M. Lezzi, F. Cardone, B. Mikac, and A. Giangrande, “Variation and ontogenetic changes of opercular paleae in a population of Sabellaria spinulosa (Polychaeta: Sabellaridae) from the South Adriatic Sea, with remarks on larval development”, Sci. mar., vol. 79, no. 1, pp. 137–150, Mar. 2015.