Fig. 2

The two co-occurring hermit crab species and the four most commonly utilized gastropod shell types. On the top, the two tested hermit crab species, Coenobita rugosus (a) and C. perlatus (b) and below the four different shell types utilized, i.e. nassariid (c; here depicted: Nassarius variciferus), naticid (d; here depicted Polinices mammilla), cerithiid (e; here depicted Rhinoclavis aspera) and strombid shells (f; here depicted Gibberulus gibberulus)