(A) Male reproductive system of a F. schrottkyi four day-old adult, (B–D) histology of testicular follicles: (B) detail of a cyst of a five day old adult, with the nuclear (n) and flagellar (f) regions identified; (C) nine day-old adult spermatozoa cysts, with the glycoprotein cap (open arrows) already formed; (D) degenerating follicle of a 12 day-old adult has free spermatozoa (z); note degenerative figures (asterisks). (dd) Pre vesicular deferent duct, (ed) ejaculatory duct, (ef) efferent duct, (fc) follicles, (pd) post vesicular deferent duct, (sv) seminal vesicle.