The mysidSiriella armataprovides a new biological model for investigations on the molting and reproductive physiology in crustaceans. The main endocrine centres (Y-organ, mandibular organ, androgenic gland, X-organ and sinus gland) have been described and are available for experimentation. Experimental cautery of Medulla Interna-Medulla Externa-X-organ-sinus gland complex (MI-ME-X-organ-SG) of the eyestalk inhibited molt and brood production demonstrating that the complex plays a role in regulation, at leastviaa positive action upon the circulating ecdysteroids. In the present paper, the results already obtained are reviewed and the perspectives offered by this biological model discussed in reference to other crustaceans.