Lepore, E., Sciscioli, M., Mastrodonato, M., Gherardi, M., Giangrande, A. and Musco, L. 2006. Sperm ultra-structure and spermiogenesis in Syllis krohni (Polychaeta: Syllidae), with some observations on its reproductive biology. Scientia Marina. 70, 4 (Dec. 2006), 585–592. DOI:https://doi.org/10.3989/scimar.2006.70n4585.