Lepore, Elena, Margherita Sciscioli, Maria Mastrodonato, Miriam Gherardi, Adriana Giangrande, and Luigi Musco. 2006. “Sperm Ultra-Structure and Spermiogenesis in Syllis Krohni (Polychaeta: Syllidae), With Some Observations on Its Reproductive Biology”. Scientia Marina 70 (4):585-92. https://doi.org/10.3989/scimar.2006.70n4585.