Seasonal morphology and history of the androgenic gland of the crayfish, Orconectes nais.
D000818:Animals; D003445:Crustacea / Q000033:anatomy & histology*; D004702:Endocrine Glands / Q000033:anatomy & histology*; D008297:Male; D008675:Metamorphosis, Biological; D012621:Seasons; D013094:Spermatozoa; D013737:Testis / Q000502:physiology