Abstract
The testis makes its appearance as a discrete organ in the 2nd-instar Choristoneura fumiferana (Clemens). The germinal cysts exhibit synchronized differentiation until the 3rd instar, after which differentiation becomes asynchronous. Second and 3rd instars contain spermatogonia; 4th instars have mainly primary spermatocytes in the pachytene stage; 5th instars contain mostly secondary spermatocytes; 6th instars contain all stages, but most of the cells belong to the spermatid stage; pupal and adult testes contain mostly spermatozoa. The paired larval testes coalesce during the pharate pupal stage to give rise to the unpaired adult testis. The correlation between germ cell differentiation and morphogenesis and its use in sterilization studies is discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
