Grasshopper Testis
Invertebrate Spermatogenesis
Examine the slide of the grasshopper testis and look for a longitudinal section (l.s.) of a lobe.  Note that the spermatogonia (immature cells) are at one end and the spermatozoa (mature sperm) are at the opposite end of the lobe.

Switch to higher magnification and examine the lobe to identify the stages of spermatogenesis.
Notice that the size difference between the primary spermatocyte (1) and the secondary spermatocyte (2).

       

Examine the end of the lobe where the spermatozoa are located.  Notice that the spermatids (4a) undergo spermiogenesis to produce spermatozoa (4b)