Male Infertility Due to Acephalic Spermatozoa, also known as acephalic spermatozoa syndrome, is related to spermatogenic failure 21 and male infertility. An important gene associated with Male Infertility Due to Acephalic Spermatozoa is SUN5 (Sad1 And UNC84 Domain Containing 5). Related phenotypes are male infertility and acephalic spermatozoa