Figure 341 from Chapter 14 (Sperm Flagellum) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. Cross sections of spermatozoa in the testis of a moth. The flagellar membrane of many Lepidoptran spermatozoa is decorated by radiating projections with a highly periodic structure. Image by David Phillips. A PDF copy of the accompanying chapter is available on the ASCB's BioEDUCATE website.