphism in a chemosensory system the role of the vomeronasal organ in salamander reproductive behavior, Copeia 1992(1) 13-120. 

Fig. 7.2(a) Inter-sexual, direct scent transfer signal- injection , by scarification of female s skin. Male salamander transfers chin-gland secretion (inset) with dimorphic tooth-scraper (from Arnold, 1977). 

---