By its division are formed two secondary spermatocytes, each of which give rise to two spermatids (Wilson).
"Explanation of Terms Used in Entomology" by John. B. Smith
Various stages in the development of the spermatid are seen in figures 200 to 203.
"Studies in Spermatogenesis (Part 1 of 2)" by Nettie Maria Stevens
Figure 79 is a very young spermatid showing only diffuse chromatin in the nucleus.
"Studies in Spermatogenesis" by Nettie Maria Stevens
Each spermatid becomes a functional spermatozoon or male gamete.
"Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3" by Various
Secondary spermatocytes are still evident near the periphery of the tubules but they are much less numerous than spermatids.
"Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz" by John M. Legler