Genus Stylochus Ehrenberg, 1831

Diagnosis (modified by Bulnes et al. 2005). Coloration pattern consisting of reticulated darker spots or streaks; marginal, tentacular and cerebral eyes; present anterior tentacles; male reproductive system oriented towards the posterior or anterior of the male gonopore; free prostatic vesicle monoglandular or polyglandular type; simple seminal vesicle; female reproductive system with a simple and short vagina, absence of Lang’s vesicle.