“…Most marine gastropods are gonochoric and the majority of sexual selection studies have been carried out on species in the family Littorinidae (Erlandsson & Johannesson, 1994;Erlandsson & Rolán-Alvarez, 1998;Johannesson et al, 2016;Ng & Williams, 2014;Rolán-Alvarez & Ekendahl, 1996;Saur, 1990;Zahradnik, Lemay, & Boulding, 2008); probably as a result of their wide distribution, high abundance (Reid, 1989;Rolán-Alvarez, Austin, & Boulding, 2015) and the fact that sexes can be readily identified (Reid, 1986(Reid, , 1989. There have, however, also been studies on Neptunea arthritica (Lombardo & Goshima, 2010, 2011Lombardo, Takeshita, Abe, & Goshima, 2012) and Rapana venosa (Xue, Zhang, & Liu, 2016) as well as studies on sexual selection on size in several other species (Table 1).…”