Naples, Mergellina, along the jetty of Via Caracciolo and Porticciolo di Mergellina (geocoordinates not provided, but estimated with gazetteer to be lat. 40.831902º, long. 14.233419º); rocky substrate covered with algae, maily Cystoseira sp. and Gelidium sp., with Enteromorpha sp., Dictyota sp., Ceramium sp., and Corallina sp.; intertidal to 2 m